Solid State Relays.

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi all, I am doing some research into building a thermostat for a fridge, by having an Arduino controlling a SSR. The one i was looking at is http://www.littlebirdelectronics.com/products/Solid-State-Relay-3%252d32VDC-Input%2C-240VAC-40A-Switching.html

But i wanted to know if it were possible to power the Arduino from the SSR? I am new to all of this and am trying to find some documentation. I would think that i would need some type of transformer?

I'm sure someone has to of done something similar. I would think that it would be the same principle as using an Arduino to turn regular house light on and off.

Any help or a point to some documentation regarding this would be greatly appreciated.

Cheers.

2

Ok so i will have to have two power points, fair enough. It may have been wishful thinking that i could tap into the one powering the fridge. :slight_smile:

I found this one at a different supplier, http://www.dse.com.au/cgi-bin/dse.storefront/4c9af54000c010ba2740c0a87e0106b9/Product/View/P8031 it is at a fraction of the cost. Is it basically the same thing?

:slight_smile: I really have to do a lot of reading before i start playing around with this sort of stuff, might hurt myself :slight_smile:

3

Both products have nothing to do which each other.
One is an SSR rated for 40A
The other is an electro-mechanical relay rated for 10A and needing 12V control voltage

Alas, prices for high current SSR are high:
2A $10
5A $15
25A $30
50A $50
100A $80

Note they might need LARGE heat sinks

4

Oh ok. So that one i posted before is what i will need but just a bit pricy?

I think i might keep an eye on ebay. Might find some "Hong Kong" seller. They always seem to have items for cheap. I would think that they all come from there anyway.