#define POT A0 
#define LED1 7 
#define LED2 8
#define LED3 9 
void setup() {
  pinMode(POT, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int value=analogRead(POT);
Serial.println(value);
int a=map(value,0,1023,0,255);
Serial.println(a);
if(a<=100)
{
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, LOW);
  digitalWrite(LED3, LOW);
}
else if(a>=100&&a<=200)
{
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH); 
  digitalWrite(LED3, LOW);
}
else
{
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED3, HIGH);
}
}