#include <Wire.h>

#define LM75A_ADDR 0x48    // I2C address of M2M_LM75A temperature sensor

const unsigned long MEASUREMENT_INTERVAL = 1000;  // Interval between measurements in milliseconds
const unsigned long SUMMARY_INTERVAL = 600000;    // Interval for summary output in milliseconds (10 minutes)
const unsigned long TOTAL_RUN_TIME = 86400000;    // Total run time in milliseconds (24 hours)

unsigned long previousMeasurementTime = 0;
unsigned long previousSummaryTime = 0;
unsigned long startTime = 0;
float totalTemperature = 0.0;
unsigned int numMeasurements = 0;
float highestTemperature = -273.15;  // Absolute zero as initial value
float lowestTemperature = 1000.0;    // High initial value

void setup() {
  Serial.begin(9600);
  Wire.begin();
  startTime = millis();
}

void loop() {
  unsigned long currentMillis = millis();

  // Perform a measurement every MEASUREMENT_INTERVAL milliseconds
  if (currentMillis - previousMeasurementTime >= MEASUREMENT_INTERVAL) {
    previousMeasurementTime = currentMillis;
    float temperature = readTemperature();
    totalTemperature += temperature;
    numMeasurements++;

    if (temperature > highestTemperature) {
      highestTemperature = temperature;
    }

    if (temperature < lowestTemperature) {
      lowestTemperature = temperature;
    }
    
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");
  }

  // Output summary information every SUMMARY_INTERVAL milliseconds
  if (currentMillis - previousSummaryTime >= SUMMARY_INTERVAL) {
    previousSummaryTime = currentMillis;
    printSummary();
  }

  // Stop the program after reaching the total run time
  if (currentMillis - startTime >= TOTAL_RUN_TIME) {
    printSummary();
    while (true) {
      // Do nothing, program stops here
    }
  }
}

float readTemperature() {
  Wire.beginTransmission(LM75A_ADDR);
  Wire.write(0);  // Register address for temperature reading
  Wire.endTransmission(false);
  Wire.requestFrom(LM75A_ADDR, 2);
  if (Wire.available()) {
    int msb = Wire.read();
    int lsb = Wire.read();
    float temperature = ((msb << 8) | lsb) / 256.0;
    return temperature;
  }
  return -273.15;  // Return absolute zero if reading fails
}

void printSummary() {
  unsigned long elapsedTime = millis() - startTime;
  unsigned int numAverages = elapsedTime / SUMMARY_INTERVAL;
  float overallAverage = totalTemperature / numMeasurements;

  Serial.println();
  Serial.println("----- Summary -----");
  Serial.print("Elapsed time: ");
  Serial.print(elapsedTime / 60000);
  Serial.println(" minutes");
  Serial.print("Number of measurements: ");
  Serial.println(numMeasurements);
  Serial.print("Overall average temperature: ");
  Serial.print(overallAverage);
  Serial.println(" °C");
  Serial.print("Highest temperature: ");
  Serial.print(highestTemperature);
  Serial.println(" °C");
  Serial.print("Lowest temperature: ");
  Serial.print(lowestTemperature);
  Serial.println(" °C");

  Serial.println("10-minute averages:");
  unsigned int count = 1