const int Injector_One_Sensor = 0;                  //Set sensor for injector one LED as DI on pin #0
const int Injector_Two_Sensor = 1;                  //Set sensor for injector two LED as DI on pin #1
const int Injector_Three_Sensor = 2;                //Set sensor for injector three LED as DI on pin #2
const int Injector_Four_Sensor = 3;                 //Set sensor for injector four LED as DI on pin #3
const int Ignition_Coil_One_Sensor = 4;             //Set sensor for ignition coil one LED as DI on pin #4
const int Ignition_Coil_Two_Sensor = 5;             //Set sensor for ignition coil two LED as DI on pin #5
const int Ignition_Coil_Three_Sensor = 6;           //Set sensor for ignition coil three LED as DI on pin #6
const int Ignition_Coil_Four_Sensor = 7;            //Set sensor for ignition coil four LED as DI on pin #7
const int Injector_One_Solenoid = 8;                //Set injector solenoid one LED as DO on pin #8
const int Injector_Two_Solenoid = 9;                //Set injector solenoid two LED as DO on pin #9
const int Injector_Three_Solenoid = 10;             //Set injector solenoid three LED as DO on pin #10
const int Injector_Four_Solenoid = 11;              //Set injector solenoid four LED as DO on pin #11
const int Ignition_Coil_One = 12;                   //Set ignition coil one LED as DO on pin #12
const int Ignition_Coil_Two = 13;                   //Set ignition coil two LED as DO on pin #13
const int Ignition_Coil_Three = 14;                 //Set ignition coil three LED as DO on pin #14
const int Ignition_Coil_Four = 15;                  //Set ignition coil four LED as DO on pin #15
int Injector_One_Sensor_State;                      //Create an integer variable for logical state checking                  
int Injector_Two_Sensor_State;                      //Create an integer variable for logical state checking 
int Injector_Three_Sensor_State;                    //Create an integer variable for logical state checking 
int Injector_Four_Sensor_State;                     //Create an integer variable for logical state checking 
int Ignition_Coil_One_Sensor_State;                 //Create an integer variable for logical state checking 
int Ignition_Coil_Two_Sensor_State;                 //Create an integer variable for logical state checking 
int Ignition_Coil_Three_Sensor_State;               //Create an integer variable for logical state checking 
int Ignition_Coil_Four_Sensor_State;                //Create an integer variable for logical state checking 



void setup() {
  pinMode(Injector_One_Sensor, INPUT);              //Assign injector one sensor as an input                     
  pinMode(Injector_Two_Sensor, INPUT);              //Assign injector two sensor as an input 
  pinMode(Injector_Three_Sensor, INPUT);            //Assign injector three sensor as an input 
  pinMode(Injector_Four_Sensor, INPUT);             //Assign injector four sensor as an input 
  pinMode(Ignition_Coil_One_Sensor, INPUT);         //Assign ignition coil one sensor as an input
  pinMode(Ignition_Coil_Two_Sensor, INPUT);         //Assign ignition coil two sensor as an input
  pinMode(Ignition_Coil_Three_Sensor, INPUT);       //Assign ignition coil three sensor as an input
  pinMode(Ignition_Coil_Four_Sensor, INPUT);        //Assign ignition coil four sensor as an input
  pinMode(Injector_One_Solenoid, OUTPUT);           //Assign injector one solenoid as an output
  pinMode(Injector_Two_Solenoid, OUTPUT);           //Assign injector two solenoid as an output
  pinMode(Injector_Three_Solenoid, OUTPUT);         //Assign injector three solenoid as an output
  pinMode(Injector_Four_Solenoid, OUTPUT);          //Assign injector four solenoid as an output
  pinMode(Ignition_Coil_One, OUTPUT);               //Assign ignition coil one as an output
  pinMode(Ignition_Coil_Two, OUTPUT);               //Assign ignition coil two as an output
  pinMode(Ignition_Coil_Three, OUTPUT);             //Assign ignition coil three as an output
  pinMode(Ignition_Coil_Four, OUTPUT);              //Assign ignition coil four as an output
  
  }

void loop() {
  Injector_One_Sensor_State = digitalRead(Injector_One_Sensor);                   //check the logical state of injector one sensor (either HIGH or LOW)
  if (Injector_One_Sensor_State == LOW) {                                         //conditional statement for IF injector one sensor is logical LOW
    digitalWrite(Injector_One_Solenoid, HIGH);                                    //Turn ON injector one solenoid LED (white)
  }
  else {                                                                          //opposite conditional statement for IF injector one sensor is NOT logical HIGH
    digitalWrite(Injector_One_Solenoid, LOW);                                     //Turn OFF injector one solenoid LED (white)
  }
  Injector_Two_Sensor_State = digitalRead(Injector_Two_Sensor);                   //check the logical state of injector two sensor (either HIGH or LOW)
  if (Injector_Two_Sensor_State == LOW) {                                         //conditional statement for IF injector two sensor is logical LOW
    digitalWrite(Injector_Two_Solenoid, HIGH);                                    //Turn ON injector two solenoid LED (white)
  }
  else {                                                                          //opposite conditional statement for IF injector two sensor is NOT logical HIGH
    digitalWrite(Injector_Two_Solenoid, LOW);                                     //Turn OFF injector two solenoid LED (white)
  }
  Injector_Three_Sensor_State = digitalRead(Injector_Three_Sensor);               //check the logical state of injector three sensor (either HIGH or LOW) 
  if (Injector_Three_Sensor_State == LOW) {                                       //conditional statement for IF injector three sensor is logical LOW
    digitalWrite(Injector_Three_Solenoid, HIGH);                                  //Turn ON injector three solenoid LED (white)
  }
  else {                                                                          //opposite conditional statement for IF injector three sensor is NOT logical HIGH
    digitalWrite(Injector_Three_Solenoid, LOW);                                   //Turn OFF injector three solenoid LED (white)
  }
  Injector_Four_Sensor_State = digitalRead(Injector_Four_Sensor);                 //check the logical state of injector four sensor (either HIGH or LOW) 
  if (Injector_Four_Sensor_State == LOW) {                                        //conditional statement for IF injector four sensor is logical LOW
    digitalWrite(Injector_Four_Solenoid, HIGH);                                   //Turn ON injector four solenoid LED (white)
  }
  else {                                                                          //opposite conditional statement for IF injector four sensor is NOT logical HIGH
    digitalWrite(Injector_Four_Solenoid, LOW);                                    //Turn OFF injector four solenoid LED (white)
  }
  Ignition_Coil_One_Sensor_State = digitalRead(Ignition_Coil_One_Sensor);         //check the logical state of ignition one sensor (either HIHG or LOW)
  if (Ignition_Coil_One_Sensor_State == LOW) {                                    //conditional statement for IF ignition one sensor is logical LOW
    digitalWrite(Ignition_Coil_One, HIGH);                                        //Turn ON ingnition one solenoid LED (red)
  }
  else {                                                                          //opposite conditional statement for IF ignition one sensor is NOT logical HIGH
    digitalWrite(Ignition_Coil_One, LOW);                                         //Turn OFF ingnition one solenoid LED (red)
  }
  Ignition_Coil_Two_Sensor_State = digitalRead(Ignition_Coil_Two_Sensor);         //check the logical state of ignition two sensor (either HIHG or LOW)
  if (Ignition_Coil_Two_Sensor_State == LOW) {                                    //conditional statement for IF ignition two sensor is logical LOW
    digitalWrite(Ignition_Coil_Two, HIGH);                                        //Turn ON ingnition two solenoid LED (red)
  }   
  else {                                                                          //opposite conditional statement for IF ignition two sensor is NOT logical HIGH
    digitalWrite(Ignition_Coil_Two, LOW);                                         //Turn OFF ingnition two solenoid LED (red)
  }
  Ignition_Coil_Three_Sensor_State = digitalRead(Ignition_Coil_Three_Sensor);     //check the logical state of ignition three sensor (either HIHG or LOW)
  if (Ignition_Coil_Three_Sensor_State == LOW) {                                  //conditional statement for IF ignition three sensor is logical LOW
    digitalWrite(Ignition_Coil_Three, HIGH);                                      //Turn ON ingnition three solenoid LED (red)
  }
  else {                                                                          //opposite conditional statement for IF ignition three sensor is NOT logical HIGH
    digitalWrite(Ignition_Coil_Three, LOW);                                       //Turn OFF ingnition three solenoid LED (red)
  }
  Ignition_Coil_Four_Sensor_State = digitalRead(Ignition_Coil_Four_Sensor);       //check the logical state of ignition four sensor (either HIHG or LOW)
  if (Ignition_Coil_Four_Sensor_State == LOW) {                                   //conditional statement for IF ignition four sensor is logical LOW
    digitalWrite(Ignition_Coil_Four, HIGH);                                       //Turn ON ingnition four solenoid LED (red)
  }
  else {                                                                          //opposite conditional statement for IF ignition four sensor is NOT logical HIGH
    digitalWrite(Ignition_Coil_Four, LOW);                                        //Turn OFF ingnition four solenoid LED (red)
  }
}