by Jeremy Gillick

Image of Board

A kick-ass microcontroller board with everything you need in a compact package that fits in your pocket. Integrated battery, power management system, Arm microcontroller, USB bootloader, 4 high-power PWM outputs, and 12 GPIOs.

Why? After years of wiring together portable LED controllers that all consisted of a lithum batter, charge controller, power switch, and an arduino nano (or similar), I wanted something better. I always found those versions to be janky and fragile – not to mention concerned that damaging the pouch cell battery might make it explode! This board has everything I need with room to expand.


  • Ultra-low-power 32-bit microcontroller (STM32L072xx)
  • Integrated high-capacity 18650 lithium battery
  • 4 high-current PWM outputs (2.3A per channel!) with an LED on each for debugging.
  • 12 GPIOs, USART, I2C, SPI, USB
  • 6k EEPROM
  • USB bootloader
  • Tactile on/off switch
  • Tactile user button with built-in debounce circuit
  • Breadboard friendly
  • Durable AF! (Put a tube of heat shrink around it for a super easy case, if you’d like.)

Learn More


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CircuitPython 6.0.1

This is the latest stable release of CircuitPython that will work with the Thunderpack.

Start here if you are new to CircuitPython.

Release Notes for 6.0.1

Built-in modules available: _pixelbuf, analogio, bitbangio, board, busio, digitalio, displayio, framebufferio, gamepad, math, microcontroller, neopixel_write, nvm, os, pulseio, pwmio, random, sdcardio, sharpdisplay, storage, struct, supervisor, terminalio, time, touchio, ulab, vectorio

Absolute Newest

Every time we commit new code to CircuitPython we automatically build binaries for each board and language. The binaries are stored on Amazon S3, organized by board, and then by language. Try them if you want the absolute latest and are feeling daring or want to see if a problem has been fixed.

Past Releases

All previous releases are listed on GitHub, with release notes, and are available for download from Amazon S3. They are handy for testing, but otherwise we recommend using the latest stable release. Some older GitHub release pages include the same binaries for downloading. But we have discontinued including binaries as assets on newer release pages because of the large number of files for each release.