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I2C relay boards.

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  I2C relay boards. David Lesher <wb8foz@panix.com> - 2017-10-26 00:33 +0000
    Re: I2C relay boards. Michael A Terrell <mike.terrell@earthlink.net> - 2017-10-26 06:22 -0400
      Re: I2C relay boards. David Lesher <wb8foz@panix.com> - 2017-10-26 15:35 +0000
        Re: I2C relay boards. Michael A Terrell <mike.terrell@earthlink.net> - 2017-10-26 13:19 -0400
          Re: I2C relay boards. David Lesher <wb8foz@panix.com> - 2017-10-27 15:43 +0000
            Re: I2C relay boards. Michael A Terrell <mike.terrell@earthlink.net> - 2017-10-27 14:12 -0400
              Re: I2C relay boards. David Lesher <wb8foz@panix.com> - 2017-10-28 05:04 +0000
                Re: I2C relay boards. Michael A Terrell <mike.terrell@earthlink.net> - 2017-10-28 06:46 -0400
                  Re: I2C relay boards. David Lesher <wb8foz@panix.com> - 2017-10-28 18:23 +0000
                    Re: I2C relay boards. rickman <gnuarm@gmail.com> - 2017-10-28 14:27 -0400
                      Re: I2C relay boards. David Lesher <wb8foz@panix.com> - 2017-10-28 18:38 +0000
                        Re: I2C relay boards. rickman <gnuarm@gmail.com> - 2017-10-28 14:51 -0400
                    Re: I2C relay boards. Michael A Terrell <mike.terrell@earthlink.net> - 2017-10-28 15:27 -0400
                      Re: I2C relay boards. rickman <gnuarm@gmail.com> - 2017-10-28 17:01 -0400
                        Re: I2C relay boards. Michael A Terrell <mike.terrell@earthlink.net> - 2017-10-28 23:43 -0400
        Re: I2C relay boards. rickman <gnuarm@gmail.com> - 2017-10-27 00:54 -0400
          Re: I2C relay boards. David Lesher <wb8foz@panix.com> - 2017-10-28 04:58 +0000

#6237 — I2C relay boards.

I have need for a 8-16 channel I2C in, relay out expansion board. 
We're now using:
<https://www.ereshop.com/shop/free/I2C-RL8xxM_SHEET.pdf> 
but the shipping is insane.

So I'm seeking an alternative supplier. I figure one approach is
to find a forum where Arduino users hang out, and ask there. 

Any suggestions for board suppliers or forums?
-- 
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

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#6240

David Lesher wrote:
> I have need for a 8-16 channel I2C in, relay out expansion board.
> We're now using:
> <https://www.ereshop.com/shop/free/I2C-RL8xxM_SHEET.pdf>
> but the shipping is insane.
>
> So I'm seeking an alternative supplier. I figure one approach is
> to find a forum where Arduino users hang out, and ask there.
>
> Any suggestions for board suppliers or forums?

PCF8574-I2C-Bidirectional-I-O-Expander-Relay-Control-SmartHome-Ardiuno-Raspberry

https://www.ebay.com/itm/282692860765	US $2.90

Used with:

/8-Eight-Channel-5V-Relay-Module-Board-with-Optocoupler-Power-Supply-PIC-ARM

https://www.ebay.com/itm/322834065204	US $6.39


gives you eight relays for $9.29 plus some wires between the modules.

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#6241

Michael A Terrell <mike.terrell@earthlink.net> writes:


>PCF8574-I2C-Bidirectional-I-O-Expander-Relay-Control-SmartHome-Ardiuno-Raspberry

>https://www.ebay.com/itm/282692860765	US $2.90

>Used with:

>/8-Eight-Channel-5V-Relay-Module-Board-with-Optocoupler-Power-Supply-PIC-ARM

>https://www.ebay.com/itm/322834065204	US $6.39

>gives you eight relays for $9.29 plus some wires between the modules.

Seen many versions of that. Want an integrated board w/relays. Found several
but all thus far are international $hipping.


-- 
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

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#6242

David Lesher wrote:
> Michael A Terrell <mike.terrell@earthlink.net> writes:
>
>
>> PCF8574-I2C-Bidirectional-I-O-Expander-Relay-Control-SmartHome-Ardiuno-Raspberry
>
>> https://www.ebay.com/itm/282692860765	US $2.90
>
>> Used with:
>
>> /8-Eight-Channel-5V-Relay-Module-Board-with-Optocoupler-Power-Supply-PIC-ARM
>
>> https://www.ebay.com/itm/322834065204	US $6.39
>
>> gives you eight relays for $9.29 plus some wires between the modules.
>
> Seen many versions of that. Want an integrated board w/relays. Found
> several but all thus far are international $hipping.


    OK, make your own. A schematic of that board is online.

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#6244

Michael A Terrell <mike.terrell@earthlink.net> writes:



>    OK, make your own. A schematic of that board is online.


Worst option. Avoiding manufacturing anything; just exponential time-sink.
Would prefer the integrated board but may end up with split approach.
-- 
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

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#6245

David Lesher wrote:
> Michael A Terrell <mike.terrell@earthlink.net> writes:
>
>
>
>>    OK, make your own. A schematic of that board is online.
>
>
> Worst option. Avoiding manufacturing anything; just exponential time-sink.
> Would prefer the integrated board but may end up with split approach.

    The split configuration would make it easier to repair, and the 
control boards can be plugged end to end. You can eliminate the jumpers 
on the headers with a drop of solder on the underside of the boards.

    If a relay board or controller board fails, it will be much cheaper 
to repair. You can buy ready made 40 conductor cables with single Dupont 
contacts on Ebay to harness them together. I remove the single contact 
shells and replace them with a single, with the proper number of 
positions. That way, my projects look a lot neater than the typical wad 
of individual wires.

    I may use a pair of these boards in a custom, multiple iron 
soldering station that I'm building.

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#6249

Michael A Terrell <mike.terrell@earthlink.net> writes:


>    The split configuration would make it easier to repair, and the 
>control boards can be plugged end to end. You can eliminate the jumpers 
>on the headers with a drop of solder on the underside of the boards.

>    If a relay board or controller board fails, it will be much cheaper 
>to repair. You can buy ready made 40 conductor cables with single Dupont 
>contacts on Ebay to harness them together. I remove the single contact 
>shells and replace them with a single, with the proper number of 
>positions. That way, my projects look a lot neater than the typical wad 
>of individual wires.

40?

I need some 10 position one-row headers but will likely use
two-row 20's and ignore the other. I do plan to plug them end
to end but will need to hold them.  Thinking a slotted /______\
piece of soft plastic that in turn is mounted to the DIN rail.

-- 
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

[toc] | [prev] | [next] | [standalone]

#6250

David Lesher wrote:
> Michael A Terrell <mike.terrell@earthlink.net> writes:
>
>
>>    The split configuration would make it easier to repair, and the
>> control boards can be plugged end to end. You can eliminate the jumpers
>> on the headers with a drop of solder on the underside of the boards.
>
>>    If a relay board or controller board fails, it will be much cheaper
>> to repair. You can buy ready made 40 conductor cables with single Dupont
>> contacts on Ebay to harness them together. I remove the single contact
>> shells and replace them with a single, with the proper number of
>> positions. That way, my projects look a lot neater than the typical wad
>> of individual wires.
>
> 40?
>
> I need some 10 position one-row headers but will likely use
> two-row 20's and ignore the other. I do plan to plug them end
> to end but will need to hold them.  Thinking a slotted /______\
> piece of soft plastic that in turn is mounted to the DIN rail.

Yes, ribbon cable. Peel off as many conductors as you need. The color 
code repeats every ten conductors.

T1-3X-40pcs-20cm-Male-To-Male-Female-Dupont-Wire-Jumper-Cable-Arduino-Breadboard

https://www.ebay.com/itm/231708399395

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#6251

Michael A Terrell <mike.terrell@earthlink.net> writes:

>> I need some 10 position one-row headers but will likely use
>> two-row 20's and ignore the other. I do plan to plug them end
>> to end but will need to hold them.  Thinking a slotted /______\
>> piece of soft plastic that in turn is mounted to the DIN rail.

>Yes, ribbon cable. Peel off as many conductors as you need. The color 
>code repeats every ten conductors.

>T1-3X-40pcs-20cm-Male-To-Male-Female-Dupont-Wire-Jumper-Cable-Arduino-Breadboard

>https://www.ebay.com/itm/231708399395


I'd rather use an IDC connector that matches the headers; less
chance something gets loose/ is misconnected.
-- 
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

[toc] | [prev] | [next] | [standalone]

#6252

David Lesher wrote on 10/28/2017 2:23 PM:
> Michael A Terrell <mike.terrell@earthlink.net> writes:
>
>>> I need some 10 position one-row headers but will likely use
>>> two-row 20's and ignore the other. I do plan to plug them end
>>> to end but will need to hold them.  Thinking a slotted /______\
>>> piece of soft plastic that in turn is mounted to the DIN rail.
>
>> Yes, ribbon cable. Peel off as many conductors as you need. The color
>> code repeats every ten conductors.
>
>> T1-3X-40pcs-20cm-Male-To-Male-Female-Dupont-Wire-Jumper-Cable-Arduino-Breadboard
>
>> https://www.ebay.com/itm/231708399395
>
>
> I'd rather use an IDC connector that matches the headers; less
> chance something gets loose/ is misconnected.

The IDC connector is a solid block and fixed size.  The "Dupont" cables can 
be used in any width or as individual wires.  The connectors on the end 
aren't tied on with string.  They work great.  You can get them in either 
male or female on both ends and in any combination.  Very flexible indeed.

-- 

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998

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#6253

rickman <gnuarm@gmail.com> writes:


>The IDC connector is a solid block and fixed size.  The "Dupont" cables can 
>be used in any width or as individual wires.  The connectors on the end 
>aren't tied on with string.  They work great.  You can get them in either 
>male or female on both ends and in any combination.  Very flexible indeed.

Yes, I see. But they are fixed length. With ribbon+IDC, I can make the cables
the correct length. 


-- 
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

[toc] | [prev] | [next] | [standalone]

#6254

David Lesher wrote on 10/28/2017 2:38 PM:
> rickman <gnuarm@gmail.com> writes:
>
>
>> The IDC connector is a solid block and fixed size.  The "Dupont" cables can
>> be used in any width or as individual wires.  The connectors on the end
>> aren't tied on with string.  They work great.  You can get them in either
>> male or female on both ends and in any combination.  Very flexible indeed.
>
> Yes, I see. But they are fixed length. With ribbon+IDC, I can make the cables
> the correct length.

They are available in many lengths, mostly multiples of 5 cm.  Works for me.

-- 

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998

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#6255

David Lesher wrote:
> Michael A Terrell <mike.terrell@earthlink.net> writes:
>
>>> I need some 10 position one-row headers but will likely use
>>> two-row 20's and ignore the other. I do plan to plug them end
>>> to end but will need to hold them.  Thinking a slotted /______\
>>> piece of soft plastic that in turn is mounted to the DIN rail.
>
>> Yes, ribbon cable. Peel off as many conductors as you need. The color
>> code repeats every ten conductors.
>
>> T1-3X-40pcs-20cm-Male-To-Male-Female-Dupont-Wire-Jumper-Cable-Arduino-Breadboard
>
>> https://www.ebay.com/itm/231708399395
>
>
> I'd rather use an IDC connector that matches the headers; less
> chance something gets loose/ is misconnected.


    Really? Have you ever used the Dupont connectors? They are reliable, 
and inexpensive.

    I've used thousands of them, along with IDC. Only a keyed header and 
a keyed IDC connector will prevent misconnecting a cable. The color 
coded wire that I mentioned makes it easy, since they follow the 
standard color code. Start with black for pin one. Consider it the 
stripe on typical ribbon cable.

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#6256

Michael A Terrell wrote on 10/28/2017 3:27 PM:
> David Lesher wrote:
>> Michael A Terrell <mike.terrell@earthlink.net> writes:
>>
>>>> I need some 10 position one-row headers but will likely use
>>>> two-row 20's and ignore the other. I do plan to plug them end
>>>> to end but will need to hold them.  Thinking a slotted /______\
>>>> piece of soft plastic that in turn is mounted to the DIN rail.
>>
>>> Yes, ribbon cable. Peel off as many conductors as you need. The color
>>> code repeats every ten conductors.
>>
>>> T1-3X-40pcs-20cm-Male-To-Male-Female-Dupont-Wire-Jumper-Cable-Arduino-Breadboard
>>>
>>
>>> https://www.ebay.com/itm/231708399395
>>
>>
>> I'd rather use an IDC connector that matches the headers; less
>> chance something gets loose/ is misconnected.
>
>
>    Really? Have you ever used the Dupont connectors? They are reliable, and
> inexpensive.
>
>    I've used thousands of them, along with IDC. Only a keyed header and a
> keyed IDC connector will prevent misconnecting a cable. The color coded wire
> that I mentioned makes it easy, since they follow the standard color code.
> Start with black for pin one. Consider it the stripe on typical ribbon cable.

Shouldn't black be pin zero?

-- 

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998

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#6257

rickman wrote:
>
> Shouldn't black be pin zero?


    If you can find a pin zero, you can use it.

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#6243

David Lesher wrote on 10/26/2017 11:35 AM:
> Michael A Terrell <mike.terrell@earthlink.net> writes:
>
>
>> PCF8574-I2C-Bidirectional-I-O-Expander-Relay-Control-SmartHome-Ardiuno-Raspberry
>
>> https://www.ebay.com/itm/282692860765	US $2.90
>
>> Used with:
>
>> /8-Eight-Channel-5V-Relay-Module-Board-with-Optocoupler-Power-Supply-PIC-ARM
>
>> https://www.ebay.com/itm/322834065204	US $6.39
>
>> gives you eight relays for $9.29 plus some wires between the modules.
>
> Seen many versions of that. Want an integrated board w/relays. Found several
> but all thus far are international $hipping.

I don't follow what is so bad about international shipping?  The typical 
vendor of inexpensive boards is in Asia and ships for free.  I found two on 
eBay that sell 8 channel I2C relay boards with a different form factor for 
$80 or $90 in the US.  Where are you?

-- 

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998

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#6248

rickman <gnuarm@gmail.com> writes:


>I don't follow what is so bad about international shipping?  The typical 
>vendor of inexpensive boards is in Asia and ships for free.  I found two on 
>eBay that sell 8 channel I2C relay boards with a different form factor for 
>$80 or $90 in the US.  Where are you?

The best boards we've found are:
<https://www.ereshop.com/shop/index.php?main_page=product_info&cPath=143_178&products_id=767>
as they come with 24V relays, an advantage.

But price it out:

$35 board, $31 of shipping.

And form factor does matter to us.

-- 
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

[toc] | [prev] | [standalone]

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