Overview
The Mega is an Arduino with lots more I/O.
The big difference here was the use of the ATmega1280 CPU rather than the ATmega328. This adds several UARTs, several Analog channels etc. At some cost to shield compatibility. Like the Duemilanove, the Mega uses the FTDI serial chip.
Tech Specs
Specs for this controller (with an ATmega 1280):
| CPU | I/O | ||
|---|---|---|---|
| Manufacturer: | Atmel | Digital Inputs: | 54 |
| Architecture: | ATmega (AVR) | Digital Outputs: | 54 |
| Flash/EPROM: | 128K | Analog Inputs: | 16 channels 10 bits 15 ksps |
| EEPROM: | 4K | Analog Outputs: | 0 |
| RAM: | 8K | Serial: | 4 UART 2 SPI 1 I2C |