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Another newbie question: how to connect a relay?
Posted:
Wed May 20, 2015 11:27 amby Jabberwock
It seems I have got the ESP8266-01 module working and responding to web commands (switching the GPIO2 high or low), but then I encountered another problem: I naively thought that it would be sufficient to connect GPIO2 to the IN pin of the relay... But then the ESP stops working. I assume something should go between the two, but what?
Re: Another newbie question: how to connect a relay?
Posted:
Wed May 20, 2015 11:40 amby martinayotte
Of course, you can drive a relay coil directly with a GPIO, you need to drive it with something like a MOSFET or a transistor.
Re: Another newbie question: how to connect a relay?
Posted:
Wed May 20, 2015 11:46 amby Jabberwock
Sorry, I was not precise enough... I meant a typical relay module like this:
which, it seems, can be driven by a GPIO of an Arduino, etc.
Re: Another newbie question: how to connect a relay?
Posted:
Wed May 20, 2015 12:01 pmby martinayotte
Difficult to see from the picture : if there is a MOSFET, fine.
Next thing to figure out if the input is active high or active low.
Also, beware to ESP-01 has limited number of GPIOs, and some needs to be pulled-up at startup.