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Please, take caution with input voltages depending on your exact development board!I have an ESP12E DEVKIT that has an CP2102 USB to serial TTL and voltage regulator that only accepts input voltages between 4 and 5.25v, so you will need (in that case) an 4.7 or (better) 5.1v zener diode, but remember that the difference will be dissipated by the limiting resistor.Good luck!
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