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.

I2C and SPI pins are matched accordingly in order to support I2C and SPI based shields: Nano V3 I2C bus pins (SDA on pin A4 and SCL on pin A5) are matched with Mega 2560 PRO pins (SDA on pin D20 and ...

Connect the data pin of the DHT11 sensor to digital pin 2 on the Arduino Mega 2560. U-Blox NEO-M8N GPS Module: Connect the RX pin of the U-Blox NEO-M8N GPS module to digital pin 18 (TX1) on the ...