4X Relay Tester

/********************************************
 *                                          *
 *           Relay Board Test Jig           *
 *           by Learnelectronics            *
 * https://www.youtube.com/learnelectronics *
 *                                          *
 ********************************************/


void setup() {                                      // Setup Loop - Runs once, set's the parameters of the Arduino
 pinMode(A0,INPUT);                                 // set the analog 0 pin as input o control delay
 pinMode(7,OUTPUT);                                 // set digital pins 7-4 as outputs
 pinMode(6,OUTPUT);
 pinMode(5,OUTPUT);
 pinMode(4,OUTPUT);
 digitalWrite(7,HIGH);                              // set digital pins 7-4 OUTPUT ON (HIGH)
 digitalWrite(6,HIGH);                              // relay works off of low signal
 digitalWrite(5,HIGH);                              // so a HIGH pin is an idle pin in this case
 digitalWrite(4,HIGH);


}

void loop() {                                       //Main Loop - runs over and over

  int potraw = (analogRead(A0));                    //get reading from the potentiomter on A0
  int waitfor = map(potraw, 0, 1024, 1, 254);       //Take the raw value 0-1024 and convert it into
                                                    //a 0-254 value the Arduino can use

  digitalWrite(7,LOW);                              //relay on
  delay(waitfor);                                   //stay on for time determined by var waitfor
  digitalWrite(7,HIGH);                             //relay off

  digitalWrite(6,LOW);
  delay(waitfor);
  digitalWrite(6,HIGH);

  digitalWrite(5,LOW);
  delay(waitfor);
  digitalWrite(5,HIGH);

  digitalWrite(4,LOW);
  delay(waitfor);
  digitalWrite(4,HIGH);

}