In modern solar tracking systems, the solar panels are fixed on a structure that moves according to the position of the sun. In this project we are going to make a solar tracker using two servo motors, a light sensor consisting of four LDRs and Arduino UNO board. Okey,let's see how it works.
Components Required
| 1. | Arduino UNO | * 1 |
| 2. | Servomotor | * 1 |
| 3. | LDR | * 2 |
| 4. | Resistors(10K ohm) | * 2 |
| 5. | Battery(6 to 12V) | * 1 |
| 6. | Bread Board | * 1 |
| 7. | Jumper Wires | * 1 |
Circuit Diagram
Program
#include <Servo.h> //including the library of servo motor
Servo sg90; //initializing a variable for servo named sg90
int initial_position = 90; //Declaring the initial position at 90
int LDR1 = A0; //Pin at which LDR is connected
int LDR2 = A1; //Pin at which LDR is connected
int error = 5; //initializing variable for error
int servopin=9;
void setup()
{
sg90.attach(servopin); // attaches the servo on pin 9
pinMode(LDR1, INPUT); //Making the LDR pin as input
pinMode(LDR2, INPUT);
sg90.write(initial_position); //Move servo at 90 degree
delay(2000); // giving a delay of 2 seconds
}
void loop()
{
int R1 = analogRead(LDR1); // reading value from LDR 1
int R2 = analogRead(LDR2); // reading value from LDR 2
int diff1= abs(R1 - R2); // Calculating the difference between the LDR's
int diff2= abs(R2 - R1);
if((diff1 <= error) || (diff2 <= error)) {
//if the difference is under the error then do nothing
} else {
if(R1 > R2)
{
initial_position = --initial_position; //Move the servo towards 0 degree
}
if(R1 < R2)
{
initial_position = ++initial_position; //Move the servo towards 180 degree
}
}
sg90.write(initial_position); // write the position to servo
delay(100);
}