Line Following Robot Help ..

Using Arduino Programming Questions
1

int motor_left = 22;
int motor_right = 24;
int sensor_left = 26;
int sensor1 = 28;
int sensor2 = 30;
int sensor_right = 32;
void setup ()
{
pinMode(motor_left, OUTPUT);
pinMode(motor_right, OUTPUT);
pinMode(sensor_left, INPUT);
pinMode(sensor1, INPUT);
pinMode(sensor2, INPUT);
pinMode(sensor_right, INPUT);
}
void loop()
{
if (sensor_left == LOW && sensor1 == HIGH && sensor2 == HIGH && sensor_right == LOW)
{
digitalWrite(motor_left, HIGH);
digitalWrite(motor_right, HIGH);
}
if (sensor_left == LOW && sensor1 == LOW && sensor2 == HIGH && sensor_right == HIGH
{
digitalWrite(motor_left, HIGH);
digitalWrite(motor_right, LOW);
}
{
if (sensor_left == HIGH && sensor1 == HIGH && sensor2 == LOW && sensor_right == LOW)
{
digitalWrite(motor_left, LOW);
digitalWrite(motor_right, HIGH);
}

There are some error ..
Plz Remove these error

2

As I'm having to guess at what the errors might be, I'd say you have a ) missing at the end of the second if statement. You also have an extra { and a missing }.

3

after copying your code and clicking verify I was informed of the following errors:

a missing ), an extra {, and a missing }

After correcting the errors found by clicking verify, the code compiled, however as I don't have a circuit diagram, etc for your robot, I do not know if this will do as you are expecting.

for example what happens if all the senors are low or high?

4

Missing code tags too.
Those constants could do to be const, also.

5

Apart from the syntax errors, you also are not reading the digital sensor pins.
The "if" statements aren't going to do anything useful - e.g. this snippet:

if (sensor_left == LOW

compares 26 (the value of sensor_left) with LOW and it will always fail.

I assume that what you mean is:

if (digitalRead(sensor_left) == LOW

Fix up this and the other sensor readings and things might start working better.

Pete