Difference between Arduino UNO and Arduino Nano The Arduino Nano board is similar to an Arduino UNO board including similar microcontroller like Atmega328p. Thus they can share a similar program. The main difference between these two is the size. Because Arduino Uno size is double to nano board...
Differences between Arduino Uno and Arduino Micro Dimensions The general dimension of Arduino Uno is 2.7" x 2.1", whereas the dimension of Arduino Micro is 1.88" x 0.7". Connectivity Arduino Uno has 12 I/O pins with 6 PWM pins and 6 analog pins, whereas Arduino Micro has 20 I/O ...