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Disclaimer: As an over-engineered fun project, I found a way to work an optocoupler into this fix where a standard transistor would have done well. Why? Because I have hundreds of them lying around and always ask myself when I will use them. Today was that day!
This is long and detailed, so don't bother watching if you will just complain about that.
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Making the ESP-01 ESP8266 Relay Module so it will work with normal Arduino sketches, using either GPIO0 or 2 to trip relay.
I use nothing more than an optocoupler to replace a STCF104W microcontroller, which is not only manufactured wrong, but the screenprinting on the PCB is wrong. This caused me to smoke a transistor, which I replace caveman-style.
The useless STC microcontroller is ripped out, and the output of GPIO0 is used (+3.3v logic) to provide the +5v logic the STC was SUPPOSED to provide via AT pins-if it were even correctly manufactured in China.
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