The Adafruit ATSAMD09 Breakout with seesaw is a versatile I2C peripheral board built on the Adafruit seesaw framework. Seesaw is a near-universal converter that lets you add GPIO, ADC, PWM, and more to any I2C-capable microcontroller or single-board computer — all over a simple I2C connection.

Rather than sourcing separate I2C GPIO expanders, ADCs, and PWM drivers, this single board provides a wide range of capabilities controlled through an easy-to-use library. It's ideal for adding extra hardware support to platforms like Raspberry Pi, ESP8266, or Arduino.

Key Features

• Seesaw I2C Framework – Universal converter providing GPIO, ADC, PWM, and NeoPixel control over I2C
• 3× 12-bit ADC Inputs – High-resolution analogue-to-digital conversion
• 3× 8-bit PWM Outputs – For LED dimming, motor control, and other applications
• 7× GPIO – With selectable pullup or pulldown resistors
• NeoPixel Output – Drive up to 340 NeoPixel LEDs from a single pin
• 64-byte EEPROM – Non-volatile memory for storing access tokens or MAC addresses
• Interrupt Output – Trigger from any of the configured peripherals
• 2× I2C Address Selection Pins – Run multiple boards on the same bus
• Activity LED – Visual feedback for board status
• Reprogrammable – Customise the firmware to adjust peripheral allocation (requires J-Link programmer and SWD adapter)

Also Available

• ATtiny1616 Seesaw Breakout with STEMMA QT – More GPIO/ADC/PWM, 16KB flash, STEMMA QT connectors
• ATtiny816 Seesaw Breakout with STEMMA QT – Compact alternative with STEMMA QT connectors

Ideal For

• Adding extra I/O to Raspberry Pi, ESP8266, or Arduino projects
• NeoPixel control from I2C-only platforms
• Rapid prototyping with configurable peripherals
• Seesaw firmware development and testing

Package Contents

• 1× Adafruit ATSAMD09 Breakout with seesaw
• 1× Header strip set