rudy wrote:The bigger question is, why is he using an Arduino in the first place.
Good thinking, wasn't paying attention enough myself.
(It's rather warm in the office atm, since the airco broke down and still isn't repaired, so I'm having trouble thinking straight).
Long time ago I used the UNO, since I discovered the ESP.
When you're new, don't start with a separate ESP (ESP-01 to ESP-14) module.
Get yourself a proper development board: NodeMCU - WeMos D1 - WeMos (UNO form factor) - Witty Board
ESP power requirements are 3.3V±10%@350mA
The ESP8266 IS NOT 5V tolerant on ANY pin (see item 5.14 on page 25 of the FAQ)