#define lefEngine 4
#define rightEngine 5

unsigned int sensor;

void setup()
{
Serial.begin(9600);
pinMode(leftEngine, OUTPUT);
pinMode(rightEngine, OUTPUT);
}

void loop()
{
senzor = analogRead (A0);
Serial.print ("Sensor = ");
Serial.println (sensor);
}


if (senzor>400)
{
digitalWrite(leftEngine,HIGH);
digitalWrite(rightEngine,LOW);
}