SunTracker SolarPanel - Arduino UNO

1#include <LiquidCrystal_I2C.h>
2#include <Servo.h>
3
4LiquidCrystal_I2C lcd(0x27, 16, 2);  //LCD setup
5
6//LDRS Pin connection
7const int LDR_TOP_LEFT = A4;
8const int LDR_TOP_RIGHT = A3;
9const int LDR_BOTTOM_LEFT = A2;
10const int LDR_BOTTOM_RIGHT = A1;
11
12const int LIGHT_THRESHOLD = 75; //change by need, makes the ldrs more sensetive
13
14//Servos
15Servo servo_horizontal;
16Servo servo_vertical;
17int pos_sh = 90;
18int pos_sv = 90;
19const int UPPER_LIMIT_POS = 160;  //Upper Servo limit
20const int LOWER_LIMIT_POS = 20;   //Lower Servo limit
21
22//Voltage measure
23#define Voltage_pin A0
24float input_voltage = 0;
25float real_voltage = 0;
26
27void setup() {
28  //Serial.begin(9600); //enable to check if ldrs properly working
29  pinMode(A0,INPUT);
30  pinMode(A1,INPUT);
31  pinMode(A2,INPUT);
32  pinMode(A3,INPUT);
33  pinMode(A4,INPUT);
34  pinMode(9,OUTPUT);
35  pinMode(13,OUTPUT);
36
37  lcd.init();
38  lcd.backlight();
39  lcd.clear();
40  delay(100);
41  lcd.setCursor(0,0);
42  lcd.print("SolarPanel");
43  lcd.setCursor(0,1);
44  lcd.print("Project by halkin");
45  delay(2000);
46  lcd.clear();
47  servo_vertical.attach(9);
48  servo_horizontal.attach(13);
49  delay(100);
50  servo_vertical.write(50);
51  servo_horizontal.write(80);
52  delay(500);
53}
54
55void loop() {
56  //reading and calculating sun position
57  int ldr_tl_value = analogRead(LDR_TOP_LEFT);
58  int ldr_tr_value = analogRead(LDR_TOP_RIGHT);
59  int ldr_bl_value = analogRead(LDR_BOTTOM_LEFT);
60  int ldr_br_value = analogRead(LDR_BOTTOM_RIGHT);
61
62  int average_top = (ldr_tl_value + ldr_tr_value) / 2; //average top ldrs
63  int average_bottom = (ldr_bl_value + ldr_br_value) / 2; //average botom ldrs
64  int average_left = (ldr_tl_value + ldr_bl_value) / 2; //average left ldrs
65  int average_right = (ldr_tr_value + ldr_br_value) / 2; //average right ldrs
66  //masuring Voltage on panel and dispaling on lsd
67  voltageMeasure();
68  //void to move panel directly on sun
69  moveSolarTracker(average_top, average_bottom, average_left, average_right);
70  
71}
72
73void moveSolarTracker(int average_top, int average_bottom, int average_left, int average_right) {
74  /*
75  //Ldrs checker
76  Serial.print("top;"); Serial.println(average_top);
77  Serial.print("bottom;");  Serial.println(average_bottom);
78  Serial.print("left;");  Serial.println(average_left);
79  Serial.print("right;"); Serial.println(average_right);
80  Serial.println("");
81  */
82
83  //movement Horizontal(left or right)
84  if ((average_left - average_right) > LIGHT_THRESHOLD && pos_sh < UPPER_LIMIT_POS) {
85    pos_sh--;
86    servo_horizontal.write(pos_sh);
87  }
88  else if ((average_right - average_left) > LIGHT_THRESHOLD && pos_sh > LOWER_LIMIT_POS) {
89    pos_sh++;
90    servo_horizontal.write(pos_sh);
91  }
92  //movement Vertical(up or down)
93  if ((average_top - average_bottom) > LIGHT_THRESHOLD && pos_sv < UPPER_LIMIT_POS) {
94    pos_sv++;
95    servo_vertical.write(pos_sv);
96  }
97  else if ((average_bottom - average_top) > LIGHT_THRESHOLD && pos_sv > LOWER_LIMIT_POS) {
98    pos_sv--;
99    servo_vertical.write(pos_sv);
100  }
101
102}
103
104void voltageMeasure(){
105  input_voltage = analogRead(Voltage_pin);
106  real_voltage = 3*((input_voltage*5.0)/1024);//input voltage decreased by voltage divider, so we calculate it to be acurate.
107  lcd.setCursor(0,0);
108  lcd.print("Voltage:");
109  lcd.setCursor(9,0);
110  lcd.print(real_voltage);
111  lcd.setCursor(13,0);
112  lcd.print("v");
113  delay(500);
114}