- This will allow you to reliably run an Arduino Mega at **3.3V**! Use Frequency: 8MHz, Upload Speed: 15200 to achieve this. - The default for the Arduino Mega is, Frequency: 16MHz, Upload Speed: ...

This tutorial goes over how to use the Mega 2560 R3 built-in ESP8266 and create a web server by flashing the onboard ESP8266 with AT firmware which only requires programming only the ATmega2560. 📶 ...