The main differences between these two are listed in the following table. The programming of UNO can be done with a USB cable whereas Nano uses the mini USB cable. So Uno boards use more space on the system. Because Arduino Uno size is double to nano board. The main difference between these two is the size. The Arduino Nano board is similar to an Arduino UNO board including similar microcontroller like Atmega328p. IIC (A4, A5): These pins are used for supporting TWI communication.ĪREF: This pin is used to give reference voltage to the input voltage Difference between Arduino UNO and Arduino Nano Inbuilt LED (13): This pin is used to activate the LED. SPI (10, 11, 12, & 13): These pins are used for supporting SPI communication.
