const int trigPin = 5; // Pin number for the trigger pin of the ultrasound sensor
const int echoPin = 18; // Pin number for the echo pin of the ultrasound sensor

#define SOUND_SPEED 0.0343 // Speed of sound in cm/µs

long duration; // Variable to store the duration of the sound wave travel
float distanceCm; // Variable to store the calculated distance in centimeters

const int numMeasurements = 600; // Number of measurements to store (10 minutes with measurements every second)
float measurements[numMeasurements]; // Array to store the measurements
int currentMeasurement = 0; // Index of the current measurement
int totalMeasurements = 0; // Total number of measurements taken

unsigned long previousTime = 0; // Variable to store the previous time for summary update
unsigned long summaryInterval = 10000; // Interval for summary update in milliseconds (10 seconds)

float overallAverage = 0; // Variable to store the overall average distance
float highestValue = 0; // Variable to store the highest measured distance
float lowestValue = 0; // Variable to store the lowest measured distance
float sum = 0; // Variable to store the sum of measurements

void setup() {
  Serial.begin(115200); // Initialize serial communication with a baud rate of 115200
  pinMode(trigPin, OUTPUT); // Set the trigger pin as an output
  pinMode(echoPin, INPUT); // Set the echo pin as an input
  Serial.println("Starting Program"); // Print a message to indicate the program has started
}

void loop() {
  Serial.println(distanceCm); // Print the current distance in centimeters
  delay(1000); // Delay for 1 second

  if (Serial.available() > 0) { // Check if there is any input from the serial monitor
    char input = Serial.read(); // Read the input character
    if (input == 's') { // If the input is 's'
      printSummary(); // Call the function to print the summary
    }
  }

  unsigned long currentTime = millis(); // Get the current time in milliseconds
  if (currentTime - previousTime >= summaryInterval) { // If the time since the last summary update is greater than or equal to the summary interval
    updateSummary(); // Call the function to update the summary
    previousTime = currentTime; // Update the previous time
  }

  digitalWrite(trigPin, LOW); // Set the trigger pin to low
  delayMicroseconds(2); // Delay for 2 microseconds

  digitalWrite(trigPin, HIGH); // Set the trigger pin to high
  delayMicroseconds(10); // Delay for 10 microseconds
  digitalWrite(trigPin, LOW); // Set the trigger pin to low

  duration = pulseIn(echoPin, HIGH); // Measure the duration of the echo pulse

  distanceCm = duration * SOUND_SPEED / 2; // Calculate the distance in centimeters based on the duration

  measurements[currentMeasurement] = distanceCm; // Store the current measurement in the measurements array

  currentMeasurement = (currentMeasurement + 1) % numMeasurements; // Update the current measurement index (wrap around to the beginning if it reaches the end)
  totalMeasurements = min(totalMeasurements + 1, numMeasurements); // Update the total measurements count, but ensure it doesn't exceed the maximum number of measurements

  delay(100); // Delay for 100 milliseconds
}

void printSummary() {
  highestValue = measurements[0]; // Initialize the highest value with the first measurement
  lowestValue = measurements[0]; // Initialize the lowest value with the first measurement
  sum = 0; // Reset the sum before calculating

  for (int i = 0; i < totalMeasurements; i++) { // Loop through the stored measurements
    sum += measurements[i]; // Add the current measurement to the sum

    if (measurements[i] > highestValue) { // If the current measurement is higher than the highest value
      highestValue = measurements[i]; // Update the highest value
    }

    if (measurements[i] < lowestValue) { // If the current measurement is lower than the lowest value
      lowestValue = measurements[i]; // Update the lowest value
    }

    if ((i + 1) % 10 == 0) { // If 10 measurements have been processed
      float average = sum / 10; // Calculate the average of the 10 measurements
      Serial.print("Average after ");
      Serial.print(i + 1);
      Serial.print(" seconds: ");
      Serial.println(average); // Print the average
      sum = 0; // Reset the sum for the next set of measurements
    }
  }

  printOverallAverage(); // Call the function to print the overall average
  Serial.print("Highest Value: ");
  Serial.println(highestValue); // Print the highest value
  Serial.print("Lowest Value: ");
  Serial.println(lowestValue); // Print the lowest value
}

void updateSummary() {
  highestValue = measurements[0]; // Initialize the highest value with the first measurement
  lowestValue = measurements[0]; // Initialize the lowest value with the first measurement
  sum = 0; // Reset the sum before calculating

  for (int i = 0; i < totalMeasurements; i++) { // Loop through the stored measurements
    sum += measurements[i]; // Add the current measurement to the sum

    if (measurements[i] > highestValue) { // If the current measurement is higher than the highest value
      highestValue = measurements[i]; // Update the highest value
    }

    if (measurements[i] < lowestValue) { // If the current measurement is lower than the lowest value
      lowestValue = measurements[i]; // Update the lowest value
    }
  }

  overallAverage = sum / totalMeasurements; // Calculate the overall average by dividing the sum by the total number of measurements
}

void printOverallAverage() {
  float totalSum = 0;
  for (int i = 0; i < totalMeasurements; i++) { // Loop through the stored measurements
    totalSum += measurements[i]; // Add the current measurement to the total sum
  }
  overallAverage = totalSum / totalMeasurements; // Calculate the overall average by dividing the total sum by the total number of measurements
  Serial.print("Overall Average: ");
  Serial.println(overallAverage); // Print the overall average
}