/*
Ahanix1989
Engages defrost and heated seat only when the car is started with remote start
*/

  int HornTriggered = 0;   // Has the horn been chirped?
  int BrakeTriggered = 0;  // Has the brakes been pressed?
  int MonitorCycle = 0;    // For the 'Watch for the horn' loop
  int DefrostCycle = 0;    // For the "Watch the brakes while defrosting' loop
  int HornReading = 0;     // Debug: The actual value detected on the horn circuit
  int BrakeReading = 0;    // Debug: The actual value detected on the brake circuit
  int MonitorComplete = 0; // Only allow the cycle to run once
  int brightness = 0;      // Fade LED
  int fadeAmount = 5;      // Fade LED Rate

void setup() {
  pinMode(9, OUTPUT);   // Heated Seats
  pinMode(10, OUTPUT);  // Defrost Relay
  pinMode(11, OUTPUT);  // Fading yellow LED ("Watching for Horn")
  pinMode(12, OUTPUT);  // Solid red LED ("Horn detected")
  digitalWrite(9, HIGH);  // No idea why these are reversed. Just rolling with it.
  digitalWrite(10, HIGH);
  digitalWrite(11, LOW);
  digitalWrite(12, LOW);
}

void loop() {

  Serial.begin(115200);
  if(MonitorComplete == 0){                // On boot, this is 0. After this first loop, it'll be 1.
    Serial.write("\nBeginning 10-second monitor for horn...");
    while(MonitorCycle < 1000){            // 1000 cycles x 10ms == 10 seconds
      if(digitalRead(8) == LOW){
        Serial.write("\n>> HORN: Low signal condition detected!");
        digitalWrite(12, HIGH);            // Red LED -- Horn Detected
        HornTriggered = 1;
      }
      MonitorCycle++;
      analogWrite(11, brightness);         // Fade the yellow LED
      brightness = brightness + fadeAmount;
      if(brightness == 0 || brightness == 255){
        fadeAmount = -fadeAmount;
      }
      delay(10);
    }
    Serial.write("\nMonitor Complete.");
  }
  if(MonitorComplete == 1){
    Serial.write("\nOn-boot monitor has already been completed.  Waiting 1 minute then resetting");
    delay(60000);
  }
  MonitorComplete = 1;   // Comment me out to loop constantly
  analogWrite(11, 0);    // Turn the LED off

  // Step 3: If the horn was triggered, activate the relays
  if(HornTriggered == 1){
    Serial.write("\nActivating Heated Seat relay in 5 seconds...");
    delay(5000);
    Serial.write("\n>>Seat relay ON");
    digitalWrite(9, LOW);
    delay(500);
    Serial.write("\n>>Seat relay OFF");
    digitalWrite(9, HIGH);
    Serial.write("\nActivating Defrost Relay in 2 seconds...");
    delay(2000);
    Serial.write("\n>>Defrost relay ON");
    digitalWrite(10, LOW);
    Serial.write("\n\nNow monitoring analog pin 5 for the next fifteen minutes");
    while(DefrostCycle < 12000){  // 12,000 cycles x 75ms == 900,000 == 15 minutes
      if(analogRead(A0) > 900){
        Serial.write("\n\n>> BRAKE: High signal condition detected!  |  Expected value < 900  |  Actual value: ");
        BrakeReading = analogRead(A5);
        Serial.println(BrakeReading);
        Serial.write("\n\n");
        digitalWrite(12, LOW); // The other LED...
        break;
      }
      delay(75);
      DefrostCycle++;
    }
    Serial.write(">>Defrost relay OFF");
    digitalWrite(10, HIGH);
    Serial.write("\n15-minute monitor complete.");

  }

 if(HornTriggered == 0){
   Serial.write("\n\nHorn signal never detected.\nAssuming normal key-in start was performed.");
 }

 Serial.write("\n\nResetting all the variables...");
 HornTriggered = 0;
 BrakeTriggered = 0;
 MonitorCycle = 0;
 DefrostCycle = 0;
 Serial.write("\n>>Resetting in 10 seconds...\n\n");
 delay(10000);
}