#define relay1  21
#define relay2  19
#define relay3  18
#define pot1    33
#define pot2    34
#define pot3    35

void setup() 
{ Serial.begin(9600);
  pinMode(relay1,OUTPUT);
  pinMode(relay2,OUTPUT);
  pinMode(relay3,OUTPUT);
}

int an1,an2,an3;

void loop() 
{ digitalWrite(relay1,HIGH);
  digitalWrite(relay3,LOW);
  an1 = analogRead(pot1);
  Serial.print(an1);
  Serial.println("  ");
  delay(50);

  // digitalWrite(relay1,LOW);
  // digitalWrite(relay2,HIGH);
  // an2 = analogRead(pot2);
  // Serial.print(an2);
  // Serial.print("  ");
  // delay(500);

  // digitalWrite(relay2,LOW);
  // digitalWrite(relay3,HIGH);
  // an3 = analogRead(pot3);
  // Serial.print(an3);
  // Serial.println("  ");
  // delay(500);
}
NOCOMNCVCCGNDINLED1PWRRelay Module
NOCOMNCVCCGNDINLED1PWRRelay Module
NOCOMNCVCCGNDINLED1PWRRelay Module