const int potPin = A4; 
const int relayPin = 2; 

void setup() {
 pinMode(potPin, INPUT);
pinMode(relayPin, OUTPUT);
Serial.begin(9600); 
}

void loop() {
        
int potValue = analogRead(potPin);
            
int relayValue = map(potValue, 0, 1023, 0, 255);
                
if (relayValue > 128) {
digitalWrite(relayPin, HIGH);
                       
digitalWrite(relayPin, LOW);
Serial.println(relayValue);
delay(100); 
}


}