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Groups > sci.electronics.design > #453971
| From | Jasen Betts <jasen@xnet.co.nz> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Output boards, SPI vs I2C |
| Date | 2017-03-28 08:03 +0000 |
| Organization | "JJ's own news server" |
| Message-ID | <obd5dc$l1s$1@gonzo.alcatraz> (permalink) |
| References | (5 earlier) <ob8r5i$ua3$1@dont-email.me> <ob960e$p4u$1@reader1.panix.com> <obb8jp$ur3$1@dont-email.me> <obbmdn$cij$1@gonzo.alcatraz> <rk6jdcduuolspodf8ivi36sn0m4bn60etn@4ax.com> |
On 2017-03-27, Martin Riddle <martin_ridd@verizon.net> wrote: > On 27 Mar 2017 18:41:59 GMT, Jasen Betts <jasen@xnet.co.nz> wrote: > >>On 2017-03-27, rickman <gnuarm@gmail.com> wrote: >>> On 3/26/2017 3:49 PM, David Lesher wrote: >>>> rickman <gnuarm@gmail.com> writes: >>>> >>>>>> Not sure I follow; there is SPI on the board, but thinking out >>>>>> loud, we would have to add selection to the existing SPI users, >>>>>> the display, touch screen, and flash..... >>>> >>>>> Flash??? The other stuff is up to you. I"m just talking about the 24 >>>>> relays. You didn't mention the other items. Is everything going to be >>>>> on the 8 digital outputs? >>>> >>>> I was talking about using the existing I2C or SPI system to also >>>> drive the outboard relay boards. It's mentioned only in passing in the >>>> writeup. >>> >>> Yes, I saw that. I don't have the various web pages open at the moment, >>> but you may have trouble using the built in SPI port because each port >>> will need an enable. If you go this route you will need to use I2C. >> >>save some pins: use a 4017 for the enable. >> > > 74HC138 Mux, 3 to 8 yeah, almost as good. -- This email has not been checked by half-arsed antivirus software
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Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-25 02:46 +0000
Re: Output boards, SPI vs I2C krw@notreal.com - 2017-03-24 23:25 -0400
Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-26 04:13 +0000
Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-25 14:04 -0400
Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-26 04:11 +0000
Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-26 02:37 -0400
Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-26 14:41 +0000
Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-26 12:47 -0400
Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-26 19:49 +0000
Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-27 10:49 -0400
Re: Output boards, SPI vs I2C Jasen Betts <jasen@xnet.co.nz> - 2017-03-27 18:41 +0000
Re: Output boards, SPI vs I2C Martin Riddle <martin_ridd@verizon.net> - 2017-03-27 19:07 -0400
Re: Output boards, SPI vs I2C Jasen Betts <jasen@xnet.co.nz> - 2017-03-28 08:03 +0000
Re: Output boards, SPI vs I2C Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-28 10:44 -0400
Re: Output boards, SPI vs I2C Jasen Betts <jasen@xnet.co.nz> - 2017-03-28 18:59 +0000
Re: Output boards, SPI vs I2C Martin Riddle <martin_rid@verizon.net> - 2017-03-28 15:37 -0400
Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-04-03 17:49 +0000
Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-04-03 15:18 -0400
Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-04-04 02:59 +0000
Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-04-04 00:54 -0400
Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-28 05:08 +0000
Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-28 02:16 -0400
Re: Output boards, SPI vs I2C Martin Riddle <martin_ridd@verizon.net> - 2017-03-27 19:03 -0400
Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-28 03:28 +0000
Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-28 00:38 -0400
Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-28 14:47 +0000
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