In order to understand the differences, between the two things one must first characterize them a bit. Simply speaking - Arduino Mega R3 ensures you will be able to use new shields for a long time.Arduino UNO > Leonardo, but is it for sure? IOREF in turn will allow a single shield to work with both Arduino Mega R3 and future versions employing 3.3V logic. Thanks to the new pins, shields using I2C and designed to use SDA and SCL at the new pins will also work with Arduino Mega R3 as well as future Arduino versions. These models may not have SDA and SCL at A4 and A5 and operate at supply voltage 3.3V. SDA and SCL are available at the same pins in Arduino UNO and Mega, IOREF is 5V in every case, so what are the new pins for? Things may change when new Arduino models, Due and Leonardo, will be introduced. This allows shields to adapt to Arduino's voltage level. In analog section among new pins there is IOREF signal informing, at which voltage levels the board works. In R3 they are also there, so the new pins are merged with old ones. These aren't additional signals - in Arduino UNO R2 SDA and SCL are available at A5 and A4. In digital pins row there are now two separate I2C (or TWI, according to Atmel's documentation) bus signals - SDA and SCL. keyboard instead of serial port)Īdding new pins causes some confusion. ATmega8U chip responsible for USB communication were replaced by ATmega16U (16 kB of flash memory instead of 8) - this involves only advanced users, who want to change the type of hardware, as which Arduino appears, when connected to PC (e.g.In "analog section" there are now 8 and 6 pins instead of 2 x 6. In "digital section" there are two pin header sockets: 10 and 8 pins, instead of 2 x 8.
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