const int trigPin = 5;
const int echoPin = 18;

//define sound speed in cm/uS
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

unsigned long startTime; //start time
unsigned long lastPrintTime; // last print time
unsigned long totalMeasurements; // total measurements
float totalValue; // total value
float highestValue; // highest value
float lowestValue; // lowest value

//sensor fuct
float readSensorValue() {
  return random (0, 100);
}

//average function
void printSummary() {
  unsigned long elapsedTime = millis() - startTime;
  unsigned long totalMinutes = elapsedTime / 60000;

  //pint average
  float overallAverage = totalValue / totalMeasurements;
  Serial.print("Overall Average: ");
  Serial.println(overallAverage);

  //print high and low values
  Serial.print("Highest Value ");
  Serial.println(highestValue);
  Serial.print("Lowest Value: ");
  Serial.println(lowestValue);

  //print every 10 mins
  Serial.println("10-minute Averages:");
  for (unsigned long i = 0; i < totalMinutes; i += 10) {
    float average = totalValue / totalMeasurements;
    Serial.print("Minute ");
    Serial.print(i);
    Serial.print(" Average: ");
    Serial.println(average);
  }
}


void setup() {
  Serial.begin(115200); // Starts the serial communication
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  
  //Variables
  startTime = millis();
  lastPrintTime = startTime;
  totalMeasurements = 0;
  totalValue = 0;
  highestValue = -INFINITY;
  lowestValue = INFINITY;
}

void loop() {
 //measurements
    unsigned long currentTime = millis();
    unsigned long Interval = 1000; //define the interval in milliseconds

    if (currentTime - lastPrintTime >= Interval) {
      //read sensor value
      float value = readSensorValue();

      //update all measurements
      totalValue += value;
      totalMeasurements++;

      //update highest and lowest values
      if (value > highestValue) {
        highestValue = value;
      }
      if (value < lowestValue) {
        lowestValue = value;
      }
      // summary
      printSummary();

      //update print time
      lastPrintTime = currentTime;
    }
}