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Exposed GPIO

Back of the MSR-1 Rev 8 board with six GPIO pads labeled SLC, IO 5, 5V, GND, 3V3, and SDA

The back of the Apollo MSR-1 has exposed GPIO for a variety of uses.

From left to right:

  • SLC (Typo, should be SCL)
    • Used for I2C
  • IO 5
    • GPIO 5 of ESP32-C3-Mini
  • 5V
    • Used for powering the device, or powering an external sensor
  • GND
    • Ground
  • 3V3
    • Used to power external sensors. Can not power the MSR-1 from this
  • SDA
    • Used for I2C