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joefly wrote: Ok after fooling around with it all day, I realized the 5 vdc relay module I got not need a transistor, but the IO pin from the esp8266 will drive it with an externally supplied 5v to the relay module.
without 5V power the relay is open
with 5v power the relay is open,
if the signal pin is HIGH on the relay module is high, the relay is closed, if the signal from ESP8266 is LOW the relay, it is open..
So looks like the relay module I got is able to work with 3v3 from esp8266.
I am not sure if the relay module I got is different from the example, but in the end I can not get it to work as described in the example.
But looking at the photo of the relay, it is different from mine, as mine only has a diode, small 3 leg chip, resistor and LED besides the relay. In the example, there are more components on the relay module.