75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/*
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Battery.cpp - Battery library
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Copyright (c) 2014 Roberto Lo Giacco.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "Battery.h"
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#include <Arduino.h>
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Battery::Battery(uint16_t minVoltage, uint16_t maxVoltage, uint8_t sensePin) {
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this->sensePin = sensePin;
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this->activationPin = 0xFF;
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this->minVoltage = minVoltage;
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this->maxVoltage = maxVoltage;
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}
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void Battery::begin(uint16_t refVoltage, float dividerRatio, mapFn_t mapFunction) {
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this->refVoltage = refVoltage;
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this->dividerRatio = dividerRatio;
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pinMode(this->sensePin, INPUT);
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if (this->activationPin < 0xFF) {
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pinMode(this->activationPin, OUTPUT);
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}
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this->mapFunction = mapFunction ? mapFunction : &linear;
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}
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void Battery::onDemand(uint8_t activationPin, uint8_t activationMode) {
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if (activationPin < 0xFF) {
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this->activationPin = activationPin;
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this->activationMode = activationMode;
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pinMode(this->activationPin, OUTPUT);
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digitalWrite(activationPin, !activationMode);
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}
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}
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uint8_t Battery::level() {
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return this->level(this->voltage());
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}
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uint8_t Battery::level(uint16_t voltage) {
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if (voltage <= minVoltage) {
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return 0;
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} else if (voltage >= maxVoltage) {
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return 100;
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} else {
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return (*mapFunction)(voltage, minVoltage, maxVoltage);
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}
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}
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uint16_t Battery::voltage() {
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if (activationPin != 0xFF) {
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digitalWrite(activationPin, activationMode);
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delayMicroseconds(10); // copes with slow switching activation circuits
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}
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analogRead(sensePin);
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delay(2); // allow the ADC to stabilize
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uint16_t reading = analogRead(sensePin) * dividerRatio * refVoltage / 1024;
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if (activationPin != 0xFF) {
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digitalWrite(activationPin, !activationMode);
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}
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return reading;
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}
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