Klipper-Expander Board by Tim Abraham

Simple MCU board for use with Klipper 3D Printer firmware with:

• STM32F042F6P6 MCU with internal oscilator
• SWD (Serial Wire Debug) header for easy debugging
• 4 3A Mosfet outputs
• 2 Thermistor inputs
• 1 Level Shifted Neopixel output
• 1 GPIO header
• I2C Header with Pullup Resistors

More info can be here: Klipper-Exapander