Adafruit ATtiny817 Breakout with seesaw - STEMMA QT / Qwiic
The Adafruit ATtiny817 Breakout with seesaw is a compact development board that combines an ATtiny817 microcontroller with the Adafruit seesaw I2C framework and STEMMA QT connectivity. Pre-programmed with seesaw firmware, it acts as an I2C-controlled co-processor — adding GPIO, ADC, PWM, and NeoPixel support to any I2C-capable host.
This board can also be reprogrammed as a general-purpose ATtiny817 development board using the megaTinyCore Arduino core. With STEMMA QT connectors, it works seamlessly as either an I2C controller or peripheral with plug-and-play support.
Key Features
- ATtiny817 Microcontroller – 8KB flash, 512 bytes RAM, 128 bytes EEPROM, internal oscillator up to 20 MHz, hardware multiplier
- Seesaw I2C Framework – Universal converter providing GPIO, ADC, PWM, and NeoPixel control over I2C
- 14× GPIO – With selectable pullup resistors
- 9× 10-bit ADC Inputs – Pins 0, 1, 2, 3, 6, 7, 18, 19, 20
- 5× 8-bit PWM Outputs – Pins 0, 1, 9, 12, 13
- NeoPixel Output – Drive up to 60 NeoPixel LEDs from a single pin
- 127-byte EEPROM – Non-volatile memory for tokens or MAC addresses (last byte used for I2C address)
- Interrupt Output – Pin 15, triggered by any configured peripheral
- 2× I2C Address Selection Pins – Pins 16 and 17 for running multiple boards on one bus
- 2× STEMMA QT / Qwiic Connectors – Plug-and-play I2C with 10K pullup resistors (pins 10, 11)
- 3.3V Regulator – Runs at Vin by default (up to 5V); solder jumper to select 3.3V logic
- 2V to 5V Operation – Wide voltage range for flexible integration
- Power and Activity LEDs – Green power LED, red indicator LED on pin 5
Also Available
- ATtiny1616 Seesaw Breakout with STEMMA QT – More memory (16KB flash, 2KB RAM) and up to 250 NeoPixels
- ATtiny816 Seesaw Breakout with STEMMA QT – Same memory, different pin mapping
- ATSAMD09 Seesaw Breakout – Original seesaw breakout with ARM Cortex-M0+
Ideal For
- Adding extra I/O to Raspberry Pi, ESP32, or Arduino projects via I2C
- NeoPixel control from I2C-only platforms
- ATtiny817 development and prototyping
- Seesaw firmware customisation and testing
Package Contents
- 1× Adafruit ATtiny817 Breakout with seesaw
- 1× Header strip set
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Adafruit ATtiny817 Breakout with seesaw is a compact development board that combines an ATtiny817 microcontroller with the Adafruit seesaw I2C framework and STEMMA QT connectivity. Pre-programmed with seesaw firmware, it acts as an I2C-controlled co-processor — adding GPIO, ADC, PWM, and NeoPixel support to any I2C-capable host.
This board can also be reprogrammed as a general-purpose ATtiny817 development board using the megaTinyCore Arduino core. With STEMMA QT connectors, it works seamlessly as either an I2C controller or peripheral with plug-and-play support.
Key Features
- ATtiny817 Microcontroller – 8KB flash, 512 bytes RAM, 128 bytes EEPROM, internal oscillator up to 20 MHz, hardware multiplier
- Seesaw I2C Framework – Universal converter providing GPIO, ADC, PWM, and NeoPixel control over I2C
- 14× GPIO – With selectable pullup resistors
- 9× 10-bit ADC Inputs – Pins 0, 1, 2, 3, 6, 7, 18, 19, 20
- 5× 8-bit PWM Outputs – Pins 0, 1, 9, 12, 13
- NeoPixel Output – Drive up to 60 NeoPixel LEDs from a single pin
- 127-byte EEPROM – Non-volatile memory for tokens or MAC addresses (last byte used for I2C address)
- Interrupt Output – Pin 15, triggered by any configured peripheral
- 2× I2C Address Selection Pins – Pins 16 and 17 for running multiple boards on one bus
- 2× STEMMA QT / Qwiic Connectors – Plug-and-play I2C with 10K pullup resistors (pins 10, 11)
- 3.3V Regulator – Runs at Vin by default (up to 5V); solder jumper to select 3.3V logic
- 2V to 5V Operation – Wide voltage range for flexible integration
- Power and Activity LEDs – Green power LED, red indicator LED on pin 5
Also Available
- ATtiny1616 Seesaw Breakout with STEMMA QT – More memory (16KB flash, 2KB RAM) and up to 250 NeoPixels
- ATtiny816 Seesaw Breakout with STEMMA QT – Same memory, different pin mapping
- ATSAMD09 Seesaw Breakout – Original seesaw breakout with ARM Cortex-M0+
Ideal For
- Adding extra I/O to Raspberry Pi, ESP32, or Arduino projects via I2C
- NeoPixel control from I2C-only platforms
- ATtiny817 development and prototyping
- Seesaw firmware customisation and testing
Package Contents
- 1× Adafruit ATtiny817 Breakout with seesaw
- 1× Header strip set
