MicrocontrollersQUICK REFERENCE
Arduino Nano
A breadboard-friendly pin reference for the classic ATmega328P Nano.
01Pin map
- Digital
- D0–D13 plus A0–A5 as digital I/O. A6 and A7 are analog-only.
- PWM ~
- D3, D5, D6, D9, D10, D11.
- ADC
- A0–A7; 10-bit readings, 0–1023.
02Bus connections
- I2C
- SDA A4 / SCL A5.
- SPI
- MOSI D11 / MISO D12 / SCK D13 / typical CS D10.
- UART
- RX D0 / TX D1; shared with the USB serial converter.
03Power
- Inputs
- Mini USB or recommended 7–12 V at VIN. Regulated 5 V only at 5V.
- Logic
- 5 V ATmega328P; not the Nano 33, Nano ESP32 or Nano Every pin reference.
- Orientation
- Use printed pin labels and the official pinout; clone layouts and USB chips vary.