WiredMaker wrote:I used Arduino IDE 1.8.9 and uploaded a sketch and i think that replaced the Lua that was already on it. But shouldn't it still work? Or do i need to go back to Lua? I'm not sure what to do.
Once you flash the ESP with other firmware, the previous one will be overwritten.
I personally think you're better off with everything else than AT commands, but if you want to reflash your ESP with an AT command set, you can get it from the website of the manufacturer.
The latest version at this time is ESP8266 AT Bin V1.7.0.
You can get the documentation of this version here.
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)