12-5V Buck + ELRS RX: Test Plan

Verify no connector pins look soldered together

Verify no pins on ESP32/SX1281 look shorted

Solder on XT60-M and XT60-F connectors

Solder on 2.54mm pitch header pins for 5V/PWM

Verify pin 1 on chips aligns with indicator

Make sure no power rails are shorted to ground or each other with DMM

Verify the 5V output rail turns on (buck functionality)

Verify the internal 3.3V rail turns on (LDO functionality)

Slowly increase voltage (with low current limit, 100mA max) on buck input

Check for excessive current/power draw (ensuring no output load)

Optionally, measure potential when EN pin activates buck IC

Varies due to hysterisis, but ~5.2V

Probe the output net for voltage stability with DMM

Perform load test on buck converter: use an e-load to saturate the 5V rail to 4A rated maximum.

Optionally, load the 12V passthrough XT60-Fs.

Load transient testing: Step the e-load and view the transient response from buck converter output.

Battery inrush test: simulate hot-plugging a battery on the input terminal and view transient voltage spike/oscillations.

Use USB to UART adapter/FTDI cable to flash the bootloader onto the stock ESP32-C3.

Electrical