UNCC 3171 IOT Project (Spring 2023 Group 8)

// This #include statement was automatically added by the Particle IDE.
#include <OneWire.h>

// Define the pin for the DS18B20 temperature sensor
const int TEMP_SENSOR_PIN = D2;

// Create an instance of the OneWire protocol object
OneWire oneWire(TEMP_SENSOR_PIN);

void setup() {
  // Enable serial communication for debugging
  Serial.begin(9600);
  // Connect to the Particle Cloud
  Particle.connect();
}

void loop() {
  // Read the temperature from the DS18B20 sensor
  float tempC = readTemperature();
  // Convert the temperature to Fahrenheit
  float tempF = tempC * 1.8 + 32;
  
  if (tempF > -999) {
    // Publish the temperature to the Particle Cloud
    Particle.publish("Temperature", String(tempF));
    // Print the temperature to the serial monitor for debugging
    Serial.printf("Temperature: %.2fF\n", String(tempF));
  }
  // Wait for a few seconds before reading the temperature again
  delay(1000);
}




// Helper function to read the temperature from the DS18B20 sensor using the OneWire protocol
float readTemperature() {
  byte data[9];
  byte addr[8];

  // Reset the OneWire bus
  oneWire.reset();

  // Search for a DS18B20 sensor on the bus
  if (!oneWire.search(addr)) {
    Serial.printf("No more sensors on the bus");
    // Return a negative temperature value to indicate an error
    return -1000;
  }

  // Check if the found device is a DS18B20
  if (OneWire::crc8(addr, 7) != addr[7]) {
    Serial.printf("CRC is not valid");
    // Return a negative temperature value to indicate an error
    return -1000;
  }

  // Send a command to start a temperature measurement
  oneWire.reset();
  oneWire.select(addr);
  oneWire.write(0x44);

  // Wait for the temperature conversion to complete (750ms for 12-bit resolution)
  delay(750);

  // Send a command to read the temperature
  oneWire.reset();
  oneWire.select(addr);
  oneWire.write(0xBE);

  // Read the temperature data
  for (byte i = 0; i < 9; i++) {
    data[i] = oneWire.read();
  }

  // Convert the temperature data to a temperature value
  int16_t rawTemp = (data[1] << 8) | data[0];
  float tempC = (float) rawTemp / 16.0;

  // Return the temperature in Celsius
  return tempC;
}

int pirPin = D2;
int ledPin = D3;
int pirValue;

void setup() {

  Serial.begin(9600);

  pinMode(pirPin, INPUT);

  pinMode(ledPin, OUTPUT);
}

void loop() {
  pirValue = digitalRead(pirPin);

  if (pirValue == HIGH) {
    digitalWrite(ledPin, LOW);
    Particle.publish("Motion detected!", String(pirValue));
    delay(1000);
  }
  else {
    Particle.publish("Motion not detected", String(pirValue));
    digitalWrite(ledPin, HIGH);
    delay(5000);
  }
}