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Topic: DoReMi Serial and Arduino

Max M. Fuhlendorf
Film Handler

Posts: 12
From: São Caetano do Sul, SP, Brazil
Registered: Jun 2011

posted 01-29-2019 10:52 AM

quote: Carsten Kurz
Use one of these. Very often, they can be bought for less than a single basic relay costs locally.

Oh, yes, I bough a relay board with optocouplers (just like the ones in the link you sent, thanks!) for extra safety. This is what I'm going to use, actually. I was just wondering if these optocoupled relay boards might draw too much current from the GPOs (they draw about 100ma to operate the coils, I read)...

Thanks for the assistance, I'm somewhat of a noob with this.

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Tony Bandiera Jr
Film God

Posts: 3067
From: Moreland Idaho
Registered: Apr 2004

posted 01-29-2019 11:05 AM

quote: Max M. Fuhlendorf
Oh, yes, I bough a relay board with optocouplers (just like the ones in the link you sent, thanks!) for extra safety. This is what I'm going to use, actually. I was just wondering if these optocoupled relay boards might draw too much current from the GPOs (they draw about 100ma to operate the coils, I read)...

Thanks for the assistance, I'm somewhat of a noob with this.

I'm willing to bet that the boards have a separate input pin for "power" and "ground" to drive the relay coils. You will need to provide that input voltage with a small power supply.

Usually, one of the points in using an optoisolated or transistor driver boards is to avoid having the host device seeing the burden of the relay current (and the spikes caused by the coils.)

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Max M. Fuhlendorf
Film Handler

Posts: 12
From: São Caetano do Sul, SP, Brazil
Registered: Jun 2011

posted 01-29-2019 11:08 AM

quote: Tony Bandiera Jr
I'm willing to bet that the boards have a separate input pin for "power" and "ground" to drive the relay coils. You will need to provide that input voltage with a small power supply.

Usually, one of the points in using an optoisolated or transistor driver boards is to avoid having the host device seeing the burden of the relay current (and the spikes caused by the coils.)

It does

I was just reading about it now. Feeling a little silly having come here to ask these questions before reading about the optoisolated relay modules a little more.

Thanks!

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009

posted 01-29-2019 11:14 AM

Yup. The relay boards I linked to above offer supplies for input and coil switching circuit, and a jumper to split them if necessary. Typically, the easiest way to do is to use a simple USB wall charger. Some of the larger boards may need 12V instead of 5V.

- Carsten

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Marin Zorica
Jedi Master Film Handler

Posts: 671
From: Biograd na Moru, Croatia
Registered: May 2003

posted 01-29-2019 05:29 PM

If using arduino, get some more programming and use it with ethernet shield, so you can hook up to ethernet of server-projector network which has some adventages like:

-you can have long cable (ethernet)
-more isolated from server
-more than one device can be hook up with different IP

I did it many times for using with any kind of automation and works perfect........

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Max M. Fuhlendorf
Film Handler

Posts: 12
From: São Caetano do Sul, SP, Brazil
Registered: Jun 2011

posted 01-30-2019 08:13 PM

quote: Carsten Kurz
Yup. The relay boards I linked to above offer supplies for input and coil switching circuit, and a jumper to split them if necessary. Typically, the easiest way to do is to use a simple USB wall charger. Some of the larger boards may need 12V instead of 5V.

Perfect! I used an old router 5V power supply, and tested it today, the relays worked perfectly. The only thing remaining to do now is install it next week. Thanks for all the help! [Smile]

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