It’s a significant update. The Arduino UNO and Arduino Mega 2560 update the Duemilanove and Mega respectively. They now use an ATMega8U2 instead of an FTDI USB to serial converter chip.

The arduino_code.cpp source code has been written for execution on MESP-A (Arduino MEGA 2560 module). We include the appropriate libraries, and we initialize the components’ values, such as DHT11 ...