ESP8266 Community Forum

- Tue Jul 21, 2015 4:10 pm #23864 I've tried to switch the connection but it doesn't work!

Maybe because it is a Solid State Relay?

what to do?

- Tue Jul 21, 2015 5:14 pm #23869 No, a solid state relay is like connecting a simple LED, except if yours is special, it should work by simply applying voltage to its input.
I've explained the source/sink differences in viewtopic.php?f=13&t=3119&p=22812 for a LED, but samething apply to SSR.
You need to hook it up as "sink" (except VCC will be 3V, not the 5V shown) :

- Tue Jul 21, 2015 5:21 pm #23870 I'm not using any resistor.
Just switched positive and GND as you suggested.

This is my SSR model: http://www.amazon.it/COLEMETER-STATICO- ... B00CGWU8N4

why is not working? :/

- Tue Jul 21, 2015 5:49 pm #23873 Resistor maybe not needed since it has probably an internal one.
Did you try the SSR in stand-alone ? Maybe the SSR itself is defective.
If it is working, can you measure how much current is it taking ?
(Although ESP specs mentionned 12mA max current, this is enough to drive it)
Are you really connected to GPIO2 ?
Are you sure that your software is working (maybe try a LED instead of SSR to debug) ?