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Add battery calibration values

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Pim van Pelt
2017-11-27 23:14:17 +01:00
parent 72f757a913
commit f87fec5ed0
2 changed files with 11 additions and 4 deletions
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13
src/widget_battery.c
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@ -1,5 +1,6 @@
#include "mgos.h"
#include "mgos_adc.h"
#include "mgos_config.h"
#include "tft.h"
#include "mongoose-touch.h"
#include "mgos_prometheus_metrics.h"
@ -8,11 +9,15 @@
#define WIDGET_BATTERY_ADC_PIN 35
// Returns millivolts - Huzzah32 has a 1:1 voltage divider on I35 (A13)
// so it returns half of the battery voltage. LiPo's are full at 4200mV
// and critically empty at 3000mV.
// so it returns half of the battery voltage. Calibrate the function by
// measuring the ADC output at 4000mV.
static int widget_battery_getvoltage() {
// Value is between 0..4096 which maps to 0..6600mV
return (6600*mgos_adc_read(WIDGET_BATTERY_ADC_PIN))/4096;
int val, mvolts;
val = mgos_adc_read(WIDGET_BATTERY_ADC_PIN);
mvolts=(4000*val)/mgos_sys_config_get_app_battery_calibration();
LOG(LL_DEBUG, ("ADC value %d, voltage %d mV", val, mvolts));
return mvolts;
}
static void widget_battery_render(struct widget_t *w, void *ev_data) {