DigitalInfinity/ESP32-PaxCounter
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Heltecv2 battery monitor

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This commit is contained in:
Verkehrsrot 2019-09-08 12:55:27 +02:00
parent bbc2592552
commit 81f1bc5c70
2 changed files with 24 additions and 9 deletions
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5
src/hal/heltecv2.h
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@ -20,8 +20,9 @@
#define HAS_LED LED_BUILTIN // white LED on board
#define HAS_BUTTON KEY_BUILTIN // button "PROG" on board
//#define BAT_MEASURE_ADC ADC2_GPIO13_CHANNEL // battery probe GPIO pin
//#define BAT_VOLTAGE_DIVIDER 4 // voltage divider 220k/100k on board
#define BAT_MEASURE_ADC ADC2_GPIO13_CHANNEL // battery probe GPIO pin
#define BAT_MEASURE_ADC_UNIT 2 // ADC 2
#define BAT_VOLTAGE_DIVIDER 2 // voltage divider 220k/100k on board
#define EXT_POWER_SW Vext // switches battery power, Vext control 0 = on / 1 = off
#define EXT_POWER_ON 0
//#define EXT_POWER_OFF 1

24
src/power.cpp
View File

@ -49,16 +49,26 @@ esp_adc_cal_characteristics_t *adc_characs =
(esp_adc_cal_characteristics_t *)calloc(
1, sizeof(esp_adc_cal_characteristics_t));
#ifndef BAT_MEASURE_ADC_UNIT // ADC1
static const adc1_channel_t adc_channel = BAT_MEASURE_ADC;
#else // ADC2
static const adc2_channel_t adc_channel = BAT_MEASURE_ADC;
#endif
static const adc_atten_t atten = ADC_ATTEN_DB_11;
static const adc_unit_t unit = ADC_UNIT_1;
#endif
#endif // BAT_MEASURE_ADC
void calibrate_voltage(void) {
#ifdef BAT_MEASURE_ADC
// configure ADC
#ifndef BAT_MEASURE_ADC_UNIT // ADC1
ESP_ERROR_CHECK(adc1_config_width(ADC_WIDTH_BIT_12));
ESP_ERROR_CHECK(adc1_config_channel_atten(adc_channel, atten));
#else // ADC2
// ESP_ERROR_CHECK(adc2_config_width(ADC_WIDTH_BIT_12));
ESP_ERROR_CHECK(adc2_config_channel_atten(adc_channel, atten));
#endif
// calibrate ADC
esp_adc_cal_value_t val_type = esp_adc_cal_characterize(
unit, atten, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_characs);
@ -75,7 +85,6 @@ void calibrate_voltage(void) {
#endif
}
uint8_t getBattLevel() {
/*
return values:
@ -102,7 +111,6 @@ uint8_t getBattLevel() {
// u1_t os_getBattLevel(void) { return getBattLevel(); };
uint16_t read_voltage() {
uint16_t voltage = 0;
@ -114,17 +122,23 @@ uint16_t read_voltage() {
#ifdef BAT_MEASURE_ADC
// multisample ADC
uint32_t adc_reading = 0;
int adc_buf = 0;
for (int i = 0; i < NO_OF_SAMPLES; i++) {
#ifndef BAT_MEASURE_ADC_UNIT // ADC1
adc_reading += adc1_get_raw(adc_channel);
#else // ADC2
ESP_ERROR_CHECK(adc2_get_raw(adc_channel, ADC_WIDTH_BIT_12, &adc_buf));
adc_reading += adc_buf;
#endif
}
adc_reading /= NO_OF_SAMPLES;
// Convert ADC reading to voltage in mV
voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_characs);
#endif
#endif // BAT_MEASURE_ADC
#ifdef BAT_VOLTAGE_DIVIDER
voltage *= BAT_VOLTAGE_DIVIDER;
#endif
#endif // BAT_VOLTAGE_DIVIDER
#endif // HAS_PMU