/** * Copyright (c) 2022 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause */ #include <stdio.h> #include <pico/stdlib.h> #include <power_status.h> #include "hardware/adc.h" #include "pico/float.h" #if CYW43_USES_VSYS_PIN #include "pico/cyw43_arch.h" #endif int main() { stdio_init_all(); adc_init(); adc_set_temp_sensor_enabled(true); // Pico W uses a CYW43 pin to get VBUS so we need to initialise it #if CYW43_USES_VSYS_PIN if (cyw43_arch_init()) { printf("failed to initialise\n"); return 1; } #endif bool old_battery_status = false; bool battery_status = true; float old_voltage = -1; char *power_str = "UNKNOWN"; while(true) { // Get battery status if (power_source(&battery_status) == PICO_OK) { power_str = battery_status ? "BATTERY" : "POWERED"; } // Get voltage float voltage = 0; int voltage_return = power_voltage(&voltage); voltage = floorf(voltage * 100) / 100; // Display power if it's changed if (old_battery_status != battery_status || old_voltage != voltage) { char percent_buf[10] = {0}; if (battery_status && voltage_return == PICO_OK) { const float min_battery_volts = 3.0f; const float max_battery_volts = 4.2f; int percent_val = (int) (((voltage - min_battery_volts) / (max_battery_volts - min_battery_volts)) * 100); snprintf(percent_buf, sizeof(percent_buf), " (%d%%)", percent_val); } // Also get the temperature adc_select_input(4); const float conversionFactor = 3.3f / (1 << 12); float adc = (float)adc_read() * conversionFactor; float tempC = 27.0f - (adc - 0.706f) / 0.001721f; // Display power and remember old vales printf("Power %s, %.2fV%s, temp %.1f DegC\n", power_str, voltage, percent_buf, tempC); old_battery_status = battery_status; old_voltage = voltage; } sleep_ms(1000); } #if CYW43_USES_VSYS_PIN cyw43_arch_deinit(); #endif return 0; }

This firmware image was imported from the pico-examples repository. 


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