#define TRIGGER_PIN  4 // Establish digital pin connection to the trigger pin of the ultrasonic sensor
#define ECHO_PIN     5 // Establish digital pin connection to the echo pin of the ultrasonic sensor
// Establish pin connection for flame sensor
const int flamePin = 6; //  Flame sensor pin connected to pin 6 of the board

// Establish pin connection for the temperature sensor
const int tempPin = A0; // Temperature sensor pin will be connected to analog pin A0

void setup() {
  Serial.begin(9600); // Initialize serial communication
  pinMode(TRIGGER_PIN, OUTPUT); // Set trigger pin as output
  pinMode(ECHO_PIN, INPUT); // Set echo pin as input

  // Set the flame sensor pin as an input
  pinMode(flamePin, INPUT);

}

void loop() {
 // Trigger a pulse to start the ultrasonic measurement
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);
  
  // Measure the duration of the echo pulse
  long duration = pulseIn(ECHO_PIN, HIGH);
  
  // Calculate distance in centimeters
  float distance_cm = duration * 0.034 / 2;
  
  // Check if distance is within a certain range to determine bin level; Bin is full is level is higher than 5 inch to lid
  if (distance_cm < 12.7) {
    Serial.println("Bin full!");
  } else {
    Serial.println("Bin Ok");
  }
  // Check status of flame sensor
  int flameState = digitalRead(flamePin);
  // Check if flame is detected
  if (flameState == HIGH) {
    Serial.println("Flame detected!");
  } else {
    Serial.println("No flame detected.");
  }
  // Read the analog value from the temperature sensor
  int sensorValue = analogRead(tempPin);
  // Convert the analog value to temperature in Celsius
  float temperatureC = (sensorValue * 5.0 / 1024.0) * 100.0;
  // Check if temperature is higher than 200degrees celcius (for PoC purposes only)
  if (temperatureC >200 ) {
  // Print the temperature to the serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperatureC);
  Serial.println(" High and abnormal");
  } else {
    Serial.print("Temperature: ");
  Serial.print(temperatureC);
  Serial.println(" Normal");
  }

}