[TriEmbed] Driving 32 5v relays

[pete@soper.us]

What's extra funny about this thread now is that the designer of that board (Terry) is on this list!
I'm going to put two more cents in and then shut up:

Read Terry's "Electrical Safety Page". Mounting these boards in a well grounded metal box that is never opened with mains current applied is worth considering.

Pete

----- Reply message -----
From: "Rodney Radford via TriEmbed" <triembed at triembed.org>
To: "Robert Gasiorowski" <rgresume at gmail.com>
Cc: "triembed at triembed.org" <TriEmbed at triembed.org>
Subject: [TriEmbed] Driving 32 5v relays
Date: Thu, Jul 16, 2015 5:10 PM

Everyone is trying to help, and that is good, but please look at the specs of this board, which is what he already has:

http://yourduino.com/sunshop2/index.php?l=product_detail&p=156

It has both transistors and opto-isolators, ready to go... ;-)

It is active low, so all that needs to be done to turn on a relay is to provide a ground path for the LED to sink the couple milliamps (1k resistor in series with the LED and connected to 5v supply).

On Thu, Jul 16, 2015 at 5:04 PM, Robert Gasiorowski <rgresume at gmail.com> wrote:
If you already have relay boards with transistor driver, then all you need is weak driver like 595.If you have relays only, then I would suggest using high current version of 595,        TPIC6C595 (or higher current B595 & A595)
No need for opto-isolators if you use flyback diodes.

Rob.

On Thu, Jul 16, 2015 at 4:53 PM, Rodney Radford via TriEmbed <triembed at triembed.org> wrote:
Keep in mind he has already purchased the relay board that includes the opto isolation and transistor drive... so to do anything else involves additional money for a new solution.
What he has is definitely good enough... no reason to buy anything different 

On Thu, Jul 16, 2015 at 4:48 PM, John Vaughters via TriEmbed <triembed at triembed.org> wrote:

>I am with Rodney on the opto-isolation relay board as the best solution.

Small change: Opto-isolated triacs or the opto-isolated relay board. Kind of a toss up, I would probably break the tie on cost or convenience of the choices.

John Vaughters



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