richonguzman/LoRa_APRS_iGate
1
0
Fork 0
mirror of https://github.com/richonguzman/LoRa_APRS_iGate.git synced 2026-04-07 15:36:24 +00:00
Code Issues Projects Releases Packages Wiki Activity

feat: battery voltage cutoff monitor

Browse source
This commit is contained in:
SQ2CPA 2024-03-21 17:31:54 +01:00
parent a44c6ca96c
commit 15be5fc611
6 changed files with 56 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

42
src/battery_utils.cpp
View file

@ -2,7 +2,13 @@
#include "configuration.h"
#include "pins_config.h"
// Uncomment if you want to monitor voltage and sleep if voltage is too low (<3.1V)
#define LOW_VOLTAGE_CUTOFF
float cutOffVoltage = 3.1;
extern Configuration Config;
extern uint32_t lastBatteryCheck;
float adcReadingTransformation = (3.3/4095);
float voltageDividerCorrection = 0.288;
@ -16,11 +22,15 @@ float multiplyCorrection = 0.035;
namespace BATTERY_Utils {
float mapVoltage(float voltage, float in_min, float in_max, float out_min, float out_max) {
return (voltage - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
float checkBattery() {
int sample;
int sampleSum = 0;
for (int i=0; i<100; i++) {
#if defined(TTGO_T_LORA32_V2_1) || defined(HELTEC_V2)
#if defined(TTGO_T_LORA32_V2_1) || defined(HELTEC_V2) || defined(HELTEC_WSL)
sample = analogRead(batteryPin);
#endif
#if defined(HELTEC_V3) || defined(ESP32_DIY_LoRa) || defined(ESP32_DIY_1W_LoRa)
@ -29,7 +39,12 @@ namespace BATTERY_Utils {
sampleSum += sample;
delayMicroseconds(50);
}
return (2 * (sampleSum/100) * adcReadingTransformation) + voltageDividerCorrection;
float voltage = (2 * (sampleSum/100) * adcReadingTransformation) + voltageDividerCorrection;
return voltage; // raw voltage without mapping
// return mapVoltage(voltage, 3.34, 4.71, 3.0, 4.2); // mapped voltage
}
float checkExternalVoltage() {
@ -40,7 +55,28 @@ namespace BATTERY_Utils {
sampleSum += sample;
delayMicroseconds(50);
}
return ((((sampleSum/100)* adcReadingTransformation) + readingCorrection) * ((R1+R2)/R2)) - multiplyCorrection;
float voltage = ((((sampleSum/100)* adcReadingTransformation) + readingCorrection) * ((R1+R2)/R2)) - multiplyCorrection;
return voltage; // raw voltage without mapping
// return mapVoltage(voltage, 5.05, 6.32, 4.5, 5.5); // mapped voltage
}
bool checkIfShouldSleep() {
#ifdef LOW_VOLTAGE_CUTOFF
if (lastBatteryCheck == 0 || millis() - lastBatteryCheck >= 15 * 60 * 1000) {
lastBatteryCheck = millis();
float voltage = checkBattery();
if (voltage < cutOffVoltage) {
return true;
}
}
#endif
return false;
}
}