Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.os.linux.misc > #78549 > unrolled thread
| Started by | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| First post | 2025-12-09 10:47 +0000 |
| Last post | 2025-12-24 22:53 +0000 |
| Articles | 20 on this page of 99 — 13 participants |
Back to article view | Back to comp.os.linux.misc
More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-09 10:47 +0000
Re: More on wifi range - Pi PICO W Oil level sensor Andy Burns <usenet@andyburns.uk> - 2025-12-09 11:57 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-09 14:07 +0000
Re: More on wifi range - Pi PICO W Oil level sensor Rich <rich@example.invalid> - 2025-12-09 19:14 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-09 19:17 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-09 21:19 -0500
Re: More on wifi range - Pi PICO W Oil level sensor Andy Burns <usenet@andyburns.uk> - 2025-12-10 05:18 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-10 00:27 -0500
Re: More on wifi range - Pi PICO W Oil level sensor Andy Burns <usenet@andyburns.uk> - 2025-12-10 05:38 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-10 02:13 -0500
Re: More on wifi range - Pi PICO W Oil level sensor Andy Burns <usenet@andyburns.uk> - 2025-12-10 08:12 +0000
Re: More on wifi range - Pi PICO W Oil level sensor Andy Burns <usenet@andyburns.uk> - 2025-12-10 08:15 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-10 03:56 -0500
Re: More on wifi range - Pi PICO W Oil level sensor Andy Burns <usenet@andyburns.uk> - 2025-12-10 09:14 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-10 09:59 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-10 05:02 -0500
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-10 10:24 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-10 05:53 -0500
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-10 11:45 +0000
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-11 22:06 +0100
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-12 10:26 +0000
Re: More on wifi range - Pi PICO W Oil level sensor Andy Burns <usenet@andyburns.uk> - 2025-12-12 10:39 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-12 11:14 +0000
Re: More on wifi range - Pi PICO W Oil level sensor Andy Burns <usenet@andyburns.uk> - 2025-12-12 11:41 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-12 12:10 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-13 01:19 -0500
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-12 12:19 +0100
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-12 12:10 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-12 23:42 -0500
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-13 13:30 +0100
Re: More on wifi range - Pi PICO W Oil level sensor Fritz Wuehler <fritz@spamexpire-202512.rodent.frell.theremailer.net> - 2025-12-14 19:23 +0100
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-15 01:55 -0500
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-15 17:49 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-16 01:50 -0500
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-16 10:43 +0000
Re: More on wifi range - Pi PICO W Oil level sensor rbowman <bowman@montana.com> - 2025-12-16 20:40 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-17 01:05 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-17 01:55 -0500
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-17 10:31 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-17 06:25 -0500
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-18 19:00 +0100
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-19 00:55 -0500
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-19 15:16 +0100
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-20 03:26 -0500
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-20 13:00 +0100
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-17 00:20 -0500
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-17 01:01 -0500
Re: More on wifi range - Pi PICO W Oil level sensor rbowman <bowman@montana.com> - 2025-12-15 23:45 +0000
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-16 23:31 +0100
Re: More on wifi range - Pi PICO W Oil level sensor Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-12-16 16:35 -0800
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-17 01:38 -0500
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-17 01:20 -0500
Re: More on wifi range - Pi PICO W Oil level sensor rbowman <bowman@montana.com> - 2025-12-17 07:58 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-17 03:24 -0500
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-17 20:39 +0100
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-15 17:46 +0000
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-11 22:03 +0100
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-10 09:57 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-10 09:55 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-10 05:36 -0500
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-10 11:33 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-10 09:47 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-10 05:29 -0500
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-10 11:29 +0000
Re: More on wifi range - Pi PICO W Oil level sensor Daniel James <daniel@me.invalid> - 2025-12-10 13:01 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-10 13:05 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-10 23:19 -0500
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-10 23:12 -0500
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-11 08:48 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-11 04:19 -0500
Cable chasing (Was: More on wifi range - Pi PICO W Oil level sensor) Daniel James <daniel@me.invalid> - 2025-12-11 10:15 +0000
Inside out (Was: More on wifi range - Pi PICO W Oil level sensor) Daniel James <daniel@me.invalid> - 2025-12-11 10:23 +0000
Re: Inside out (Was: More on wifi range - Pi PICO W Oil level sensor) Lars Poulsen <lars@beagle-ears.com> - 2025-12-11 18:16 +0000
Re: Inside out (Was: More on wifi range - Pi PICO W Oil level sensor) John R Walliker <jrwalliker@gmail.com> - 2025-12-11 18:28 +0000
Re: Inside out (Was: More on wifi range - Pi PICO W Oil level sensor) "Carlos E.R." <robin_listas@es.invalid> - 2025-12-11 21:59 +0100
Re: Inside out (Was: More on wifi range - Pi PICO W Oil level sensor) The Natural Philosopher <tnp@invalid.invalid> - 2025-12-12 11:21 +0000
Re: Inside out (Was: More on wifi range - Pi PICO W Oil level sensor) "Carlos E.R." <robin_listas@es.invalid> - 2025-12-13 13:45 +0100
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-11 22:18 +0100
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-12 10:41 +0000
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-13 13:57 +0100
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-12 11:28 +0000
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-13 13:56 +0100
Re: More on wifi range - Pi PICO W Oil level sensor John R Walliker <jrwalliker@gmail.com> - 2025-12-14 19:22 +0000
Re: More on wifi range - Pi PICO W Oil level sensor mm0fmf <none@invalid.com> - 2025-12-24 07:58 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-24 12:16 +0000
Re: More on wifi range - Pi PICO W Oil level sensor John R Walliker <jrwalliker@gmail.com> - 2025-12-24 14:04 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-24 14:23 +0000
Re: More on wifi range - Pi PICO W Oil level sensor "Kerr-Mudd, John" <admin@127.0.0.1> - 2025-12-24 17:00 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-24 20:07 +0000
Re: More on wifi range - Pi PICO W Oil level sensor mm0fmf <none@invalid.com> - 2025-12-24 23:17 +0000
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-25 03:23 +0000
Re: More on wifi range - Pi PICO W Oil level sensor rbowman <bowman@montana.com> - 2025-12-25 07:32 +0000
Re: More on wifi range - Pi PICO W Oil level sensor c186282 <c186282@nnada.net> - 2025-12-24 21:16 -0500
Re: More on wifi range - Pi PICO W Oil level sensor "Carlos E.R." <robin_listas@es.invalid> - 2025-12-27 21:51 +0100
Re: More on wifi range - Pi PICO W Oil level sensor The Natural Philosopher <tnp@invalid.invalid> - 2025-12-27 23:31 +0000
Re: More on wifi range - Pi PICO W Oil level sensor rbowman <bowman@montana.com> - 2025-12-27 23:58 +0000
Re: More on wifi range - Pi PICO W Oil level sensor Lars Poulsen <lars@beagle-ears.com> - 2025-12-24 23:01 +0000
Re: More on wifi range - Pi PICO W Oil level sensor rbowman <bowman@montana.com> - 2025-12-25 02:29 +0000
Re: More on wifi range - Pi PICO W Oil level sensor Lars Poulsen <lars@beagle-ears.com> - 2025-12-24 22:53 +0000
Page 2 of 5 — ← Prev page 1 [2] 3 4 5 Next page →
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2025-12-12 10:26 +0000 |
| Message-ID | <10hgqju$2r3rh$1@dont-email.me> |
| In reply to | #78834 |
On 11/12/2025 21:06, Carlos E.R. wrote: > On 2025-12-10 11:24, The Natural Philosopher wrote: >> On 10/12/2025 10:02, c186282 wrote: >>> On 12/10/25 04:14, Andy Burns wrote: >>>> c186282 wrote: >>>> >>>>> I think it was you ... said how a cam would >>>>> more or less drop out when the Big Red Truck >>>>> was there. >>>> No, maybe TNP said his oil level monitor would drop out? >>> >>> Posting traffic has considerably increased of late, >>> partly my "fault" ... but COSLM was kind of dying >>> and that would have been tragic. Forgive the sort >>> of off-topic stuff, but it DOES keep minds alive - >>> you can't ALWAYS think about Linux without kind >>> of seizing up :-) >>> >> I stated for te record and for the interest of others doing outside >> wifi coupled IOT shit that rain wind and possibly cars made a difference. >> >> Someone else remarked that so did fire trucks. >> >> The downside of the new oil monitor is that is is so accurate - to >> within a litre it seems - that I can visibly see how much a shower or >> washing the dishes costs me, and a cold night is very expensive. :-) >> LOL. >> >> Now off to write the software that will look at it for me and warn me >> of things by email. >> So I can get on with the next project. > > You mentioned thieves stealing fuel. You can also monitor for that. You > would need a fuel flow meter on the fuel line, or a sensor telling when > the furnace is working. Compare with the tank level decreasing rapidly. > The problem is that the sensor I built on the tank has no power except batteries: So it only wakes up occasionally and draws nanoamps in between. I have completed the warning software that looks for low oil levels, loss of communication, a failing battery and unexpected changes in oil level, BUT it cannot do that in real time as the unit is only powered up for a minute or so every couple of hours. Depending on how long the batteries last I may increase the frequency of operation. But it can never be 'real time' -- If you tell a lie big enough and keep repeating it, people will eventually come to believe it. The lie can be maintained only for such time as the State can shield the people from the political, economic and/or military consequences of the lie. It thus becomes vitally important for the State to use all of its powers to repress dissent, for the truth is the mortal enemy of the lie, and thus by extension, the truth is the greatest enemy of the State. Joseph Goebbels
[toc] | [prev] | [next] | [standalone]
| From | Andy Burns <usenet@andyburns.uk> |
|---|---|
| Date | 2025-12-12 10:39 +0000 |
| Message-ID | <mq29n8Fkbm0U1@mid.individual.net> |
| In reply to | #78892 |
The Natural Philosopher wrote: > the sensor I built on the tank has no power except batteries: So it only > wakes up occasionally and draws nanoamps in between. > I have completed the warning software that looks for low oil levels, > loss of communication, a failing battery and unexpected changes in oil > level, BUT it cannot do that in real time as the unit is only powered up > for a minute or so every couple of hours. > > Depending on how long the batteries last I may increase the frequency of > operation. Worth trying to send the data as UDP rather than TCP? if it fits in a single packet,the receiver doesn't have to track the position within a stream ...
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2025-12-12 11:14 +0000 |
| Message-ID | <10hgtem$2r3rh$8@dont-email.me> |
| In reply to | #78895 |
On 12/12/2025 10:39, Andy Burns wrote: > The Natural Philosopher wrote: > >> the sensor I built on the tank has no power except batteries: So it >> only wakes up occasionally and draws nanoamps in between. >> I have completed the warning software that looks for low oil levels, >> loss of communication, a failing battery and unexpected changes in oil >> level, BUT it cannot do that in real time as the unit is only powered >> up for a minute or so every couple of hours. >> >> Depending on how long the batteries last I may increase the frequency >> of operation. > > > Worth trying to send the data as UDP rather than TCP? if it fits in a > single packet,the receiver doesn't have to track the position within a > stream ... > > Well the daemon runs under xinetd...for sheer laziness. I guess I could make it UDP. But I don't know what problem that would solve. -- Microsoft : the best reason to go to Linux that ever existed.
[toc] | [prev] | [next] | [standalone]
| From | Andy Burns <usenet@andyburns.uk> |
|---|---|
| Date | 2025-12-12 11:41 +0000 |
| Message-ID | <mq2dc2FktbjU2@mid.individual.net> |
| In reply to | #78903 |
The Natural Philosopher wrote: > Well the daemon runs under xinetd...for sheer laziness. I guess I could > make it UDP. > > But I don't know what problem that would solve. The data would arrive if a single packet got through the fog, whereas with tcp at least dour packets on sequence need to make it (or get retried) with UDP you could afford to spray each packet half a dozen times and if one of them makes it, you're good ...
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2025-12-12 12:10 +0000 |
| Message-ID | <10hh0oj$2r3rh$25@dont-email.me> |
| In reply to | #78913 |
On 12/12/2025 11:41, Andy Burns wrote: > The Natural Philosopher wrote: > >> Well the daemon runs under xinetd...for sheer laziness. I guess I >> could make it UDP. >> >> But I don't know what problem that would solve. > > The data would arrive if a single packet got through the fog, whereas > with tcp at least dour packets on sequence need to make it (or get > retried) with UDP you could afford to spray each packet half a dozen > times and if one of them makes it, you're good ... > > > Oh, ok... -- “The ultimate result of shielding men from the effects of folly is to fill the world with fools.” Herbert Spencer
[toc] | [prev] | [next] | [standalone]
| From | c186282 <c186282@nnada.net> |
|---|---|
| Date | 2025-12-13 01:19 -0500 |
| Message-ID | <Gp2cnVMsbIP3mKD0nZ2dnZfqn_ednZ2d@giganews.com> |
| In reply to | #78913 |
On 12/12/25 06:41, Andy Burns wrote: > The Natural Philosopher wrote: > >> Well the daemon runs under xinetd...for sheer laziness. I guess I >> could make it UDP. >> >> But I don't know what problem that would solve. > > The data would arrive if a single packet got through the fog, whereas > with tcp at least dour packets on sequence need to make it (or get > retried) with UDP you could afford to spray each packet half a dozen > times and if one of them makes it, you're good ... I once made a bi-directional client/server setup, first Python, then 'C'. One variant was TCP, the other UDP. Probably could have used a config file or defs ... but I never got to it. On a clean LAN, both worked perfectly. However with some outdoor devices (Pi2 + wifi dongle as best I recall) both approaches had issues kind of similar to what you described. TCP, while "error resistant", was often VERY iffy. UDP - well - easier/smaller to send. You could scan each packet for obvious errors and, if a fail, could ask for it again or just let the pgm work around to sending that data again. For almost all modern apps, TCP is best by far. However iffy situations CAN still exist, so UDP you add some IQ to MIGHT be better. As I've said elsewhere, wifi can sometimes be black magic. Weird RF shadows and multipaths can be anywhere and it's very hard to tell what's perfect placement. Hmm ... apparently CANbus can be sent over wifi - but you lose some error-checking so there's no gain. There are various dongles for lower-freq data transmission too, but never got around to trying them. Fidelity might be worth losing some speed.
[toc] | [prev] | [next] | [standalone]
| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2025-12-12 12:19 +0100 |
| Message-ID | <7bat0mxbob.ln2@Telcontar.valinor> |
| In reply to | #78892 |
On 2025-12-12 11:26, The Natural Philosopher wrote: > On 11/12/2025 21:06, Carlos E.R. wrote: >> On 2025-12-10 11:24, The Natural Philosopher wrote: >>> On 10/12/2025 10:02, c186282 wrote: >>>> On 12/10/25 04:14, Andy Burns wrote: >>>>> c186282 wrote: >>> Now off to write the software that will look at it for me and warn me >>> of things by email. >>> So I can get on with the next project. >> >> You mentioned thieves stealing fuel. You can also monitor for that. >> You would need a fuel flow meter on the fuel line, or a sensor telling >> when the furnace is working. Compare with the tank level decreasing >> rapidly. >> > > The problem is that the sensor I built on the tank has no power except > batteries: So it only wakes up occasionally and draws nanoamps in between. > I have completed the warning software that looks for low oil levels, > loss of communication, a failing battery and unexpected changes in oil > level, BUT it cannot do that in real time as the unit is only powered up > for a minute or so every couple of hours. > > Depending on how long the batteries last I may increase the frequency of > operation. But it can never be 'real time' Ah. What about a small solar panel and rechargeable batteries? -- Cheers, Carlos. ES🇪🇸, EU🇪🇺;
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2025-12-12 12:10 +0000 |
| Message-ID | <10hh0mr$2r3rh$24@dont-email.me> |
| In reply to | #78907 |
On 12/12/2025 11:19, Carlos E.R. wrote: > On 2025-12-12 11:26, The Natural Philosopher wrote: >> On 11/12/2025 21:06, Carlos E.R. wrote: >>> On 2025-12-10 11:24, The Natural Philosopher wrote: >>>> On 10/12/2025 10:02, c186282 wrote: >>>>> On 12/10/25 04:14, Andy Burns wrote: >>>>>> c186282 wrote: > > >>>> Now off to write the software that will look at it for me and warn >>>> me of things by email. >>>> So I can get on with the next project. >>> >>> You mentioned thieves stealing fuel. You can also monitor for that. >>> You would need a fuel flow meter on the fuel line, or a sensor >>> telling when the furnace is working. Compare with the tank level >>> decreasing rapidly. >>> >> >> The problem is that the sensor I built on the tank has no power except >> batteries: So it only wakes up occasionally and draws nanoamps in >> between. >> I have completed the warning software that looks for low oil levels, >> loss of communication, a failing battery and unexpected changes in oil >> level, BUT it cannot do that in real time as the unit is only powered >> up for a minute or so every couple of hours. >> >> Depending on how long the batteries last I may increase the frequency >> of operation. But it can never be 'real time' > > Ah. > > What about a small solar panel and rechargeable batteries? > Yes. That is in the 'lemme think about that' pile... Not that there is much sun here.. At this time of year. And where the tank it is likely to get overgrown or shat on by birds -- “The ultimate result of shielding men from the effects of folly is to fill the world with fools.” Herbert Spencer
[toc] | [prev] | [next] | [standalone]
| From | c186282 <c186282@nnada.net> |
|---|---|
| Date | 2025-12-12 23:42 -0500 |
| Message-ID | <Gp2cnVEsbIMuc6H0nZ2dnZfqn_ednZ2d@giganews.com> |
| In reply to | #78907 |
On 12/12/25 06:19, Carlos E.R. wrote: > On 2025-12-12 11:26, The Natural Philosopher wrote: >> On 11/12/2025 21:06, Carlos E.R. wrote: >>> On 2025-12-10 11:24, The Natural Philosopher wrote: >>>> On 10/12/2025 10:02, c186282 wrote: >>>>> On 12/10/25 04:14, Andy Burns wrote: >>>>>> c186282 wrote: > > >>>> Now off to write the software that will look at it for me and warn >>>> me of things by email. >>>> So I can get on with the next project. >>> >>> You mentioned thieves stealing fuel. You can also monitor for that. >>> You would need a fuel flow meter on the fuel line, or a sensor >>> telling when the furnace is working. Compare with the tank level >>> decreasing rapidly. >>> >> >> The problem is that the sensor I built on the tank has no power except >> batteries: So it only wakes up occasionally and draws nanoamps in >> between. >> I have completed the warning software that looks for low oil levels, >> loss of communication, a failing battery and unexpected changes in oil >> level, BUT it cannot do that in real time as the unit is only powered >> up for a minute or so every couple of hours. >> >> Depending on how long the batteries last I may increase the frequency >> of operation. But it can never be 'real time' > > Ah. > > What about a small solar panel and rechargeable batteries? Seeed sells the "LiPo Rider Plus". After checking several brands of 'solar charge controllers' these were the ones I chose to power my field projects. Most of the others did NOT cap the voltage very well, or at all, so the sun comes out bright and you might send 6+ into your 3.1v device. Combined with a 3 to 5 watt panel they'll keep even intermittent non-nano-power projects going. Beware the quality of the batteries though ... got some no-names, about 50x50x10mm square, that were generally good - but one DID explode on me, inside the office building, when I barely touched it. Had not been charged for months either. Oh well, nothing to do but watch the big crimson flame ....... Fire control IS a priority with lithiums.
[toc] | [prev] | [next] | [standalone]
| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2025-12-13 13:30 +0100 |
| Message-ID | <es201mxcdp.ln2@Telcontar.valinor> |
| In reply to | #78961 |
On 2025-12-13 05:42, c186282 wrote: > On 12/12/25 06:19, Carlos E.R. wrote: >> On 2025-12-12 11:26, The Natural Philosopher wrote: >>> On 11/12/2025 21:06, Carlos E.R. wrote: >>>> On 2025-12-10 11:24, The Natural Philosopher wrote: >>>>> On 10/12/2025 10:02, c186282 wrote: >>>>>> On 12/10/25 04:14, Andy Burns wrote: >> What about a small solar panel and rechargeable batteries? > > > Seeed sells the "LiPo Rider Plus". After checking > several brands of 'solar charge controllers' these > were the ones I chose to power my field projects. > Most of the others did NOT cap the voltage very > well, or at all, so the sun comes out bright and you > might send 6+ into your 3.1v device. > > Combined with a 3 to 5 watt panel they'll keep even > intermittent non-nano-power projects going. > > Beware the quality of the batteries though ... got > some no-names, about 50x50x10mm square, that were > generally good - but one DID explode on me, inside > the office building, when I barely touched it. Had > not been charged for months either. Oh well, nothing > to do but watch the big crimson flame ....... > > Fire control IS a priority with lithiums. > Huh. That's not good when the thing is intended to be near a oil tank. -- Cheers, Carlos. ES🇪🇸, EU🇪🇺;
[toc] | [prev] | [next] | [standalone]
| From | Fritz Wuehler <fritz@spamexpire-202512.rodent.frell.theremailer.net> |
|---|---|
| Date | 2025-12-14 19:23 +0100 |
| Message-ID | <4795ac3fd5ad1428f38c093b2b1543ca@msgid.frell.theremailer.net> |
| In reply to | #78834 |
The Natural Philosopher <...@invalid.invalid> [TNP]: TNP> Depending on how long the batteries last I may increase the TNP> frequency of operation. But it can never be 'real time' Have you considered using a couple of old 12V car/motorcycle batteries (one at a time) instead?
[toc] | [prev] | [next] | [standalone]
| From | c186282 <c186282@nnada.net> |
|---|---|
| Date | 2025-12-15 01:55 -0500 |
| Message-ID | <ZB6cnXUwSuxwLaL0nZ2dnZfqnPadnZ2d@giganews.com> |
| In reply to | #79087 |
On 12/14/25 13:23, Fritz Wuehler wrote: > The Natural Philosopher <...@invalid.invalid> [TNP]: > TNP> Depending on how long the batteries last I may increase the > TNP> frequency of operation. But it can never be 'real time' > > Have you considered using a couple of old 12V car/motorcycle batteries > (one at a time) instead? Those are BIG (and heavy and need special recharge). At least they don't detonate like Li-Ion batts. Had a weather station that used up batteries too fast. Wanted to convert it to solar charge with a small lead battery - 6v. Well, first you needed a 9-12v solar panel, easy enough, but then a converter to get that into the range a dedicated lead/acid charger could cope with AND the charger could NOT cause the circuit to see any more than 6v regardless of sun levels. Turned into a MESS. Solution ... 9v little solar, a resistor bridge to drop to about 6.5v and a 10w zener to suck up any over-voltage across the device power leads. The batt just got a small harmless 'trickle charge' which was enough to deal. Less tech = MORE in this case. IF the poster has made something with "nano-power" parts (easily had but most are meant to be used with automated assembly machinery/methods) then even a couple of non-recharable lithium batts ought to be OK. THESE days, looks like you can just send a Gerber file or equiv to a board-making outfit and they will produce even one-off assemblies for a (semi) affordable price. The humans do nothing, the machine does all the work. Doesn't care WHAT or how many. In his app, does he even NEED "real time" ? "Close Enough" may be Good Enough perhaps. Again, we tend to get hung up on the decimal places even when "ball park" is adequate for the particular need.
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2025-12-15 17:49 +0000 |
| Message-ID | <10hphmm$22juh$3@dont-email.me> |
| In reply to | #79138 |
On 15/12/2025 06:55, c186282 wrote: > In his app, does he even NEED "real time" ? > "Close Enough" may be Good Enough perhaps. No,m I get a report every two hours I did design my own PCBs I have a nano timer that reboots the board every 2 hours and then the pi shuts itself off again. -- "A point of view can be a dangerous luxury when substituted for insight and understanding". Marshall McLuhan
[toc] | [prev] | [next] | [standalone]
| From | c186282 <c186282@nnada.net> |
|---|---|
| Date | 2025-12-16 01:50 -0500 |
| Message-ID | <NWednR3tSZOpnNz0nZ2dnZfqnPadnZ2d@giganews.com> |
| In reply to | #79162 |
On 12/15/25 12:49, The Natural Philosopher wrote: > On 15/12/2025 06:55, c186282 wrote: >> In his app, does he even NEED "real time" ? >> "Close Enough" may be Good Enough perhaps. > > No,m I get a report every two hours So seven milliseconds is CRITICAL obviously :-) > I did design my own PCBs I've done a number from scratch ... photo-masks, evil chemicals, the whole bit. SOME use XYZ mini-routers to literally machine-out copper from boards. Ugly, but DOES work for many applications. > I have a nano timer that reboots the board every 2 hours and then the pi > shuts itself off again. I have a few PIs that just use crontab to reboot once/twice/thrice a day. Working on cleaning up the app that clutters/slows them down. Found some of the problems. Now STARTING a Pi from scratch a few times a day, THEN you need an external timer device. Microcontrollers, most have low-power libraries that 99.99% shut 'em down until there's an interrupt, perhaps from a time chip. PIs however - they're natural power hogs ... NOT good for battery/solar operation. I used a lot of Ard 2560s for solar field devices. They have low-power libs and reduce to seriously low current draw. DID slice the traces out of the cheapo time chip on the board and used "ChronoDots" instead. Interrupt, and it all comes back to life. Oh, where an oSillyScope is a good thing ... had an odd issue where the board would reset for no obvious reason. Turned out I'd attached the time chip to a current-limited line ALSO shared by an external device. The device didn't use much power EXCEPT for maybe a sub-millisecond when it powered up. Probably caps charging. FOUND that deadly voltage dip with a scope, little else would have. Had kept looking for a software problem, but ...
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2025-12-16 10:43 +0000 |
| Message-ID | <10hrd3p$2i9gm$7@dont-email.me> |
| In reply to | #79265 |
On 16/12/2025 06:50, c186282 wrote: > On 12/15/25 12:49, The Natural Philosopher wrote: >> On 15/12/2025 06:55, c186282 wrote: >>> In his app, does he even NEED "real time" ? >>> "Close Enough" may be Good Enough perhaps. >> >> No,m I get a report every two hours > > So seven milliseconds is CRITICAL obviously :-) > LOL >> I did design my own PCBs > > I've done a number from scratch ... photo-masks, > evil chemicals, the whole bit. > It was cheaper to send the files to china than buy the kit.. https://dirtypcbs.com Back in about 10 days at silly prices. > SOME use XYZ mini-routers to literally machine-out > copper from boards. Ugly, but DOES work for many > applications. > Ah. Mr Usagi. Some use 3D printers to deposit low melting point solder as well We use what we have to hand. I use cCorel draw. There is an online facility that turns that into the right format for PCB manufaturers. >> I have a nano timer that reboots the board every 2 hours and then the >> pi shuts itself off again. > > I have a few PIs that just use crontab to > reboot once/twice/thrice a day. Working on > cleaning up the app that clutters/slows > them down. Found some of the problems. > Yes. That reminds me, I need to put the watchdog in some of my daemons too But in the case of the oil sensor clienbt this is physical 'shut off all power and stay down for two hours' Draws about 50nA in that period > Now STARTING a Pi from scratch a few times > a day, THEN you need an external timer device. > > Microcontrollers, most have low-power libraries > that 99.99% shut 'em down until there's an interrupt, > perhaps from a time chip. PIs however - they're > natural power hogs ... NOT good for battery/solar > operation. > Looked at all that. Not good enough. I was going to build a CMOS timer then I stumbled across the TP1550 chip. liitle 'breakout' boards were dirt cheap > I used a lot of Ard 2560s for solar field devices. > They have low-power libs and reduce to seriously > low current draw. DID slice the traces out of > the cheapo time chip on the board and used > "ChronoDots" instead. Interrupt, and it all > comes back to life. > > Oh, where an oSillyScope is a good thing ... had > an odd issue where the board would reset for no > obvious reason. Turned out I'd attached the time > chip to a current-limited line ALSO shared by an > external device. The device didn't use much power > EXCEPT for maybe a sub-millisecond when it powered > up. Probably caps charging. FOUND that deadly > voltage dip with a scope, little else would have. > Had kept looking for a software problem, but ... > I used my sillyscope to see why the *!%$£ things was oscillating under power. turned out to need serious capacitance on the output to stop the wrong sort of feedback triggering it -- "And if the blind lead the blind, both shall fall into the ditch". Gospel of St. Mathew 15:14
[toc] | [prev] | [next] | [standalone]
| From | rbowman <bowman@montana.com> |
|---|---|
| Date | 2025-12-16 20:40 +0000 |
| Message-ID | <mqduehFiccvU9@mid.individual.net> |
| In reply to | #79276 |
On Tue, 16 Dec 2025 10:43:05 +0000, The Natural Philosopher wrote: > On 16/12/2025 06:50, c186282 wrote: >> On 12/15/25 12:49, The Natural Philosopher wrote: >>> On 15/12/2025 06:55, c186282 wrote: >>>> In his app, does he even NEED "real time" ? >>>> "Close Enough" may be Good Enough perhaps. >>> >>> No,m I get a report every two hours >> >> So seven milliseconds is CRITICAL obviously >> > LOL > > >>> I did design my own PCBs >> >> I've done a number from scratch ... photo-masks, >> evil chemicals, the whole bit. >> > It was cheaper to send the files to china than buy the kit.. I wish I had that option back in the '70s. Doing the art work, creating the silk screens, etching, and drilling was a pain in the ass. Fortunately I hired an older woman who knew more about the etching part than I did and a lesbian who was happy to stand in front of a Bridgeport punching holes. I got funny looks from the management since it was an all male shop except for the front office but they weren't DEI hires. They were the best candidates for the positions.
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2025-12-17 01:05 +0000 |
| Message-ID | <10hsvk3$35lln$4@dont-email.me> |
| In reply to | #79312 |
On 16/12/2025 20:40, rbowman wrote: > On Tue, 16 Dec 2025 10:43:05 +0000, The Natural Philosopher wrote: > >> On 16/12/2025 06:50, c186282 wrote: >>> On 12/15/25 12:49, The Natural Philosopher wrote: >>>> On 15/12/2025 06:55, c186282 wrote: >>>>> In his app, does he even NEED "real time" ? >>>>> "Close Enough" may be Good Enough perhaps. >>>> >>>> No,m I get a report every two hours >>> >>> So seven milliseconds is CRITICAL obviously >>> >> LOL >> >> >>>> I did design my own PCBs >>> >>> I've done a number from scratch ... photo-masks, >>> evil chemicals, the whole bit. >>> >> It was cheaper to send the files to china than buy the kit.. > > I wish I had that option back in the '70s. Doing the art work, creating > the silk screens, etching, and drilling was a pain in the ass. Fortunately > I hired an older woman who knew more about the etching part than I did and > a lesbian who was happy to stand in front of a Bridgeport punching holes. > I got funny looks from the management since it was an all male shop except > for the front office but they weren't DEI hires. They were the best > candidates for the positions. Back in the 1970s I worked for companies that could pay the rates for commercial prototypes. But I built it all on pegboard first. -- For in reason, all government without the consent of the governed is the very definition of slavery. Jonathan Swift
[toc] | [prev] | [next] | [standalone]
| From | c186282 <c186282@nnada.net> |
|---|---|
| Date | 2025-12-17 01:55 -0500 |
| Message-ID | <W1Odnb_bludDzt_0nZ2dnZfqn_ednZ2d@giganews.com> |
| In reply to | #79334 |
On 12/16/25 20:05, The Natural Philosopher wrote: > On 16/12/2025 20:40, rbowman wrote: >> On Tue, 16 Dec 2025 10:43:05 +0000, The Natural Philosopher wrote: >> >>> On 16/12/2025 06:50, c186282 wrote: >>>> On 12/15/25 12:49, The Natural Philosopher wrote: >>>>> On 15/12/2025 06:55, c186282 wrote: >>>>>> In his app, does he even NEED "real time" ? >>>>>> "Close Enough" may be Good Enough perhaps. >>>>> >>>>> No,m I get a report every two hours >>>> >>>> So seven milliseconds is CRITICAL obviously >>>> >>> LOL >>> >>> >>>>> I did design my own PCBs >>>> >>>> I've done a number from scratch ... photo-masks, >>>> evil chemicals, the whole bit. >>>> >>> It was cheaper to send the files to china than buy the kit.. >> >> I wish I had that option back in the '70s. Doing the art work, creating >> the silk screens, etching, and drilling was a pain in the ass. >> Fortunately >> I hired an older woman who knew more about the etching part than I did >> and >> a lesbian who was happy to stand in front of a Bridgeport punching holes. >> I got funny looks from the management since it was an all male shop >> except >> for the front office but they weren't DEI hires. They were the best >> candidates for the positions. > > Back in the 1970s I worked for companies that could pay the rates for > commercial prototypes. > > But I built it all on pegboard first. Mostly good ... but if it's higher-frequency circuits you can't properly proto on such a board. You need a REAL board to see if there are HF/RF cross-over and capacitance problems and such. Sometimes just slight repositioning of the traces can have large effects. Oh, wifi, had a remote PI on my network. Performance had become horrible since I got a new router+wifi. Moved it exactly FOUR INCHES plus a slight rotation the other day and the data rate went up 5X :-) Black magic ! Hmm ... may re-enable 2.4ghz on the router. The lower-freq signal seems to be kinder and gentler relative to device positioning. Yea, 2.4 is 'slower' ... but if you can barely get a 5ghz signal then that's even MORE slow ! PIs ... found an article, THINK it was about P4s, with instructions on how to put a REAL antenna on the things. Turns out they can have a VERY long range (maybe illegal in some places) with a spliced-in proper antenna. Now USA, with the recent demolition of over-fat federal agencies, NOBODY to look for your signal ! MAYbe if you're 'commercial', but Joe Average will have to be ignored. DISadvantage of really long range - you become noticed/attractive to possibly malicious neighbors. They can let something like 'hydra' run for a week and find yer PW by brute force if they want.
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2025-12-17 10:31 +0000 |
| Message-ID | <10hu0ps$3dela$2@dont-email.me> |
| In reply to | #79358 |
On 17/12/2025 06:55, c186282 wrote: > On 12/16/25 20:05, The Natural Philosopher wrote: >> On 16/12/2025 20:40, rbowman wrote: >>> On Tue, 16 Dec 2025 10:43:05 +0000, The Natural Philosopher wrote: >>> >>>> On 16/12/2025 06:50, c186282 wrote: >>>>> On 12/15/25 12:49, The Natural Philosopher wrote: >>>>>> On 15/12/2025 06:55, c186282 wrote: >>>>>>> In his app, does he even NEED "real time" ? >>>>>>> "Close Enough" may be Good Enough perhaps. >>>>>> >>>>>> No,m I get a report every two hours >>>>> >>>>> So seven milliseconds is CRITICAL obviously >>>>> >>>> LOL >>>> >>>> >>>>>> I did design my own PCBs >>>>> >>>>> I've done a number from scratch ... photo-masks, >>>>> evil chemicals, the whole bit. >>>>> >>>> It was cheaper to send the files to china than buy the kit.. >>> >>> I wish I had that option back in the '70s. Doing the art work, creating >>> the silk screens, etching, and drilling was a pain in the ass. >>> Fortunately >>> I hired an older woman who knew more about the etching part than I >>> did and >>> a lesbian who was happy to stand in front of a Bridgeport punching >>> holes. >>> I got funny looks from the management since it was an all male shop >>> except >>> for the front office but they weren't DEI hires. They were the best >>> candidates for the positions. >> >> Back in the 1970s I worked for companies that could pay the rates for >> commercial prototypes. >> >> But I built it all on pegboard first. > > Mostly good ... but if it's higher-frequency circuits > you can't properly proto on such a board. You need a > REAL board to see if there are HF/RF cross-over and > capacitance problems and such. Sometimes just slight > repositioning of the traces can have large effects. > > Oh, wifi, had a remote PI on my network. Performance > had become horrible since I got a new router+wifi. > Moved it exactly FOUR INCHES plus a slight rotation > the other day and the data rate went up 5X :-) > > Black magic ! > Yes. The RF board got to revision 13... ... > DISadvantage of really long range - you become > noticed/attractive to possibly malicious neighbors. > They can let something like 'hydra' run for a > week and find yer PW by brute force if they want. > Nearest neighbour is outside wifi range. 250 metres or more. -- For in reason, all government without the consent of the governed is the very definition of slavery. Jonathan Swift
[toc] | [prev] | [next] | [standalone]
| From | c186282 <c186282@nnada.net> |
|---|---|
| Date | 2025-12-17 06:25 -0500 |
| Message-ID | <cZidnTxI1rOGDt_0nZ2dnZfqnPWdnZ2d@giganews.com> |
| In reply to | #79369 |
On 12/17/25 05:31, The Natural Philosopher wrote: > On 17/12/2025 06:55, c186282 wrote: >> On 12/16/25 20:05, The Natural Philosopher wrote: >>> On 16/12/2025 20:40, rbowman wrote: >>>> On Tue, 16 Dec 2025 10:43:05 +0000, The Natural Philosopher wrote: >>>> >>>>> On 16/12/2025 06:50, c186282 wrote: >>>>>> On 12/15/25 12:49, The Natural Philosopher wrote: >>>>>>> On 15/12/2025 06:55, c186282 wrote: >>>>>>>> In his app, does he even NEED "real time" ? >>>>>>>> "Close Enough" may be Good Enough perhaps. >>>>>>> >>>>>>> No,m I get a report every two hours >>>>>> >>>>>> So seven milliseconds is CRITICAL obviously >>>>>> >>>>> LOL >>>>> >>>>> >>>>>>> I did design my own PCBs >>>>>> >>>>>> I've done a number from scratch ... photo-masks, >>>>>> evil chemicals, the whole bit. >>>>>> >>>>> It was cheaper to send the files to china than buy the kit.. >>>> >>>> I wish I had that option back in the '70s. Doing the art work, creating >>>> the silk screens, etching, and drilling was a pain in the ass. >>>> Fortunately >>>> I hired an older woman who knew more about the etching part than I >>>> did and >>>> a lesbian who was happy to stand in front of a Bridgeport punching >>>> holes. >>>> I got funny looks from the management since it was an all male shop >>>> except >>>> for the front office but they weren't DEI hires. They were the best >>>> candidates for the positions. >>> >>> Back in the 1970s I worked for companies that could pay the rates for >>> commercial prototypes. >>> >>> But I built it all on pegboard first. >> >> Mostly good ... but if it's higher-frequency circuits >> you can't properly proto on such a board. You need a >> REAL board to see if there are HF/RF cross-over and >> capacitance problems and such. Sometimes just slight >> repositioning of the traces can have large effects. >> >> Oh, wifi, had a remote PI on my network. Performance >> had become horrible since I got a new router+wifi. >> Moved it exactly FOUR INCHES plus a slight rotation >> the other day and the data rate went up 5X :-) >> >> Black magic ! >> > Yes. The RF board got to revision 13... > ... Well, this was a Pi4 .... Anyway, NO other revisions ... just MOVED the thing a TINY distance and got VASTLY better performance. Just shows how iffy 5ghz wifi can be. >> DISadvantage of really long range - you become >> noticed/attractive to possibly malicious neighbors. >> They can let something like 'hydra' run for a >> week and find yer PW by brute force if they want. >> > > Nearest neighbour is outside wifi range. 250 metres or more. Lucky ! I have more nearby. At least ONE might be an asshole. I think they injected a load of NAZI bullshit into my old printer - only stopped because all the paper was used up. Getting into a printer directly like that is not dead newbie skills.
[toc] | [prev] | [next] | [standalone]
Page 2 of 5 — ← Prev page 1 [2] 3 4 5 Next page →
Back to top | Article view | comp.os.linux.misc
csiph-web