Automatic Solar Powered Chicken Door

1// pins
2const int solarTensionPin = A2;
3const int motorPin1 = 2;
4const  int motorPin2 = 3;
5const int switchMotorPin = 4;
6const int magneticSensorDoorClosedPin  = 5;
7const int magneticSensorDoorOpenPin = 6;
8
9// constants
10const int  numSamples = 10;
11const int triggeringEventCountLimit = 2;
12const float solarVoltageThreshold  = 2.0;
13const int maxTimeMotorRotation = 15000; // 15s
14
15// variables
16bool  doorOpen = false;
17int triggeringEventCount = 0;
18bool ligthUp = false;
19
20void  setup() {
21  //Serial.begin(9600);
22  pinMode(motorPin1, OUTPUT);
23  pinMode(motorPin2,  OUTPUT);
24  pinMode(switchMotorPin, OUTPUT);
25  pinMode(magneticSensorDoorClosedPin,  INPUT_PULLUP);
26  pinMode(magneticSensorDoorOpenPin, INPUT_PULLUP);
27}
28
29void  loop() {
30    ligthUp = false;
31    if (getSolarVoltage() > solarVoltageThreshold)  {
32      ligthUp = true;
33    }
34    
35    // a triggering event is night  when the door is open or day when the door is open
36    // This condition is XOR  : ^
37    if (doorOpen ^ ligthUp) {
38      triggeringEventCount++;
39    } else  {
40      triggeringEventCount = 0;
41    }
42
43    //Serial.println(triggeringEventCount);
44    // After three triggering event, you switch the door.
45    if (triggeringEventCount  > triggeringEventCountLimit) {
46      triggeringEventCount = 0;
47      switchDoor();
48    }
49    delay(120000); //cycle every 2min
50}
51
52float getSolarVoltage()
53{
54    int sum = 0;
55    float voltage = 0.0;
56    for (int sampleCount = 0; sampleCount  < numSamples; sampleCount++) {
57      sum += analogRead(solarTensionPin);
58      delay(100);
59    }
60    // We divide the sum by the number of samples  to get the average value.
61    // The average value measured is between 0 and  1024. 1024 represent 5V.
62    // So we multiply the measured by 5 and divide the  result by 1024.
63    voltage = ((float)sum / (float)numSamples * 5.0) / 1024.0;
64    // time 2 because voltage mesured = real voltage * R1/(R1+R2) = real voltage  * 10/20 = real voltage / 2
65    return voltage * 2;
66}
67
68void switchDoor()
69{
70  unsigned long start = millis();
71  int sensor = doorOpen ? magneticSensorDoorClosedPin  : magneticSensorDoorOpenPin;
72  int pin1 = doorOpen ? motorPin1 : motorPin2;
73  int pin2 = doorOpen ? motorPin2 : motorPin1;
74
75  // activate motor
76  digitalWrite(switchMotorPin,  HIGH);
77  digitalWrite(pin1, HIGH);
78  digitalWrite(pin2, LOW);
79  
80  while(digitalRead(sensor)  == HIGH && (unsigned long)(millis() - start) < maxTimeMotorRotation) {    
81    delay(10);
82  }
83  
84  //turn off motor
85  digitalWrite(motorPin1, LOW);
86  digitalWrite(motorPin2,  LOW);
87  digitalWrite(switchMotorPin, LOW);
88  
89  doorOpen = !doorOpen;
90  
91}