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/**
* Arduino lipo battery discharger to storage minimumVoltage=3.85v
* For this you need :
* - arduino board. I used arduino micro
* - voltage sensor - http://www.aliexpress.com/store/product/10pcs-New-Voltage-Sensor-Module-For-Robot-Arduino/341125_1352801407.html
* - relay shield - http://www.aliexpress.com/item/2-Channel-2-channel-2-way-5V-Relay-Shield-Module-for-ARM-PIC-AVR-DSP/1971554348.html
*/
#include <Wire.h>
#define VOLTAGEPIN 1
#define RELAYPIN 4
int debug = 1;
float voltage;
float minimumVoltage = 3.85;
int timesUnderMinimumVoltage = 0;
int maxUnderMinimumVoltage = 10;
bool relayActivated = false;
int i = 0, totalVoltages=120;
bool passTotalVotages = false;
float voltages[120];
void setup()
{
if ( debug ) {
Serial.begin(9600);
}
if ( debug >= 3 ) {
Serial.println("Voltage: x.xx V");
}
pinMode(RELAYPIN, OUTPUT);
}
void loop()
{
int analogValue;
float voltageTemp;
analogValue=analogRead(VOLTAGEPIN);
if ( debug >= 3 ) {
Serial.print("analogValue : ");
Serial.println(analogValue);
}
voltageTemp=analogValue/4.092/10;
if ( debug >= 1 ) {
Serial.print("Voltage : ");
Serial.print(voltageTemp);
Serial.println(" V");
}
voltages[i] = voltageTemp;
voltage = calcAverageVoltage ();
if ( debug >= 1 ) {
Serial.print("Voltage average : ");
Serial.print(voltage);
Serial.println(" V");
}
if ( relayActivated == false ) {
if ( voltage <= minimumVoltage ) {
timesUnderMinimumVoltage++;
if ( debug >= 2) {
Serial.print("timesUnderMinimumVoltage : ");
Serial.println(timesUnderMinimumVoltage);
}
} else if ( voltage > minimumVoltage && timesUnderMinimumVoltage > 0 ) {
timesUnderMinimumVoltage--;
if ( debug >= 2) {
Serial.print("timesUnderMinimumVoltage : ");
Serial.println(timesUnderMinimumVoltage);
}
}
if ( timesUnderMinimumVoltage >= maxUnderMinimumVoltage ) {
relayActivated = true;
digitalWrite(RELAYPIN, HIGH);
if ( debug >= 1 ) {
Serial.println("Send signal to relay to disconnect battery");
}
}
} else {
if ( debug >= 2) {
Serial.print("timesUnderMinimumVoltage : ");
Serial.println(timesUnderMinimumVoltage);
}
if ( voltage > minimumVoltage && timesUnderMinimumVoltage > 0 ) {
timesUnderMinimumVoltage--;
}
if ( timesUnderMinimumVoltage == 0 ) {
relayActivated = false;
digitalWrite(RELAYPIN, LOW);
if ( debug >= 1 ) {
Serial.println("Send signal to relay to reconnect battery");
}
}
}
i++;
if (i>totalVoltages) {
i = 0;
passTotalVotages = true;
}
delay(500);
}
float calcAverageVoltage () {
int _j; float _sum = 0.0;
for (_j=0;_j<totalVoltages;_j++) {
_sum+= (float) voltages[_j];
}
if ( i < totalVoltages && passTotalVotages == false ) {
return _sum/i;
} else {
return _sum/totalVoltages;
}
}
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