/* Display temperature from BMP180 as bargraph on LCD 
 *  Original Sources: 
 *  BMP180 library from https://www.sparkfun.com/products/11824
 *  LCD library: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
 *  Bargraph library from https://playground.arduino.cc/Code/LcdBarGraph/
 *  
 *  
 *  Written and updated by Ahmad Shamshiri on June 05, 2019
 *  for Robojax in Ajax, Ontario
  Watch video tutorial for this code: https://youtu.be/0IojNYgDD7U
  If you need the schematic diagram of this circuit, please visit  http://bit.ly/rj-udemy

* Robojax Arduino Course on Udemy where you get the schematic diagram of this sketch 
 * and many other robotics-related lectures and codes. Purchase the course here: http://bit.ly/rj-udemy


- (GND) to GND
+ (VDD) to 3.3V

(WARNING: Do not connect + to 5V or the sensor will be damaged!)

*/

#include <SFE_BMP180.h>
#include <Wire.h>


SFE_BMP180 rjt;// creating object called "rjt" (robojax temperature)
#define UNIT 'C' // unit type C for Celsius F for Fahrenheit
#define maxTemperature 40 // is the value in Celsius or Fahrenheit set in line above

// LCD settings
#include <LiquidCrystal_I2C.h>
byte lcdNumCols = 16; // -- number of columns in the LCD
byte lcdLine = 2; // -- number of lines in the LCD

LiquidCrystal_I2C lcd(0x3f,lcdNumCols,lcdLine); //0x3f is address for I2C
                  // to get I2C address, run I2C Scanner. 
                  //Link is provided (in same page as this code) at http://robojax.com/learn/arduino
// bargraph settings
#include <LcdBarGraphRobojax.h>
LcdBarGraphRobojax robojax(&lcd, 16, 0, 0);  // -- creating 16 character long bargraph starting at char 0 of line 0 (see video)



void setup()
{
  Serial.begin(9600);//initialize serial monitor
 // -- initializing the LCD
  lcd.begin();
  lcd.clear();
  lcd.print("Robojax"); 
   
 
  // Initialize the sensor (it is important to get calibration values stored on the device).

  if (rjt.begin())
  {
   lcd.setCursor (0,1); //  
    lcd.print("BMP180 Bargraph");  
  }else {
    lcd.setCursor (0,1); //  
    lcd.print("BMP180 Failed"); 
    while(1); // Pause forever.
  }
  // -- give use some time to read the text above
  delay(2000);
  lcd.clear();  
}// setup

void loop()
{
 // Robojax BMP180 Bargraph main loop

 robojax.clearLine(1);// clear line 1 to display fresh temperature
 float T = getTemp();// get the temperature
 float Tgraph=T;
 if(T !=999){
     if( Tgraph > maxTemperature){   
        Tgraph =0;
     }
        robojax.drawValue( Tgraph, maxTemperature);// draw the bargraph     
      // Print out the measurement:
      Serial.print("temperature: ");
      Serial.print(T,2);


      lcd.setCursor (0,1); //
      if(T< maxTemperature){       
       lcd.print("Temp.:"); 
      }else{
       lcd.print("Max.:"); 
      }
      lcd.setCursor (7,1); //
      lcd.print(T); // print  
      lcd.print((char)223);// prints degree symbol
      if(UNIT =='C'){
        lcd.print("C");//
        Serial.println(" deg C");         
      }else{
        lcd.print("F");
        Serial.println(" deg F");         
      }
      
   



  }else{
    Serial.print("Status error");
      lcd.setCursor (0,1); //
      lcd.print("Error ");     
  }

delay(500);
}


/*
 * 
 * @brief gets the temperature in Celsius or Fahrenheit
 * @param unit, should be capital C or capital F, C=Celsius F=Fahrenheit
 * @return temperature in Celsius or Fahrenheit
 * Written by Ahmad Shamshiri for Robojax.com 
 * on Wednesday, June 5th, 2019 at 22:30 in Ajax, Ontario, Canada
 * 
 */
 ////////////////////////////////////////////
double getTemp(){
    char status;
  double Temp,newTemp;
 
status = rjt.startTemperature();
  if (status != 0)
  {
    // Wait for the measurement to complete:
    delay(status);

    // Retrieve the completed temperature measurement:
    // Note that the measurement is stored in the variable T.
    // Function returns 1 if successful, 0 if failure.

    status = rjt.getTemperature(Temp);
    if (status != 0)
    {  
      if (UNIT =='F')
      {
        newTemp = (9.0/5.0)*Temp+32.0;// convert to degrees Fahrenheit
      }else{
        newTemp = Temp;// keeps degree Celsius
      }
    }
    return newTemp;    
  }else{
    return 999;// if error, then return 999
  }
}//getTemp/////////////////////////////