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Communication between 3.3 V and 5 V system

Connect the grounds of the two boards (maybe you already have). Also, the maximum GPIO pin current of the RSP8266 is 12 mA. Connecting a transistor without a base resistor will send a large current ...
ocrdu's user avatar
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Grove relay stuttering

I would suspect that the switching of the pump motor causes a decently high current spike that messes with your control side. Switching inductive loads always comes with issues. Try adding a ...
TPoE's user avatar
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