RaptorXL4 is a custom breakout board I designed to prototype the Auto-Tuner.
It’s built around the STM32L431CBT6 and includes:
- 24 MHz HSE crystal
- On-board ST-LINK–compatible programmer/debugger
- User LED for quick “blinky” tests
- VDDA supply with ferrite bead filtering for cleaner ADC performance
- Access to most MCU pins for prototyping
- Cool raptor silkscreen
