Using Sensors with Arduino

1int sensor1Value = 0;
2void setup()
3{
4  // declare the ledPins  as an OUTPUT:
5  pinMode(13, OUTPUT);
6  
7}
8
9void loop() {
10  //  read the value from the sensor:
11  sensor1Value = analogRead(A0);
12{
13  if(sensor1Value  <200)     // check the value of sensor 
14 {                          //if the  value is less than 200 then turn the leds on
15 digitalWrite(13, HIGH);
16  delay(500);
17  }
18 else                      // if the value is greater than or equal to 200  then turn leds off
19 {
20  digitalWrite(13, LOW);
21  delay(500);
22}
23}
24