const int sensorPin1 = A0;
const int sensorPin2 = A1;
const int sensorPin3 = A2;
const int ledPin1 = 11; //changed
const int ledPin2 = 2;
const int ledPin3 = 3;
const int ledPinMain = 4;
int sensorValue = 0; // the sensor value
int sensorMin = 1023; // minimum sensor value //what does it mean 1023?
int sensorMax = 0;
is it right so far? 