Electricity Saving Device

// -----------------------------------------
// MEGR 3171 IoT project - Home Automation System (Group 1)
//Habeeb Almatar && John Gasson
// -----------------------------------------
// Soures: http://diotlabs.daraghbyrne.me/7-communicating-events/pir/
//         https://gist.github.com/zsup/9496462
//         http://community.garadget.com/t/instructions-for-home-grown-garadget-clone/69
//         https://docs.particle.io/tutorials/hardware-projects/maker-kit/
//         https://docs.particle.io/reference/device-os/firmware/photon/
// -----------------------------------------

#include <OneWire.h>

OneWire ds = OneWire(D4);       // Temperature sensor pin
int relay = D1;                 // Relay pin
int boardLed = D7;              // Photon onBoard LED
float light_threshold = 2000;   // Brightness to decide whether to switch light on
int analogvalue;                // Integer variable 'analogvalue', used later to store the value of the photoresistor.
int photoresistor = A0;         // This is where your photoresistor is plugged in. The other side goes to the "power" pin (A5).
int photopower = A5;             
float temperature;
float lastTemp;
unsigned long lastmillis = 0;

void setup(){
    
  Serial.begin(9600);

  pinMode(photoresistor,INPUT); 
  pinMode(photopower,OUTPUT);
  digitalWrite(photopower,HIGH);      
  pinMode(boardLed,OUTPUT); 
  pinMode(relay, OUTPUT);   
    
    Particle.variable("light", &photoresistor, INT);
    Particle.subscribe("light_status", myRelay, "4e003f000751373238323937");
}

void myRelay (const char *event, const char *data){
    if (strcmp(data,"On")==0) {
    
        digitalWrite(relay,LOW);
        delay(200);
  }
  else if (strcmp(data,"Off")==0) {
    
        digitalWrite(relay,HIGH);
        delay(200);
  }
}

void loop()
{
    //////////////////////Start of Photoresistor Code /////////////////////////////////////////////
    analogvalue = analogRead(photoresistor); // Read the photoresistor value
    delay(1000);
    Particle.publish("light", String(analogvalue));
    delay(1000);
    
    if (analogvalue <= light_threshold){ // Relay is NO(Normally Open) and "LOW" switches the light on
        digitalWrite(relay,LOW);
        Particle.publish("lightSwitch", "On");
        delay(200);
    }else{
        digitalWrite(relay,HIGH);
        Particle.publish("lightSwitch", "Off");
        delay(200);
    }
    
             if ((millis() - lastmillis) > 20000) {
                lastmillis = millis();
            }
  ////////////////////// End of Photoresistor Code /////////////////////////////////////////////
  
  //////////////////////Start of Temperature Sensor Code /////////////////////////////////////////////
  byte i;
  byte present = 0;
  byte type_s;
  byte data[12];
  byte addr[8];
  float celsius, fahrenheit;
  
  if ( !ds.search(addr)) {
    Serial.println("No more addresses.");
    Serial.println();
    ds.reset_search();
    delay(250);
    return;
  }

  // The order is changed a bit in this example
  // first the returned address is printed

  Serial.print("ROM =");
  for( i = 0; i < 8; i++) {
    Serial.write(' ');
    Serial.print(addr[i], HEX);
  }

  // second the CRC is checked, on fail,
  // print error and just return to try again

  if (OneWire::crc8(addr, 7) != addr[7]) {
      Serial.println("CRC is not valid!");
      return;
  }
  Serial.println();

  // we have a good address at this point
  // we will set a type_s value for known types or just return

  // the first ROM byte indicates which chip
  switch (addr[0]) {
    case 0x10:
      Serial.println("  Chip = DS1820/DS18S20");
      type_s = 1;
      break;
    case 0x28:
      Serial.println("  Chip = DS18B20");
      type_s = 0;
      break;
    case 0x22:
      Serial.println("  Chip = DS1822");
      type_s = 0;
      break;
    case 0x26:
      Serial.println("  Chip = DS2438");
      type_s = 2;
      break;
    default:
      Serial.println("Unknown device type.");
      return;
  }

  // this device has temp so let's read it

  ds.reset();               // first clear the 1-wire bus
  ds.select(addr);          // select the device found
  // ds.write(0x44, 1);     // tell it to start a conversion, with parasite power on at the end
  ds.write(0x44, 0);        // start conversion in powered mode (bus finishes low)

  // just wait a second while the conversion takes place
  // different chips have different conversion times, check the specs, 1 sec is worse case + 250ms
  // you could also communicate with other devices if you like but you would need
  // to already know their address to select them.

  delay(1000);     // Check 750ms

  // we might do a ds.depower() (parasite) here, but the reset will take care of it.

  // first make sure current values are in the scratch pad

  present = ds.reset();
  ds.select(addr);
  ds.write(0xB8,0);         // Recall Memory 0
  ds.write(0x00,0);         // Recall Memory 0

  // now read the scratch pad

  present = ds.reset();
  ds.select(addr);
  ds.write(0xBE,0);         // Read Scratchpad
  if (type_s == 2) {
    ds.write(0x00,0);       // The DS2438 needs a page# to read
  }

  // transfer and print the values

  Serial.print("  Data = ");
  Serial.print(present, HEX);
  Serial.print(" ");
  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] = ds.read();
    Serial.print(data[i], HEX);
    Serial.print(" ");
  }
  Serial.print(" CRC=");
  Serial.print(OneWire::crc8(data, 8), HEX);
  Serial.println();

  // Convert the data to actual temperature
  // because the result is a 16 bit signed integer, it should
  // be stored to an "int16_t" type, which is always 16 bits
  // even when compiled on a 32 bit processor.
  int16_t raw = (data[1] << 8) | data[0];
  if (type_s == 2) raw = (data[2] << 8) | data[1];
  byte cfg = (data[4] & 0x60);

  switch (type_s) {
    case 1:
      raw = raw << 3; // 9 bit resolution default
      if (data[7] == 0x10) {
        // "count remain" gives full 12 bit resolution
        raw = (raw & 0xFFF0) + 12 - data[6];
      }
      celsius = (float)raw * 0.0625;
      break;
    case 0:
      // at lower res, the low bits are undefined, so let's zero them
      if (cfg == 0x00) raw = raw & ~7;  // 9 bit resolution, 93.75 ms
      if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
      if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
      // default is 12 bit resolution, 750 ms conversion time
      celsius = (float)raw * 0.0625;
      break;

    case 2:
      data[1] = (data[1] >> 3) & 0x1f;
      if (data[2] > 127) {
        celsius = (float)data[2] - ((float)data[1] * .03125);
      }else{
        celsius = (float)data[2] + ((float)data[1] * .03125);
      }
  }

  // remove random errors
  if((((celsius <= 0 && celsius > -1) && lastTemp > 5)) || celsius > 125) {
      celsius = lastTemp;
  }

  fahrenheit = celsius * 1.8 + 32.0;
  lastTemp = celsius;
  Serial.print("  Temperature = ");
  Serial.print(celsius);
  Serial.print(" Celsius, ");
  Serial.print(fahrenheit);
  Serial.println(" Fahrenheit");

  
  String temperature = String(fahrenheit); // store temp in "temperature" string
  Particle.publish("temperature", temperature); 
  
  delay(1000);
}
////////////////////// End of Temperature Sensor Code /////////////////////////////////////////////