/*
 * Lesson 96: Using Precision BMP390 Barometric Pressure and Temperature Sensor
 * with Arduino using it as a Thermostat to control a heater or cooler
 * 
 * Watch video instruction on YouTube:  https://youtu.be/XevQYG_A5xA
 * 
 * Code updated by Ahmad Shamshiri for Robojax.com
 * on Jan 13, 2022 at 17:10 in Ajax, Ontario, Canada
  
  This video is part of the Arduino Step by Step Course which starts here: https://youtu.be/-6qSrDUA5a8
 

If you found this tutorial helpful, please support me so I can continue creating content like this
and make a donation using PayPal http://robojax.com/L/?id=64


  This is a library for the BMP390 temperature & pressure sensor

  Designed specifically to work with the Adafruit BMP388 Breakout
  ----> http://www.adafruit.com/products/3966

  These sensors use I2C or SPI to communicate; 2 or 4 pins are required
  to interface.

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing products
  from Adafruit!

  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 **************************************************************************
 */
#include <Wire.h>

#include <Adafruit_Sensor.h>
#include "Adafruit_BMP3XX.h"


#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BMP3XX bmp;
int bmpVCCPin = 12;//define pin 12 as VCC for bmp sensor

// all thermostat settings

const int relayPin =8;
const int relayON = HIGH;// 
const int relayOFF = LOW; //
int relayState = relayOFF;//initial state of relay

const int TEMPERATURE_UNIT =1;//1=Celsius, 2=Fahrenheit, 3=Kelvin
const float START_TEMPERATURE = 32.0;//unit above
const float STOP_TEMPERATURE = 45.0;//unit above
const int CONTROL_TYPE = 2;// 1= heater, 2=cooler

//do not change the line below
float temperature, pressure, altitude;



void setup() {
  Serial.begin(9600);
  while (!Serial);
  Serial.println("Adafruit BMP388 / BMP390 test");

  pinMode(bmpVCCPin, OUTPUT);// set pin as output
  digitalWrite(bmpVCCPin,HIGH);// always keep it high (5V) for BMB390 module
  delay(500);//wait for the bmpVCCPin to turn ON.    

  
  pinMode(relayPin, OUTPUT);//pin for relay
  digitalWrite(relayPin, relayState);//change initial state of relay


  if (!bmp.begin_I2C()) {   // hardware I2C mode, can pass in address & alt Wire
  Serial.println("Could not find a valid BMP3 sensor, check wiring!");
    while (1);
  }

  // Set up oversampling and filter initialization
  bmp.setTemperatureOversampling(BMP3_OVERSAMPLING_8X);
  bmp.setPressureOversampling(BMP3_OVERSAMPLING_4X);
  bmp.setIIRFilterCoeff(BMP3_IIR_FILTER_COEFF_3);
  bmp.setOutputDataRate(BMP3_ODR_50_HZ);


  
  
}

void loop() {
  if (! bmp.performReading()) {
    Serial.println("Failed to perform reading :(");
    return;
  }
    readValues();
    printTemperature();

  Serial.println();
   loadControl(); 

   //do extra action if temperature is greater than 89.5
   if(temperature >=89.5)
   {
    ///and your code here
   }
  delay(2000);//wait 2 seconds or make is less or more
}



/*
 * loadControl()
 * @brief controls the load based 
 * @param state can be either : relayON or relayOFF

 * @return returns none
 * Written by Ahmad Shamshiri for robojax.com
 * on Jan 15, 2022 at 08:11 in Ajax, Ontario, Canada
 */
void loadControl()
{
//Robojax.com heater/cooler with BMP390 Thermocoupler  
     // Serial.print("Start: ");
     // Serial.print(START_TEMPERATURE);
     // Serial.print(" Stop: ");
      //Serial.println(STOP_TEMPERATURE);      
  if(CONTROL_TYPE ==1)
  {
    if(START_TEMPERATURE >= temperature && STOP_TEMPERATURE >=temperature)
    {
      relayControl(relayON);
    }
    if(STOP_TEMPERATURE <=temperature)
    {
      relayControl(relayOFF);
    }
  }else{
    if(START_TEMPERATURE >= temperature && STOP_TEMPERATURE >=temperature)
    {
      relayControl(relayOFF);
    }
    if(STOP_TEMPERATURE <=temperature)
    {
      relayControl(relayON);
    }
  }
    
//Robojax.com heater/cooler with BMP390 Thermocoupler
}//loadControl()


/*
 * relayControl(int state))
 * @brief turns the relay ON or OFF
 * @param state is "relayON" or "relayOFF" defined at the top of the code
 * @return returns none
 * Written by Ahmad Shamshiri for robojax.com
 * on May 20, 2020 at 15:23 in Ajax, Ontario, Canada
 */
void relayControl(int state)
{
  //Robojax.com heater/cooler with BMP390 Thermocoupler
  if(state ==relayON)
  {
    digitalWrite(relayPin, relayON);
    Serial.println("Relay ON");   
  }else{
   digitalWrite(relayPin, relayOFF);    
    Serial.println("Relay OFF");   
  }
  //Robojax.com heater/cooler with BMP390 Thermocoupler  

}//relayControl()


/*
 *  readValues()
 * @brief reads the temperature based on the TEMPERATURE_UNIT
 * @param average temperature

 * @return returns one of the values above
 * Written by Ahmad Shamshiri for robojax.com
 * on Jan 15, 2022 at 08:02 in Ajax, Ontario, Canada
 */
void readValues()
{
 //Robojax.com heater/cooler with BMP390 Thermocoupler 

  altitude =  bmp.readAltitude(SEALEVELPRESSURE_HPA);// read altitude
  pressure = bmp.pressure / 100.0F; // get  pressure in hecto pascal
  
  
  if(TEMPERATURE_UNIT ==2)
   {
   temperature = bmp.temperature *9/5 + 32;//convert to Fahrenheit 
   }else if(TEMPERATURE_UNIT ==3)
   {
    temperature = bmp.temperature + 273.15;//convert to Kelvin
   }else{
    temperature = bmp.temperature;// return Celsius
   }    
 //Robojax.com heater/cooler with BMP390 Thermocoupler 
}// readValues()


/*
 * printTemperature()
 * @brief prints  temperature on serial monitor
 * @param character type
 * @param "type" is character
 *     C = Celsius
 *     K = Kelvin
 *     F = Fahrenheit
 * @return none
 * Written by Ahmad Shamshiri for robojax.com
 * on Jan 15, 2022 at 08:09 in Ajax, Ontario, Canada
 * www.Robojax.com
 */
void printTemperature()
{
//Robojax.com heater/cooler with BMP390 Thermocoupler
   Serial.print(temperature);
    printDegree();    
  if(TEMPERATURE_UNIT ==2)
   {
     Serial.print("F");
    }else if(TEMPERATURE_UNIT ==3)
   {
     Serial.print("K");
   }else{
     Serial.print("C");
   }    
  Serial.println();
//Robojax.com heater/cooler with BMP390 Thermocoupler  
}//printTemperature()

/*
 * @brief prints degree symbol on serial monitor
 * @param none
 * @return returns nothing
 * Written by Ahmad Shamshiri on July 13, 2019
 * for Robojax Tutorial Robojax.com
 */
void printDegree()
{
    Serial.print("\\xC2"); 
    Serial.print("\\xB0");  
}