# DC Boarduino

> The DC Boarduino is a slim, breadboard-friendly Arduino-compatible development board based on the ATmega328 at 16MHz, with a 2.1mm DC barrel jack for 7–17V input, USB-TTL serial header, ICSP programming port, and a form factor optimized for direct breadboard insertion.

## Quick Facts

- **Brand:** Adafruit
- **Board Type:** dev-board
- **Price:** ~$17.5
- **Product Readiness:** diy-kit
- **CPU:** ATmega328P @ 16MHz
- **CPU Architecture:** AVR 8-bit RISC
- **CPU Cores:** 1
- **RAM:** 2 KB SRAM
- **Flash:** 32 KB
- **Power:** 7–17V DC via 2.1mm barrel jack
- **Operating Voltage:** 5V
- **Dimensions:** 76mm × 20.3mm × 1.65mm
- **Weight:** 4.73g

## Open Source

- **Status:** fully-open
- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** Yes

## Compatible Firmware

arduino

## Use Cases

- iot
- industrial-automation

## Components

- **ATmega328P** (mcu): Microchip ATmega328P 8-bit AVR RISC at 16MHz, 32KB flash, 2KB SRAM, 1KB EEPROM — [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=dc-boarduino&source=md-export)

## Protocols

- **I2C**: SDA: A4, SCL: A5
- **SPI**: MOSI: D11, MISO: D12, SCK: D13, SS: D10
- **UART**: TX: D1, RX: D0
- **PWM**
- **ADC**
- **JTAG**

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| D0 | D0 | — | GPIO, UART RX |
| D1 | D1 | — | GPIO, UART TX |
| D2 | D2 | — | GPIO, INT0 |
| D3 | D3 | — | GPIO, PWM, INT1 |
| D4 | D4 | — | GPIO |
| D5 | D5 | — | GPIO, PWM |
| D6 | D6 | — | GPIO, PWM |
| D7 | D7 | — | GPIO |
| D8 | D8 | — | GPIO |
| D9 | D9 | — | GPIO, PWM |
| D10 | D10 | — | GPIO, PWM, SPI SS |
| D11 | D11 | — | GPIO, PWM, SPI MOSI |
| D12 | D12 | — | GPIO, SPI MISO |
| D13 | D13 | — | GPIO, SPI CLK, LED |
| A0 | A0 | — | GPIO, ADC |
| A1 | A1 | — | GPIO, ADC |
| A2 | A2 | — | GPIO, ADC |
| A3 | A3 | — | GPIO, ADC |
| A4 | A4 | — | GPIO, ADC, I2C SDA |
| A5 | A5 | — | GPIO, ADC, I2C SCL |

## Available Software

- **[Arduino IDE]()** (open-source)

## Description

## Overview

The DC Boarduino is Adafruit's early Arduino-compatible development board designed specifically for breadboard use. Unlike a standard Arduino Uno, the Boarduino's narrow 76mm × 20mm form factor allows it to plug directly into a solderless breadboard, leaving rows free on both sides for circuit connections. It uses the familiar ATmega328 at 16MHz with a custom Arduino bootloader for USB serial programming.

Power comes from a standard 2.1mm DC barrel jack supporting 7–17V input, regulated to 5V on board. A 1N4001 diode provides reverse-polarity protection. Programming is done via a 6-pin USB-to-TTL serial header (cable sold separately) with auto-reset capability, or via the ICSP header. The board supports the full Arduino digital and analog pin set: D0–D13 and A0–A5, plus ARef, 5V, Ground, Vin, and Reset.

Two indicator LEDs are included — a green power LED and a red LED on pin 13 for built-in blink diagnostics. EagleCAD schematics and Fritzing files are available. The DC Boarduino is genuinely distinct from the Arduino Uno: it has no onboard USB-to-serial chip (requiring an external FTDI or USB-TTL cable), no USB Type-B port, and a significantly more compact and breadboard-optimized layout.

## Where to Buy

- [Adafruit](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F72&ref=openhardware.directory&product=dc-boarduino&source=md-export) — $17.50

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F72&ref=openhardware.directory&product=dc-boarduino&source=md-export)
- [docs](https://openhardware.directory/r?to=https%3A%2F%2Flearn.adafruit.com%2Fboarduino-kits&ref=openhardware.directory&product=dc-boarduino&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fadafruit&ref=openhardware.directory&product=dc-boarduino&source=md-export)

## Tags

`boarduino`, `arduino-compatible`, `atmega328`, `breadboard`, `avr`, `diy-kit`, `ftdi`, `adafruit`

## Images

![DC Boarduino](https://nbg1.your-objectstorage.com/openhardware-directory/entities/dc-boarduino/93fbe6160fb4.jpg)
![DC Boarduino](https://nbg1.your-objectstorage.com/openhardware-directory/entities/dc-boarduino/29a2d0b29742.jpg)
![DC Boarduino](https://nbg1.your-objectstorage.com/openhardware-directory/entities/dc-boarduino/0ff766b93369.jpg)

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