ESP8266 Community Forum

- Mon Jan 05, 2015 12:37 pm #6366 Well it boots up correctly if I pull the GPIO high using a wire, or a low (50 Ohm) resistor. But then I can't switch the state of the relay anymore.
The transistor before the relay is connected to the GPIO through a 100 Ohm resisitor.

- Mon Jan 05, 2015 12:52 pm #6367 Well I made up a quick shematic:

shematic.png

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- Mon Jan 05, 2015 1:11 pm #6372 Minimal base resistor for bipolar transistor connected to GPIO is 270ohm.

- Mon Jan 05, 2015 1:16 pm #6373 Hey Jannik, remember to add a diode on the relay to protect your circuit from inductive spikes.