OnStep Telescope Controller based on the STM32 ARM Cortex M3 microcontroller 'Blue Pill' board.
Designed by Dave Schwartz and Khalid Baheyeldin.
More info on OnStep here: https://groups.io/g/onstep/wiki/Home
Before ordering this PCB, or using the schematic, you must read this page carefully, and in its entirity.
STM32 OnStep here: https://groups.io/g/onstep/wiki/STM32F103-Blue-Pill