Solar trackers

 

Solar trackers 

Components Details 

5mm Acrylic Sheet 30cm x 20cm,

1. VPC Card board 5mm, Arduino UNO,LDR Sensor x 2.
2. Mini Servo Motor SG90,
3. USB DC 1-5V to DC 5V Voltage Step Up Boost Module,
4. LiPo Battery Charger Module Mini TP4056 IC,
5. On/Off Switch,
6. 18650 Battery Holder - 1 Cell,
7. 18650 Battery Cell 3.7V

                             Code's 

#include <Servo.h> //includes the servo library

Servo myservo;

#define ldr1 A0 // set ldr 1 Analog input pin of East ldr as an integer

#define ldr2 A1 // set ldr 2 Analog input pin of West ldr as an integer

int pos = 90; // initial position of the Horizontal movement controlling servo motor

int tolerance = 20; // allowable tolerance setting - so solar servo motor isn't constantly in motion

void setup(){

myservo.attach(2); // attaches the servo on digital pin 2 to the horizontal movement servo motor

pinMode(ldr1, INPUT); //set East ldr pin as an input

pinMode(ldr2, INPUT); //set West ldr pin as an input

myservo.write(pos); // write the starting position of the horizontal movement servo motor

delay(1000); // 1 second delay to allow the solar panel to move to its staring position before comencing solar tracking

}

void loop(){

int val1 = analogRead(ldr1); // read the value of ldr 1

int val2 = analogRead(ldr2); // read the value of ldr 2

if((abs(val1 - val2) <= tolerance) || (abs(val2 - val1) <= tolerance)) {

//no servo motor horizontal movement will take place if the ldr value is within the allowable tolerance

}else {

if(val1 > val2) // if ldr1 senses more light than ldr2

{

pos = pos+1; // decrement the 90 degree poistion of the horizontal servo motor - this will move the panel position Eastward

}

if(val1 < val2) // if ldr2 senses more light than ldr1

{

pos = pos-1; // increment the 90 degree position of the horizontal motor - this will move the panel position Westward

 }

}

if(pos > 180) {pos = 180;} // reset the horizontal postion of the motor to 180 if it tries to move past this point

if(pos < 0) {pos = 0;} // reset the horizontal position of the motor to 0 if it tries to move past this point

myservo.write(pos); // write the starting position to the horizontal motor

delay(50);

}