# Arduino Nano > The classic breadboard-friendly Arduino — ATmega328P at 16MHz, 32KB flash, 2KB SRAM, 14 digital I/O (6 PWM), 8 analog inputs, Mini-B USB, and 5V operation in a tiny 45×18mm form factor. The compact original. ## Quick Facts - **Brand:** Arduino - **Board Type:** dev-board - **Price:** ~$19.7 - **Product Readiness:** consumer - **CPU:** ATmega328P @ 16MHz, 8-bit AVR - **CPU Architecture:** AVR - **CPU Cores:** 1 - **RAM:** 2KB SRAM - **Flash:** 32KB - **USB:** Mini-B USB - **Power:** 5V via Mini-B USB or 6-20V via Vin - **Operating Voltage:** 5V - **Dimensions:** 45 × 18mm - **Weight:** 7g - **Antenna:** No - **SD Card:** No ## Open Source - **Firmware:** Yes - **Schematics:** Yes - **PCB Layout:** Yes ## Compatible Firmware arduino ## Use Cases - educational-platform - iot ## Components - **ATmega328P** (mcu): Microchip ATmega328P 8-bit AVR at 16MHz with 32KB flash, 2KB SRAM, 1KB EEPROM, and 8 ADC channels. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fww1.microchip.com%2Fdownloads%2Fen%2FDeviceDoc%2FAtmel-7810-Automotive-Microcontrollers-ATmega328P_Datasheet.pdf&ref=openhardware.directory&product=arduino-nano&source=md-export) ## Protocols - **SPI**: MOSI: D11, MISO: D12, SCK: D13, SS: D10 - **I2C**: SDA: A4, SCL: A5 - **UART**: TX: D1, RX: D0 ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | D0 | UART RX | UART | digital-input, digital-output | | D1 | UART TX | UART | digital-input, digital-output | | D2 | Digital I/O / INT0 | | digital-input, digital-output | | D3 | PWM / INT1 | PWM | digital-input, digital-output, pwm | | D4 | Digital I/O | | digital-input, digital-output | | D5 | PWM | PWM | digital-input, digital-output, pwm | | D6 | PWM | PWM | digital-input, digital-output, pwm | | D7 | Digital I/O | | digital-input, digital-output | | D8 | Digital I/O | | digital-input, digital-output | | D9 | PWM | PWM | digital-input, digital-output, pwm | | D10 | PWM / SPI SS | SPI | digital-input, digital-output, pwm | | D11 | PWM / SPI MOSI | SPI | digital-input, digital-output, pwm | | D12 | SPI MISO | SPI | digital-input, digital-output | | D13 | SPI SCK / LED | SPI | digital-input, digital-output | | A0 | Analog Input | ADC | digital-input, digital-output, adc | | A1 | Analog Input | ADC | digital-input, digital-output, adc | | A2 | Analog Input | ADC | digital-input, digital-output, adc | | A3 | Analog Input | ADC | digital-input, digital-output, adc | | A4 | I2C SDA / Analog | I2C | digital-input, digital-output, adc | | A5 | I2C SCL / Analog | I2C | digital-input, digital-output, adc | | A6 | Analog Input (only) | ADC | adc | | A7 | Analog Input (only) | ADC | adc | ## Description ## Overview The Arduino Nano is the compact breadboard-friendly version of the classic Arduino, delivering the same ATmega328P processing power as the Uno Rev3 in a much smaller 45×18mm package. With 32KB flash, 2KB SRAM, and 1KB EEPROM, it runs the same sketches and libraries as the Uno while fitting neatly into breadboards for rapid prototyping. Featuring 14 digital I/O pins (6 PWM), 8 analog inputs (two more than the Uno), Mini-B USB for programming and power, and header pins on both sides, it's the go-to board for space-constrained projects. The board can be powered via USB, an unregulated 6-20V supply on pin 30, or a regulated 5V supply on pin 27. Despite newer Nano variants with more powerful processors, the original Nano remains popular for its simplicity, rock-solid reliability, extremely wide library compatibility, and the massive ecosystem of tutorials and projects built around the ATmega328P platform. ## Where to Buy - [Arduino Store (US)](https://openhardware.directory/r?to=https%3A%2F%2Fstore-usa.arduino.cc%2Fproducts%2Farduino-nano&ref=openhardware.directory&product=arduino-nano&source=md-export) — $19.70 - [Arduino Store (EU)](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Farduino-nano&ref=openhardware.directory&product=arduino-nano&source=md-export) — €21.76 - [DigiKey](https://openhardware.directory/r?to=https%3A%2F%2Fwww.digikey.com%2Fen%2Fproducts%2Fdetail%2Farduino%2FA000005%2F2638989&ref=openhardware.directory&product=arduino-nano&source=md-export) — $22.00 - [Mouser](https://openhardware.directory/r?to=https%3A%2F%2Fwww.mouser.com%2FProductDetail%2FArduino%2FA000005&ref=openhardware.directory&product=arduino-nano&source=md-export) — $22.00 - [Amazon US](https://openhardware.directory/r?to=https%3A%2F%2Fwww.amazon.com%2Fdp%2FB0097AU5OU&ref=openhardware.directory&product=arduino-nano&source=md-export) — $22.00 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Farduino-nano&ref=openhardware.directory&product=arduino-nano&source=md-export) - [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fhardware%2Fnano%2F&ref=openhardware.directory&product=arduino-nano&source=md-export) - [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fdatasheets%2FA000005-datasheet.pdf&ref=openhardware.directory&product=arduino-nano&source=md-export) - [schematics](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fschematics%2FA000005-schematics.pdf&ref=openhardware.directory&product=arduino-nano&source=md-export) ## Tags `arduino`, `nano`, `atmega328p`, `classic`, `breadboard`, `compact`, `5v` ## Images ![Arduino Nano](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-nano/b8d025f9e8c7.jpg) ![Arduino Nano](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-nano/9d17d39cc2c8.jpg) --- [View full device page](https://openhardware.directory/devices/arduino-nano)