Single & multi sensor code I have been having problems trying to run multi sensor code for my project, this requires four KY-024 Linear magnetic Hall sensors as position sensors that trigger NC independent relays to make a circuit.
I can get the code to run on one independent circuit, one hall switch one relay with no problems.
But when I try the code for 4 hall sensors + relays I get no response from the circuit at this point I am at a loss where to go from here the code compiled with no problems.

int hallswitch = 1;
int val = 0;
int RELAY1 = 6;

void setup() {
  pinMode(hallswitch, INPUT);
  pinMode(RELAY1, OUTPUT);
}

void loop() {
  val = digitalRead(hallswitch);

  if (val == HIGH) {
    digitalWrite(RELAY1, HIGH);
  }
  else {
    digitalWrite(RELAY1, LOW);
  }
}


and

int hallswitch1 = 1;  //Pin for Hall switch
int hallswitch2 = 2;  //Pin for Hall switch
int hallswitch3 = 4;  //Pin for Hall switch
int hallswitch4 = 5;  //Pin for Hall switch

int val = 0;       //Integer for reading Hall statu

int RELAY1 = 6;    // The socket number on the Arduino that the relay1 will go to.
int RELAY2 = 7;    // The socket number on the Arduino that the relay1 will go to.
int RELAY3 = 8;    // The socket number on the Arduino that the relay1 will go to.
int RELAY4 = 9;    // The socket number on the Arduino that the relay1 will go to.

void setup()
{
  pinMode(hallswitch1, INPUT);
  pinMode (RELAY1, OUTPUT);

  pinMode(hallswitch2, INPUT);
  pinMode (RELAY2, OUTPUT);

  pinMode(hallswitch3, INPUT);
  pinMode (RELAY3, OUTPUT);

  pinMode(hallswitch4, INPUT);
  pinMode (RELAY4, OUTPUT);
}

void loop() {
  val = digitalRead(hallswitch1);               //Read Hall pin status
  val = digitalRead(hallswitch2);               //Read Hall pin status
  val = digitalRead(hallswitch3);               //Read Hall pin status
  val = digitalRead(hallswitch4);               //Read Hall pin status

  if (val == HIGH) {                        //If there is a magnet infront of Hall switch...
    digitalWrite(RELAY1, HIGH);             // Turn RELAY1 on:
    digitalWrite(RELAY2, HIGH);
    digitalWrite(RELAY3, HIGH);
    digitalWrite(RELAY4, HIGH);
  }
  else {
    digitalWrite(RELAY1, LOW);               // Turn RELAY1 off:
    digitalWrite(RELAY2, LOW);
    digitalWrite(RELAY3, LOW);
    digitalWrite(RELAY4, LOW);
  }
}
This is the quick and dirty way, I would suggest re writing it to use arrays rather then having to declare all these variables and copy paste pinMode, read,writes if statments a bunch of times.  

 int hallswitch1 = 1;  //Pin for Hall switch
 int hallswitch2 = 2;  //Pin for Hall switch
 int hallswitch3 = 4;  //Pin for Hall switch 
 int hallswitch4 = 5;  //Pin for Hall switch

 int val1 = 0;       //Integer for reading Hall statu  
 int val2 = 0; 
 int val3 = 0;
 int val4 = 0;

 int RELAY1 = 6;    // The socket number on the Arduino that the relay1 will go to.
 int RELAY2 = 7;    // The socket number on the Arduino that the relay1 will go to.
 int RELAY3 = 8;    // The socket number on the Arduino that the relay1 will go to.
 int RELAY4 = 9;    // The socket number on the Arduino that the relay1 will go to.

void setup()
{

  pinMode(hallswitch1, INPUT); 
  pinMode (RELAY1, OUTPUT);

  pinMode(hallswitch2, INPUT);
  pinMode (RELAY2, OUTPUT);

  pinMode(hallswitch3, INPUT);
  pinMode (RELAY3, OUTPUT);

  pinMode(hallswitch4, INPUT);
  pinMode (RELAY4, OUTPUT);  

}

void loop() {

  val1 = digitalRead(hallswitch1);               //Read Hall pin status
  val2 = digitalRead(hallswitch2);               //Read Hall pin status
  val3 = digitalRead(hallswitch3);               //Read Hall pin status
  val4 = digitalRead(hallswitch4);               //Read Hall pin status



  if (val1 == HIGH) {digitalWrite(RELAY1, HIGH);}
  else {digitalWrite(RELAY1, LOW);}

  if (val2 == HIGH) {digitalWrite(RELAY2, HIGH);}
  else {digitalWrite(RELAY2, LOW);}

  if (val3 == HIGH) {digitalWrite(RELAY3, HIGH);}
  else {digitalWrite(RELAY3, LOW);}

  if (val4 == HIGH) {digitalWrite(RELAY4, HIGH);}
  else {digitalWrite(RELAY4, LOW);}

}