The scarp project, named like it's brethren, rampart and keep (aka. moat) is an experimental, open hardware design.
UPDATE, Aug. 28, 2026. New layout to be able to use 2 pin silicon 8mm buttons.
It can include a 4pin I2C display. Or a three pin I2S DAC. All the pins on the pico are exposed and you can add headers to use them.
The board uses all GPIO. 8 buttons, 8 leds, 2 pots and an encoder.
The firmware directory includes a number of types of firmware. You'll be able to do work with the bare pico sdk, circuitpython, or arduino.
Include examples for
- NEW 05.2025 a port of Mutable instruments braids to scarp. Requires the STMLIB and BRAIDS libraries from https://github.com/poetaster/arduinoMI/
- Mozzi library based c++.
- Arduino PWM pikobeats variant.
- pikocore The scarp branch here: https://github.com/poetaster/pikocore/tree/scarp allows you to play the pikocore firmware, with some tweaks to adapt to this hardware layout.
- circuitpython - There is also an elaborate circuitpython audio example based on todbots https://github.com/todbot/picostepseq but including audio output ;)
I sell my tonetoys synths at https://poetaster.org or on etsy at https://tonetoys.etsy.com, or Tindie :)
I've had a bunch of fun with:
A Drum sequencer for the Pikocore, https://github.com/poetaster/PikoBeats, derived from https://github.com/rheslip/PikoBeats .
This project was inspired by Teenage Engineering, pikocore designed by Zack Scholl https://infinitedigits.co/wares/pikocore/, the todbot circuit python audio stuff and his layouts for a simple sequencer. Please visit Zack's site to buy a Pikocore, a kit, or a PCB - its a really fun little sample glitcher.
THIS BOARD is in production and the first version, with only pwm output works really well!.
