Wide Operation Buck Boost and Automation pHat (WOBBApHAT)
* RPi Zero-sized pHAT
* bi-directional level shifting for RFID Reader I/O (UART), PWM, and switch inputs (GPIO)
* 12-24V strike power from on-board boost or aux input
* (optionally) 5V RPi power from 12-24V source
Design details and software support at https://github.com/ihartwig/amtdoor3.