OnStepSTM32_system

This board does not run OnStepX well (for Telescope Mount control) due to the STM32F103C8 (128KB version) where flash memory size is a severe constraint so using OnStep release 4.24 is recommended unless you can get your hands on an STM32F303 based Bluepill.

Overview and Objectives

The STM32 OnStep was conceived with these objectives in mind:

Low Cost, using inexpensive commodity components available from multiple sources on eBay, AliExpress and other marketplaces.
Moderately fast, this board can use two MCU's and the STM32F103C8T6 (original "Blue Pill") has generally acceptable performance, but the STM32F303CC is even faster similar to an ESP32 for our purposes.
Relative Ease of Build, avoiding discrete components as much as practical.
Real Time Clock, as a result of using an RTC module with EEPROM, the STM32 will keep the date and time indefinitely.

OnStep was ported to the STM32 platform by Khalid Baheyeldin, with valuable assistance provided by many people, including author of Onstep Howard Dutton, Dave Schwartz, Pierluigi Giorgi, and others

https://onstep.groups.io/g/main/wiki/6408