Robot Maker Toolkit › Pinouts › Arduino Nano

Arduino Nano pinout

Every Arduino Nano pin with its capabilities (digital, PWM, ADC, I2C, SPI, UART) and the wiring gotchas that bite. An UNO on a breadboard-friendly stick. Same chip and 5 V logic, plus two extra analog-only inputs (A6/A7).

ATmega328P @ 16 MHzLogic: 5 VFree in app

Pin	Capabilities	Watch out
D0 (RX)	DigitalUART RX	Shared with USB serial
D1 (TX)	DigitalUART TX	Shared with USB serial
D2	DigitalInterrupt
D3	DigitalPWMInterrupt
D5	DigitalPWM
D6	DigitalPWM
D9	DigitalPWM
D10	DigitalPWMSPI SS
D11	DigitalPWMSPI MOSI
D12	DigitalSPI MISO
D13	DigitalSPI SCKBuilt-in LED
A0	Analog inDigital
A3	Analog inDigital
A4	Analog inI2C SDA
A5	Analog inI2C SCL
A6	Analog in only	Cannot be a digital pin
A7	Analog in only	Cannot be a digital pin
5V	Power out/in 5V
3V3	Power out 3.3V	Weak — from USB chip, ~50 mA
VIN	Power in 7–12V
GND	Ground

Arduino Nano gotchas & notes

A6 and A7 are ANALOG-INPUT ONLY — they can't be used as digital pins.
I2C on A4 (SDA) / A5 (SCL); SPI on D10–D13; PWM on ~3, 5, 6, 9, 10, 11.
Power it from 5 V on the 5V pin, or 7–12 V on VIN; the onboard 3V3 is weak (from the USB chip).

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