ardupilot/libraries/APO/AP_BatteryMonitor.h

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/*
* AP_BatteryMonitor.h
*
*/
#ifndef AP_BATTERYMONITOR_H_
#define AP_BATTERYMONITOR_H_
#include <inttypes.h>
#include <wiring.h>
namespace apo {
class AP_BatteryMonitor {
public:
AP_BatteryMonitor(uint8_t pin, float voltageDivRatio, float minVolt, float maxVolt) :
_pin(pin), _voltageDivRatio(voltageDivRatio),
_minVolt(minVolt), _maxVolt(maxVolt), _voltage(maxVolt) {
}
void update() {
// low pass filter on voltage
_voltage = _voltage*.9 + (analogRead(_pin)/255)*_voltageDivRatio*0.1;
}
/**
* Accessors
*/
float getVoltage() {
return _voltage;
}
uint8_t getPercentage() {
float norm = (_voltage-_minVolt)/(_maxVolt-_minVolt);
if (norm < 0) norm = 0;
else if (norm > 1) norm = 1;
return 100*norm;
}
private:
uint8_t _pin;
float _voltageDivRatio;
float _voltage;
float _minVolt;
float _maxVolt;
};
} // namespace apo
#endif /* AP_BATTERYMONITOR_H_ */