GROUP 1

Hi! We are three students, Pablo Arbués, pilar martínez and Mario Concellón, from Cardenal Xavierre school and we're going to explain to you how we made a light seeker robot!!

First of all the list with the materials and tools we have used:

。Arduino nano
。A breadboard
。Male-male wires
。3 wheels
。Two DC motors
。Two 4.5v batteries
。L298n
。Screw divers
。Wires (solid core wires)
。platform made of plastic (where the robot is)

- SCHEME

-CODE.INO

int enA = 6;   
int in1 = 9;
int in2 = 8;


int enB = 5;

int in3 = 7;
int in4 = 10;

velocities of the wheels

const int Fast = 225;           DC motors going fast
const int Slow =0;              DC motors going slow. 


const int RightLightSensor = 0; declare the analog pins for the photoresistors

const int LeftLightSensor = 2;  declare the analog pins for the photoresistors

int SensorLeft;         intensity light (left)
int SensorRight;        intensity light (right)
int SensorDifference;   diference of light intensity between left and right (absolute value)
int SensorThresh = 80;  sensitivity to light intensity                

void setup() {
                
       pinMode(enA, OUTPUT);
                pinMode(enB, OUTPUT);
                pinMode(in1, OUTPUT);
                pinMode(in2, OUTPUT);
                pinMode(in3, OUTPUT);
                pinMode(in4, OUTPUT);
                pinMode(LeftLightSensor, INPUT);
                pinMode(RightLightSensor, INPUT);
                //Serial.begin(9600);
                
              }

void loop(){

       

       SensorLeft =analogRead(LeftLightSensor);         "reading the ldr"
       delay(3);
       SensorRight =analogRead(RightLightSensor);
       delay(3);
       SensorDifference = abs(SensorLeft - SensorRight);
       if (SensorLeft > SensorRight && SensorDifference > SensorThresh) {   //turn right
                 turncarright();
                 
       }
       if (SensorLeft < SensorRight && SensorDifference > SensorThresh) {   //turn left
                 turncarleft();
                 
       }

                                                                   
       if (SensorDifference < SensorThresh+1){ //forward 
                 carforward();
                     
       }
 
        

         }
         

void turncarleft(){
                                      "moving the car left"
       Serial.print("turncarleft");
       Serial.print("\n");*/
       digitalWrite(in1, HIGH);        left DC MOTOR  ahead
       digitalWrite(in2, LOW);  
       ditaiglWrite(in3, HIGH);        right DC MOTOR ahead

       digitalWrite(in4, LOW);
       analogWrite(enA, 0);            left DC MOTOR slow
       analogWrite(enB, Fast);         right DC MOTOR Fast
       delay(300);
     
      
       
                  }
                  
void turncarright(){
                                      "moving the car right"

       Serial.print("turncarright");
       Serial.print("\n");*/
       digitalWrite(in1, HIGH);        left DC MOTOR ahead
       digitalWrite(in2, LOW);  
       digitalWrite(in3, HIGH);        right DC MOTOR ahead
       digitalWrite(in4, LOW);
       analogWrite(enA, Fast);         left DC MOTOR slow
       analogWrite(enB, 0);            right DC MOTOR fast
       delay(300);

       
       
        
                   }
                   
void carforward(){
                                       "moving the car forward"

       Serial.print("carforward");
       Serial.print("\n");*/
       digitalWrite(in1, HIGH);         left DC MOTOR ahead
       digitalWrite(in2, LOW);  
       digitalWrite(in3, HIGH);         right DC MOTOR ahead
       digitalWrite(in4, LOW);
       analogWrite(enA, Fast);          left DC MOTOR slow
       analogWrite(enB, Fast);          right DC MOTOR slow
       delay(300);
       
                    }

void stopthecar(){ 
  
       Serial.print("stopthecar");
       Serial.print("\n");
       digitalWrite(in1, LOW);
       digitalWrite(in2, LOW);  
       digitalWrite(in3, LOW);
       digitalWrite(in4, LOW);

       delay(1);
                    }  

These are some pictures we took during the project:                                                                

These are photos of the final result:

         These are some of the pictures we also took while making the project.

Links to similar projects:   https://galideas.wordpress.com>sitio>upload

Comments and youtubr link of our project:

Our video shows that our robot has got a problem, which is that it starts to spin, instead of following the light in a straight way. This is doue to the fact that one of our motors broke while working on it, so we had to find another one, which resulted to be a little bit different than the original one, having less power, so it r9tates slower.

We have worked a lot, a lot, but we still have something to check and learn!! This has been a great project and we would like to do more and to investigate more about arduino!!

https://youtu.be/x7VTCNLOWfQ

(That is the youtube link to the video)