65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
/**
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* @file battery.cpp
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* @author Alexander Klein (alex@kleiax.de)
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* @brief Contains the implementation of the class Battery
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* @version 0.1
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* @date 2022-02-05
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*
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* @copyright Copyright (c) 2022
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*
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*/
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#include "battery.h"
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Battery::Battery(uint8_t pin, uint32_t r1, uint32_t r2) {
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this->pin = pin;
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this->r1 = r1;
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this->r2 = r2;
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this->calculateBatteryVoltage();
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}
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void Battery::loop() {
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if (millis() - this->lastMillis < this->delay)
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return;
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this->calculateBatteryVoltage();
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this->calculateBatteryPercent();
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this->lastMillis = millis();
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}
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double Battery::readInputVoltage() {
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// Reference voltage is 3v3 so maximum reading is 3v3 = 4095 in range 0 to 4095
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double reading = analogRead(this->pin);
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if(reading < 1 || reading > 4095) return 0;
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return - 0.000000000000016 * pow(reading,4)
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+ 0.000000000118171 * pow(reading,3)
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- 0.000000301211691 * pow(reading,2)
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+ 0.001109019271794 * reading
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+ 0.034143524634089;
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}
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void Battery::calculateBatteryVoltage() {
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this->batteryVoltage = (readInputVoltage() * (double) (this->r1 + this->r2)) / (double) this->r2;
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}
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void Battery::calculateBatteryPercent() {
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int8_t size = sizeof(this->capacityVoltages) / sizeof(*this->capacityVoltages);
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uint8_t i;
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for (i = 0; i < size; i++) {
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if (this->batteryVoltage <= this->capacityVoltages[i])
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break;
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}
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if (i == 0) {
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std::cout << "Critical low battery!" << std::endl;
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} else if (i == size - 1) {
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} else {
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double diffToLowerVal = this->batteryVoltage - this->capacityVoltages[i - 1];
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double diffToHigherVal = this->capacityVoltages[i] - this->batteryVoltage;
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if (diffToLowerVal > diffToHigherVal)
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i--;
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}
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this->batteryPercent = i * (100 / (size - 1));
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}
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