![]() The onboard ESP8266 has 4MiB of flash memory, and the ATmega2560 has 256kb. It is important to know that this board contains two chips and because of that requires uploading two different programs to each of the chips. This board has a lot of spotty information circulating the internet. ![]() 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 the ATmega2560.
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