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ACS7xx_Allegro.cpp
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ACS7xx_Allegro.cpp
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/**************************************************************************/
/*!
@file CurrentIC_ACS7xx_Allegro.cpp
@author SOSAndroid (E. Ha.)
@license BSD (see license.txt)
Set of methods to use measurements from ACS7xx sensors from Allegro Micro
All those methods are made to be called periodically
@section HISTORY
v1.0 - First release
V1.1 - Moving exponential average + robustness
v1.2 - Modify the constructor call to avoid some errors
v1.2.1 - Fix issue #1
*/
/**************************************************************************/
#include <stdlib.h>
#include "ACS7xx_Allegro.h"
/*========================================================================*/
/* CONSTRUCTORS */
/*========================================================================*/
/**************************************************************************/
/*!
Constructor
*/
/**************************************************************************/
ACS7XX_ALLEGRO::ACS7XX_ALLEGRO(void)
{
_bidir = ACS7XX_BIDIR_DEFAULT;
_pintoread = ACS7XX_PIN_DEFAULT;
_sensitivity = ACS7XX_SENSITIVITY_DEFAULT;
_voltage = BOARD_VOLTAGE_DEFAULT;
}
ACS7XX_ALLEGRO::ACS7XX_ALLEGRO(boolean bidir, int pintoread, double voltage, double sensitivity)
{
_bidir = bidir;
_pintoread = pintoread;
_sensitivity = sensitivity;
_voltage = voltage;
}
/*========================================================================*/
/* PUBLIC FUNCTIONS */
/*========================================================================*/
void ACS7XX_ALLEGRO::begin(void) {
if (_bidir) {
_voltage_offset = _voltage / 2.0;
}
else {
_voltage_offset = 0.0;
}
_resolution = (double) BOARD_ADC_DEPTH;
_adc_offset = (int) BOARD_MEASURED_OFFSET;
_factor_value = (double) ACS7XX_FACTOR_VALUE;
_lastMillis = 0; //need to add a function to start the counting by initializing lastmillis when starting a discharge / charge cycle
_lastCurrent = 0.0;
_AHCounter = 0.0;
_CoulombCounter = 0.0;
_movavgexp_alpha = 2.0 / (EXP_MOVAVG_N + 1.0);
_movavgexp_loop = 0;
_movavgexp_val = 0.0;
#ifdef SERIAL_DEBUG
if(!Serial) {
Serial.begin(9600);
}
#endif
return;
}
void ACS7XX_ALLEGRO::instantCurrent(double *current)
{
int readvalue = analogRead(_pintoread) + _adc_offset;
double readvolt = (((double) readvalue / _resolution) * _voltage) - _voltage_offset;
double readcur = readvolt * _factor_value / _sensitivity;
*current = readcur;
_lastCurrent = readcur;
ACS7XX_ALLEGRO::movingAvgExp(readcur);
#ifdef SERIAL_DEBUG
if (Serial){
Serial.print("Read value on pin including offset: ");
Serial.println(readvalue, DEC);
Serial.print("Current: ");
Serial.print(readcur, DEC);
Serial.println(" mA");
Serial.print("Moving average: ");
Serial.print(ACS7XX_ALLEGRO::getMovingAvgExp(), DEC);
Serial.println(" mA");
}
#endif
return;
}
void ACS7XX_ALLEGRO::ampereHourCount(double *mamperehc)
{
unsigned long currentmillis = millis();
double timeframehour = (double)(currentmillis - _lastMillis) / 3600000.0;
double readcurrent;
ACS7XX_ALLEGRO::instantCurrent(&readcurrent);
*mamperehc = readcurrent * timeframehour;
_lastMillis = currentmillis;
#ifdef SERIAL_DEBUG
if (Serial){
Serial.print("AmpHour: ");
Serial.print(*mamperehc, DEC);
Serial.println(" mAh");
Serial.print("timeframe ");
Serial.print(timeframehour, DEC);
Serial.println(" hour");
}
#endif
return;
}
void ACS7XX_ALLEGRO::updateCounters(void)
{
double amperehcTemp;
ACS7XX_ALLEGRO::ampereHourCount(&erehcTemp);
_lastAmperehour = amperehcTemp;
_AHCounter += amperehcTemp;
_lastCoulomb = amperehcTemp * 3.6;
_CoulombCounter += _lastCoulomb;
#ifdef SERIAL_DEBUG
if (Serial){
Serial.print("mAH counter ");
Serial.print(_AHCounter, DEC);
Serial.println(" mAH");
Serial.print("Coulomb counter ");
Serial.print(_CoulombCounter, DEC);
Serial.println(" C");
Serial.println("Counters updated");
}
#endif
return;
}
void ACS7XX_ALLEGRO::resetCounters(void)
{
_lastAmperehour = 0.0;
_AHCounter = 0.0;
_lastCoulomb = 0.0;
_CoulombCounter = 0.0;
#ifdef SERIAL_DEBUG
if (Serial){
Serial.println("Counters reseted");
}
#endif
return;
}
void ACS7XX_ALLEGRO::updateMillis(void)
{
_lastMillis = millis();
#ifdef SERIAL_DEBUG
if (Serial){
Serial.println("Millis updated");
}
#endif
return;
}
void ACS7XX_ALLEGRO::getAHCount(double *ahcount)
{
*ahcount = _AHCounter;
return;
}
void ACS7XX_ALLEGRO::getCoulombCount(double *ccount)
{
*ccount = _CoulombCounter;
return;
}
void ACS7XX_ALLEGRO::printDebugDeviceInit(void)
{
#ifdef SERIAL_DEBUG
if (Serial){
Serial.println("ACS7XX sensor object initialized");
Serial.print("PIN: ");
Serial.println(_pintoread, DEC);
Serial.print("Sensitivity: ");
Serial.print(_sensitivity, DEC);
Serial.println(" V/A");
Serial.print("device is ");
if(!_bidir) Serial.print("not ");
Serial.println("bidirectional");
Serial.println("...... ...... ......");
}
#endif
return;
}
void ACS7XX_ALLEGRO::movingAvgExp(double current) {
//init moving average exponetial with simple average of
if (_movavgexp_loop < EXP_MOVAVG_LOOP) {
_movavgexp_val += current;
if (_movavgexp_loop == (EXP_MOVAVG_LOOP - 1)) _movavgexp_val = _movavgexp_val / (double) EXP_MOVAVG_LOOP;
_movavgexp_loop ++;
}
else {
double movavgexp = _movavgexp_val + _movavgexp_alpha * (current - _movavgexp_val);
_movavgexp_val = movavgexp;
}
return;
}
double ACS7XX_ALLEGRO::getMovingAvgExp(void) {
return _movavgexp_val;
}
void ACS7XX_ALLEGRO::resetMovingAvgExp(void) {
_movavgexp_val = 0;
_movavgexp_loop = 0;
return;
}