BACK IN STOCK – Adafruit ATtiny817 Breakout with seesaw – STEMMA QT / Qwiic

5233

BACK IN STOCK – Adafruit ATtiny817 Breakout with seesaw – STEMMA QT / Qwiic


This breakout board is a “three in one” product:

  1. The ATtiny817 is part of the ‘next gen’ of AVR microcontrollers, and now we have a cute development/breakout board for it, with just enough hardware to get the chip up and running.
  2. It’s also an Adafruit seesaw board. Adafruit seesaw is a near-universal converter framework that allows you to add and extend hardware support to any I2C-capable microcontroller or microcomputer. Instead of getting separate I2C GPIO expanders, ADCs, PWM drivers, etc, seesaw can be configured to give a wide range of capabilities.
  3. Finally, with STEMMA QT connectors on it, you could use it as either an I2C controller or peripheral with plug-and-play support.

We primarily designed this board for our own use: it’s a mini dev board that lets us design with the ATtiny817 just like we did for the ATSAMD09. With the 2021 silicon shortage, we’re adapting some of our SAMD09 designs to the ATTiny8xx series and wanted a quick minimal board to test code on.

5233 iso 02 ORIG 2021 09

5233 top 02 ORIG 2021 09

5233 top 01 ORIG 2021 09

Each breakout comes with the assembled and tested board, as well as some header strips. Each PCB is fairly minimal and contains:

  • ATtiny817 8-bit microcontroller
    • 8KB flash, 512 bytes of RAM, 128 bytes of EEPROM
    • Internal oscillator can run up to 20MHz
    • Internal hardware multiplier
    • Can run from 2V to 5V power/logic (check the datasheet for max speed at desired power)
  • 3.3V regulator – by default we run at the Vin voltage, which can be 5V, but there’s a solder jumper on the bottom if you’d like to select 3V logic.
  • Green power LED
  • Red indicator LED
  • Two STEMMA QT I2C connectors with 10K pull-up resistors, connected to pins 10 and 11

This board comes pre-programmed with seesaw peripheral code that will let it act as an “I2C to something” converter, basically, a little I2C-controlled friend to do all the timing-sensitive things many microcontrollers and microcomputers are not good at.

5233 kit ORIG 2021 09

5233 side ORIG 2021 09

For example, using this breakout with the pre-burned seesaw firmware gives you

  • 14 x GPIO with selectable pull-up resistors
  • 9 x 10-bit ADC inputs – pins 0, 1, 2, 3, 6, 7, 18, 19, 20
  • 5 x 8-bit PWM outputs – pins 0, 1, 9, 12, 13
  • 1 x NeoPixel output (up to 60 pixels)
  • 1 x EEPROM with 127 bytes of NVM memory (handy for storing small access tokens or MAC addresses) – last byte of EEPROM is used for I2C address selection
  • 1 x Interrupt output that can be triggered by any of the accessories – pin 15
  • 2 x I2C address selection pins – pins 16 and 17
  • 1 x Activity LED on pin 5, tied active low

Of course, you can configure or reprogram the chip to however you want to use it – we like using SpenceKonde’s megaTinyCore which brings Arduino peripheral support to this series of chips. To program the chip you will need a ‘UPDI’ programmer, which you can make with a USB-to-Serial cable and a single 4.7K or 10K resistor.

Please note: The boards do not come with a bootloader. If you want to do development on seesaw (e.g. changing the configuration) you need a separate UPDI programming setup! The firmware we put on is available as this example sketch, compiled using the megaTinyCore. We don’t provide any support for custom builds of seesaw – we think this is cool and useful for the Maker community!

For more details including the documentation on how to use seesaw, libraries for Arduino/CircuitPython/Raspberry Pi Python, schematics, and more check out the Adafruit seesaw guide

5233 quarter ORIG 2021 09

Back in stock and shipping now!


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 30,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — Savannah tells the story of the supply chain crisis in the U.S.

Wearables — Feathers from leather

Electronics — Get Oriented!

Python for Microcontrollers — Python on Microcontrollers Newsletter: Events, Projects, and much more! #Python #Adafruit #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — No-Code IoT with WipperSnapper, Beaming Internet across the Congo, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 10/20/21 feat. DIN Rail 10×10 to Terminal Block Adapter!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.