int ledPin1 = 10;
int ledPin2 = 12;
int ledPin3 = 11;
int ledPin4 = 9;
int ledPin5 = 13;
void setup() {
pinMode(ledPin1, OUTPUT);
pinMode(ledPin2, OUTPUT);
pinMode(ledPin3, OUTPUT);
pinMode(ledPin4, OUTPUT);
pinMode(ledPin5, OUTPUT);
}

void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// The analog pin reads from 0 to 1023.
// This commands maps those numbers from 4 to 0
// So 0 becomes 4 and 1023 becomes 0
int mappedSensorValue = map( sensorValue, 0, 1023, 7, 0);
//Here we test the mappedsensorvalue. If it is greater then 1 we turn
// on the LED on Pin 2 and then see if it is greater then 2.

if (mappedSensorValue > 1 ) {
digitalWrite (ledPin5, HIGH);
if (mappedSensorValue > 2) {
digitalWrite (ledPin4, HIGH);
if (mappedSensorValue > 3) {
digitalWrite ( ledPin3, HIGH);
if (mappedSensorValue > 4) {
digitalWrite ( ledPin2, HIGH);
if (mappedSensorValue > 5) {
digitalWrite ( ledPin1, HIGH);
} else { //If it is not greater we start turning LEDs off.
digitalWrite ( ledPin1, LOW);
}
} else {
digitalWrite ( ledPin2, LOW);
}
} else {
digitalWrite ( ledPin3, LOW);
}

} else {
digitalWrite ( ledPin4, LOW);
}

} else {
digitalWrite ( ledPin5, LOW);
}
}