//3p pulse trigger
//march 08   Ver.6

int low_p = 6;       // Low Pressure Solenoid  RY-1
int high_p = 7;       // High Pressure Solenoid  RY-2
int exhaust = 8;  // Exhaust solenoid  RY-3
int count = 9;    //  Contact Closure for counter  RY-4
int fire = 2;     // High Pulse from PS control box, BOB ReCharge
int wd = 12;      // LOW Pulse to 555 WDT


void setup() {
  pinMode(low_p, OUTPUT);
  pinMode(high_p, OUTPUT);
  pinMode(count, OUTPUT);
  pinMode (wd, INPUT);
 

  pinMode(fire, INPUT);

  //Power ON RESET
  digitalWrite(low_p, LOW);      // Turn Off LP air, close solenoid #1
  digitalWrite(high_p, LOW);     // Turn OFF HP Air , close relay #2,
  digitalWrite (high_p, LOW);    // Close Exhaust Port, Solenoid #3

  Serial.begin(9600);

}

void loop() {

  // WatchDog
   pinMode (wd, OUTPUT);
  digitalWrite(wd, LOW);
  delay (50);                            // Feed WD for 50 ms
   pinMode (wd, INPUT);

  // Counter
  digitalWrite(count, HIGH);             // close relay #4 counter
  delay (100);                           // wait 100ms
  digitalWrite(count, LOW);              // open relay #4


  // PURGE
  digitalWrite(exhaust, HIGH);              // Open Exhaust Port solenoid #3
  Serial.println("Exhaust Solenoid OPEN");     // prints a label
  digitalWrite(high_p, HIGH);               // Open High Pressure Solenoid #2
  Serial.println("HP AIR ON     PURGE");       // prints a label

  delay(1000);  // wait one second

  digitalWrite(high_p, LOW);                // Close HP solenoid, solenoid #2
  Serial.println("High Pressure Solenoid CLOSED");     // prints a label
  digitalWrite(exhaust, LOW);                // Close Exhaust solenoid #3
  Serial.println("Exhaust Solenoid Closed     Purge Finished");        // prints a label

  // LOW Pressure ON
  digitalWrite(low_p, HIGH);      // Pressureize switch, Open solenoid #1
  Serial.println("Low Pressure Air ON");     // prints a label

  delay(500);

  digitalWrite(low_p, LOW);      // Turn Off Low Pressure Air, Close solenoid #1
  Serial.println("Low Pressure Air OFF      Waiting For FIRE CMD");     // prints a label

  // FIRE
  while  (digitalRead (fire) == HIGH); {         // if fire CMD is HIGH, wait. if low continue
    Serial.println("FIRE Command Received");       // prints a label
  }

  delay(1000);
}