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GP8403 hardware tests

Each folder contains one self-contained sketch. No shared test headers or captured output files are required.

The fixture uses an Adafruit Metro Mini with the GP8403 connected to its I2C SDA and SCL pins and a shared ground. OUT0 connects through an equal 10 kOhm / 10 kOhm divider to A0, and OUT1 connects through another equal 10 kOhm / 10 kOhm divider to A1. The tests assume a 5 V ADC reference. Run 00_basic, 01_invalid_inputs, and 02_range_10v directly, in that order.

For 03_nvm_persistence, open the serial monitor at 115200 baud and follow this three-boot sequence:

  1. Send S to save 1 V / 2 V, then remove and restore all power.
  2. Send Z to verify 1 V / 2 V and save zero, then power cycle again.
  3. Send V to verify that zero was restored.