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By clarkesclass
#199105
Hi,
We're trying to program a robot to follow a black line. Insteed of learning the code our teacher told use to copy and paste the code , so we dont learn anything.
This is what we have come up with so far. If anyone has any ideas let us know.
/*


*/
const int AO1 = 13; //control pin 1 on the motor driver for the right motor
const int AO2 = 12; //control pin 2 on the motor driver for the right motor
const int PWMA = 11;
const int PWMB = 10; //speed control pin on the motor driver for the left motor
const int BO2 = 9; //control pin 2 on the motor driver for the left motor
const int BO1 = 8; //control pin 1 on the motor driver for the left motor

int sensorPin = A0; // select the input pin for ldr
int sensorPin2 = A1;
int sensorValue = 0; // variable to store the value coming from the sensor
int sensorValue2 = 0;


void setup() {
pinMode(2, OUTPUT); //pin connected to the relay
pinMode(AO1, OUTPUT);
pinMode(AO2, OUTPUT);
pinMode(PWMA, OUTPUT);

pinMode(BO1, OUTPUT);
pinMode(BO2, OUTPUT);
pinMode(PWMB, OUTPUT);

Serial.begin(9600); //sets serial port for communication
}

void loop() {
// read the value from the sensor:
sensorValue = analogRead(sensorPin);
Serial.println(sensorValue);
sensorValue = analogRead(sensorPin2);
Serial.println(sensorValue2);

if(sensorValue < 100) //setting a threshold value
{
digitalWrite(AO1,HIGH); //turn relay ON
digitalWrite(AO2,HIGH);
}

else //turn relay OFF
{
digitalWrite(AO1,LOW);
digitalWrite(AO2,LOW);
}
if(sensorValue2 < 100) //setting a threshold value
{
digitalWrite(BO1,HIGH); //turn relay ON
digitalWrite(BO2,HIGH);
}

else //turn relay OFF
{
digitalWrite(BO1,LOW);
digitalWrite(BO2,LOW);
}
}
The idea is to have the photoresistors sense the black and turn on the motors
User avatar
By DanV
#199109
Please enlighten us as to what it doesn't do correctly!
So, did you learn to program and dream that code up yourselves (you say that's what you've come up with so far).

You should check this section of code:
Code: Select all
 sensorValue = analogRead(sensorPin); 
 Serial.println(sensorValue);
 sensorValue = analogRead(sensorPin2); 
 Serial.println(sensorValue2);
Clearly, the second sensor reading should be assigned to sensorValue2 (emphasis on "2").
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