For LEONIRD, we are using the PyCubed Hardware + Software stack.

The central board's schematics can be found here: https://github.com/pycubed/hardware.

This includes:

• 32-bit ARM M4 @ 120 MHz microprocessor
• Flash memory + Micro SD card slot
• Watch dog timer (automatically resets system in case of error)
• IMU
• Radio + 5V buck converter for radio
• 4.5V-18V → 3.3V buck converter
• Li-ion battery charger (compatible with solar)
• Burn wire (cool mechanism that keeps the antenna "folded" until the satellite deploys, upon which it springs out)
• Power monitor

The board can be controlled using the PyCubed software, found here: https://github.com/pycubed/software/blob/master/mainboard-v05/lib/pycubed.py

The GitHub repo pretty much only has code to initialize the board and gives the user free reign to design the flight software.