Motors and Line Follower Sensors

Using Arduino Programming Questions
1

I am trying to make a robot follower of line with 3 sensors, But I am having difficulty in programming, Hereunder the programming

//Standard PWM DC control
int E1 = 5; //M1 Speed Control
int E2 = 6; //M2 Speed Control
int M1 = 4; //M1 Direction Control
int M2 = 7; //M1 Direction Control

//Sensores
int sensorCantoDir = A1;
int sensorMeio = A3;
int sensorCantoEsq = A4;

int ValorCorte = 75;

int ValorLinhaM,ValorLinhaD,ValorLinhaE = 0;

void setup(void){
int i;
for(i=4;i<=7;i++)
pinMode(i, OUTPUT);
Serial.begin(9600);
}

void loop(){

valorLinhaM = analogRead(sensorMeio);
valorCantoD = analogRead(sensorCantoDir);
valorCantoE = analogRead(sensorCantoEsq);

if(valorSensorM > ValorCorte){
digitalWrite(M1, LOW); //rotacao no sentido horario do canal 1
digitalWrite(M2, LOW); //rotacao no sentido horario do canal 2
analogWrite(E1, 100); //informa a velocidade do canal 1 - 0 É A VELOCIDADE MINIMA
analogWrite(E2, 100); //informa a velocidade do canal 2 - 255 É A VELOCIDADE MÁXIMA
}

delay(1000); //espera 1 segundo

analogWrite(E1, 0);
analogWrite(E2, 0);

delay(1000);

if(valorSensorD > ValorCorte){
digitalWrite(M1, LOW); //rotacao no sentido horario do canal 1
digitalWrite(M2, HIGH); //rotacao no sentido horario do canal 2
analogWrite(E1, 255);
analogWrite(E2, 255);
}

delay(500); //espera 0.5 segundo

analogWrite(E1, 0);
analogWrite(E2, 0);

delay(1000);

if(valorSensorE > ValorCorte){
digitalWrite(M1, HIGH); //rotacao no sentido horario do canal 1
digitalWrite(M2, LOW); //rotacao no sentido horario do canal 2
analogWrite(E1, 255);
analogWrite(E2, 255);

delay(500); //espera 1 segundo

analogWrite(E1, 0);
analogWrite(E2, 0);

delay(1000);

2

What does the program do ?
What should it do ?

I note that valorSensorE (and other variables) are not declared in the code you posted, but the program as posted is not complete.

Please read this before posting a programming question and follow the advice regarding posting code.

3

The program is clearly incomplete.

Please remember to use code tags when posting code.

4

Your working program to follow a line will have NO delay() statements.

You do NOT drive both wheels at the same speed to follow a line. The difference between the left wheel speed and the right wheel speed will depend on how far the line is from the center sensor.