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Low voltage alert #38

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Low voltage alert #38

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ce32aa3
Update VarioSettings.h
GTorreil Apr 28, 2020
442566d
Update variometer.ino
GTorreil Apr 28, 2020
9b0cf26
Fix low-voltage check interval
GTorreil Apr 28, 2020
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7 changes: 6 additions & 1 deletion libraries/VarioSettings/VarioSettings.h
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,10 @@
//#define VARIOMETER_ENABLE_NEAR_CLIMBING_ALARM
//#define VARIOMETER_ENABLE_NEAR_CLIMBING_BEEP

// Reminder beeps on low battery
#define HAVE_LOW_BATTERY_BEEP
#define BATTERY_BEEPS_INTERVAL 30000 // 30000 for prod
#define LOW_BATT_BEEP_THRESOLD 3350 // low voltage thresold in mV

/*******************/
/* Screen behavior */
Expand Down Expand Up @@ -147,7 +151,8 @@
#define HAVE_GPS
#define HAVE_SDCARD
#define HAVE_BLUETOOTH
#define HAVE_VOLTAGE_DIVISOR
//#define HAVE_VOLTAGE_DIVISOR
#define HAVE_INTERNAL_VOLTMETER // For 5V chips powered straight from battery

/* ms5611 parameters */
/* You can set the calibration coefficients if known */
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61 changes: 61 additions & 0 deletions variometer/variometer.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -279,6 +279,13 @@ void beeperTapCallback(unsigned char direction, unsigned char count) {
#endif //defined(HAVE_ACCELEROMETER) && defined(HAVE_SPEAKER)


/*********************/
/* Low voltage beep */
/*********************/
#ifdef HAVE_LOW_BATTERY_BEEP
unsigned long batteryBeeps_lastrun;
#endi

/*-----------------*/
/* SETUP */
/*-----------------*/
Expand Down Expand Up @@ -639,9 +646,63 @@ void loop() {
varioScreen.displayStep();

#endif //HAVE_SCREEN

#ifdef HAVE_LOW_BATTERY_BEEP
makeBatteryBeeps();
#endif

}

#ifdef HAVE_LOW_BATTERY_BEEP
void makeBatteryBeeps(){
if ( millis() - batteryBeeps_lastrun > BATTERY_BEEPS_INTERVAL ){
batteryBeeps_lastrun = millis();
#ifdef HAVE_VOLTAGE_DIVISOR
// To be implemented
#endif // HAVE_VOLTAGE_DIVISOR
#ifdef HAVE_INTERNAL_VOLTMETER
if (readVcc() < LOW_BATT_BEEP_THRESOLD)
{
for (char i = 0; i < 5; i++)
{
toneAC(1000,10);
delay(50);
toneAC(0,0);
delay(50);
}

}
#endif //HAVE_INTERNAL_VOLTMETER

}
}

long readVcc() {
// Read 1.1V reference against AVcc
// set the reference to Vcc and the measurement to the internal 1.1V reference
#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
#elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
ADMUX = _BV(MUX5) | _BV(MUX0);
#elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
ADMUX = _BV(MUX3) | _BV(MUX2);
#else
ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
#endif

delay(2); // Wait for Vref to settle
ADCSRA |= _BV(ADSC); // Start conversion
while (bit_is_set(ADCSRA,ADSC)); // measuring

uint8_t low = ADCL; // must read ADCL first - it then locks ADCH
uint8_t high = ADCH; // unlocks both

long result = (high<<8) | low;

result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
return result; // Vcc in millivolts
}
#endif // HAVE_LOW_BATTERY_BEEP

#if defined(HAVE_SDCARD) && defined(HAVE_GPS)
void createSDCardTrackFile(void) {
Expand Down