Hedgehog is a Klipper expansion PCB with 31 I/O pins, designed for cases when you just need a simple board to connect a few things to your printer, like pins for buttons, thermistors, I2C/SPI devices, etc.
Hedgehog, unlike generic MCU breakout boards, is designed with ease-of-use with Klipper in mind:
Are you wiring a bunch of buttons and don't want to join many wires to one pin? Hedgehog has a pair of 3.3V and GND for each pin.
Do you want to use CAN bus, and don't want to wire a separate CAN module? Hedgehog has a CAN transceiver built-in, and supports both USB and CAN.
Do you only have 24V available where you're planning to place the board? No problem, Hedgehog supports 24VIN.
Do you want to connect a few thermistors, and don't want to solder pullup resistors? Hedgehog as pullups and protection for 3 thermistors built-in.
Are you designing a custom board for your application and need a simple MCU breakout board to slot into your design? Hedgehog uses standard 2.54mm (0.1") pitch pin headers for its I/O, so you can easily slot it into standard female headers on your design.
Hedgehog uses a STM32G0B1 MCU, supporting Klipper, STM32Duino and many other firmwares.
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