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