OnStep Telescope Controller on cheap $2.50 STM32 ARM Cortex M3 Board

Update: The information in this video has been superceded by newer videos. Please click on my name before the video and view the newer ones. This is a short video to demonstrate the port of the OnStep Telescope Controller firmware to a cheap $2.50 STM32 ARM Cortex M3 Board. This is cheaper yet faster than the Arduino Mega 2560. The STM32 port for OnStep does not work yet with EEPROM flash emulation provided by the STM32Duino project. I had to comment out one line of code to make OnStep work. The solution that I came up with is to use a DS3231 RTC ($1.50 on eBay) with a 32K EEPROM I2C chip. Waiting for it to be delivered so I can test and modify the code. Apologies for the occasional noise (e.g. 2:22), I had to go to the local Maker Space to use their oscilloscope, and they are quite busy. The square wave measured at 6:09 on the oscilloscope was from the wrong pin (LED pin, instead of Axi1 Step pin). Apologies for that part. To learn more about OnStep Telescope Controller, and this STM32 board, here are the links: More up to date information here https://groups.io/g/onstep/wiki/STM32F103-Blue-Pill STM32F103C8T6 "Black Pill" Board is an STM32 ARM Cortex M3 Board that sells for $2.50, running at 72MHz, with 128KB of flash storage, and 20KB of RAM.