Control your light with Arduino

1//Declaration of the sensor and led
2const int sensorPin = A0;
3const  int ledPin = 3;
4const int potentiometerPin = A1;
5//Declaration variables
6float  potentiometerVal;
7float sensorVal;//sensor
8float light = 0;//brightness led
9float  mapping;//mapping of led
10
11void setup(){
12  // open a serial connection to  display values
13  Serial.begin(9600);
14  //set up the Pin of the Led
15  pinMode(ledPin,OUTPUT);
16}
17
18void  loop(){
19  sensorVal = analogRead(sensorPin);
20  potentiometerVal = analogRead(potentiometerPin);
21  
22  //Reverse mapping of the light to the brightness
23  potentiometerVal =  map(potentiometerVal, 0, 1023, 0, 255);
24  sensorVal = map(sensorVal,0,1023, 255,  0);
25  mapping = potentiometerVal;
26  light = map (sensorVal, 0, 255, sensorVal  - potentiometerVal , 255);
27  
28  if (light <= 0)
29    light=0;
30    
31  Serial.print("Brightness: ");
32  Serial.println(sensorVal);
33  Serial.print("Mapping:  ");
34  Serial.println(potentiometerVal);
35  analogWrite(ledPin,light);
36  Serial.print("Light: ");
37  Serial.println(light);
38  delay(15);
39}