Arduino Uno R3, the Arduino Nano, and the Arduino Pro Min
There are many versions of the Arduino. The above pictures are the Arduino Uno R3 (with surface mount IC and DIP IC), Arduino Nano, and Arduino Pro Mini.
The specifications and functionalities for the Arduino Uno, Nano, and Pro Mini are all the same. They differ only in the physical size and layout of the board.
The spcifications for the Arduino Uno R3, the Nano, and the Pro Mini are as follows:
| Model | Arduino Uno R3 |
| Model | Arduino Nano 5V model |
| Model | Arduino Pro Mini |
| CPU | ATmega328 |
| Input Voltage | Uno: 7-12V Nano: 5-12V Pro Mini: 5-12V |
| Operating voltage | 5V |
| CPU Speed | 16 MHz |
| Digital I/O pins | 14 |
| Pulse Width Modulation (PWM) analog output pins | 6 |
| Analog input pins | 6 |
| Flash | 32 KB of which 2 KB used by bootloader |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| UART | 1 |
| SPI | 1 |
| I2C | 1 |
| Size | Uno: 6.9cm x 5.3cm
Nano: 4.3cm x 1.7cm Pro Mini: 3.4cm x 1.8cm |
The Arduino Uno connection pins are as follows:
The Arduino Nano connection pins are as follows:
