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Use the Ams1117 3.3v voltage regulator, because a voltage divider made with resistors will probably render the amperes too low even if you get 3.3v to power the module, and you will be frustrated. I did not add a capacitor and resistor indicated to go with this regulator, because it is running on a regulated power supply, and it is working solid for some years 3 - 5v Orangepin 2 - 3.3v Yellowpin 1 - GND Blue - two jumper cables You can solder some male jumper wires to this setup, so you can have always ready a 5v and 3.3v on the same power supply, very usefull if you are prototyping with a breadboard. WIRING: ESP USB 3.3v GND - - - - GND- - - - GNDTX - - - - - RXRX - - - - - TX3.3 - - - - - - - - - - - - - 3.3Ground together: Voltage Regulator, the usb-ttl module and the ESP module.