A small library to measure the voltage level on the VSYS pin of a Raspberry Pi Pico. Useful for battery-powered projects.
The included example turns the onboard LED on when the voltage provided is below 3.25V.
// Initialize the measurement. Make sure to initialize the ADC before calling this.
// Set delay_ms to 0 and the callbacks to NULL to disable the repeating timer.
void battery_check_init(int delay_ms, void* repeat_callback, void* low_callback)
// Called periodically according to the timer set on initialization
void battery_check_callback(uint16_t battery_mv)
// Called once, as soon as the detected voltage falls below the threshold
void battery_low_callback(uint16_t battery_mv)
// Set the low threshold. Default is 3250mv.
void battery_set_threshold(uint16_t mv)
// Stop the measurement by canceling the repeating timer
void battery_check_stop()
// Direct measurement
uint16_t battery_mv = battery_check();An example application is provided.
- 2023.11.28 - v1.2.0 - Added battery_check function for one-shot checks
- 2023.09.29 - v1.1.0 - Added more public functions. Breaking changes.
- 2023.03.26 - v1.0.0 - First release