Temperature Sensor + Potentiometer

const int POT = 0;
double val = 0;
double voltage = 0;
float temp = 0;
int red = 7;
int green = 6;
int blue = 5;
void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
 val = analogRead(A0);
 voltage = (val)*5;
 temp = (voltage-500)/10;
 Serial.println(val);
 delay(500);

 if (val<140){
  digitalWrite(blue, HIGH);
 
 }
 else if (140<=val<= 150){
 
  digitalWrite(green, HIGH);
 
 }
  if (150 < val){
  digitalWrite(red, HIGH);

 }
}

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