/*
 * Display values from BME280 on LCD1602-I2C or LCD2004
 * 
 * Written/Updated by Ahmad Shamshiri on July 27, 2019 at 18:42 
 * in Ajax, Ontario, Canada for Robojax.com
 * Watch video instructions for this code: https://youtu.be/mXY_6LOekkw
 * 
  This is a library for the BME280 humidity, temperature & pressure sensor

  Designed specifically to work with the Adafruit BME280 Breakout
  ----> http://www.adafruit.com/products/2650

  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
  to interface. The device's I2C address is either 0x76 or 0x77.

  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_BME280.h>

#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme; // I2C
const int bmeVinPin = 12;// 5V pin for BME280

#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x27 or 0x3F for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x3F, 16, 2);


void setup() {
    pinMode(bmeVinPin, OUTPUT);// set pin as output
    digitalWrite(bmeVinPin,HIGH);// always keep it high (5V) for BMB280 module
    bool status;
    
    // default settings
    // (you can also pass in a Wire library object like &Wire2)
    status = bme.begin();  
    if (!status) {
        Serial.println("Could not find a valid BME280 sensor, check wiring!");
        while (1);
    }
  // initialize the LCD, 
  lcd.begin();
  // Turn on the blacklight and print a message.
  lcd.backlight();     
  lcd.print("Robojax Video");
  lcd.setCursor (0,1); // go to start of 2nd line
  lcd.print("BME280 Test");
  delay(2000);

}


void loop() { 
    // Robojax.com BME280 Code
   lcd.clear();// clear previous values from screen
lcdDisplay(
             // to print Celsius:
             0, // character 0 
             0, // line 0
             "Celsius: ", 

             // to print Celsius
             99, // character undefined
             0, // line 0
             getBME('C'),
             'd'
             );  
             
  lcdDisplay(
             // to print Fahrenheit:
             0, // character 0 
             1, // line 1
             "Fahr.: ", 

             // to print Fahrenheit
             99, // character undefined
             1, // line 0
             getBME('F'),
             'd'
             );     
    delay(5000);
  lcd.clear();// clear previous values from screen    
lcdDisplay(
             // to print Kelvin:
             0, // character 0 
             0, // line 0
             "Kelvin :", 

             // to print Celsius
             99, // character undefined
             0, // line 0
             getBME('K'),
             'k'
             );      
  lcdDisplay(
             // to print humidity text
             0, // character 0 
             1, // line 1
             "Humidity: ", 

             // to print humidity
             99, // character undefined
             1, // line 1
             getBME('H'),
             '%' 
             );  
    delay(5000); 
  lcd.clear();// clear previous values from screen    
lcdDisplay(
             // to print pressure text
             0, // character 0 
             0, // line 1
             "Pres.:", 

             // to print pressure
             99, // character undefined
             0, // line 1
             getBME('P'),
             'p' 
             );  
  lcdDisplay(
             // to print altitude text
             0, // character 0 
             1, // line 1
             "Ap. Alt.:", 

             // to print Altitude
             99, // character undefined
             1, // line 1
             getBME('A'),
             'm' 
             );                   
        delay(5000);

     // Robojax.com BME280 Code
}// loop end



/*
 * @brief returns temperature or relative humidity
 * @param "type" is character
 *     C = Celsius
 *     K = Kelvin
 *     F = Fahrenheit
 *     H = Humidity
 *     P = Pressure
 *     A = Altitude
 * @return returns one of the values above
 * Usage: to get Fahrenheit type: getBME('F')
 * to print it on serial monitor Serial.println(getBME('F'));
 * Written by Ahmad Shamshiri on July 13, 2019. Updated July 25, 2019
 * in Ajax, Ontario, Canada
 * www.Robojax.com 
 */
float getBME(char type)
{
   // Robojax.com BME280 Code
  float value;
    float temp = bme.readTemperature();
  if(type =='F')
   {
    value = temp *9/5 + 32;//convert to Fahrenheit 
   }else if(type =='K')
   {
    value = temp + 273.15;//convert to Kelvin
   }else if(type =='H')
   {
    value = bme.readHumidity();// read humidity
   }else if(type =='P')
   {
    value = bme.readPressure() / 100.0F; // read pressure
   }else if(type =='A')
   {
    value = bme.readAltitude(SEALEVELPRESSURE_HPA);// read altitude
   }else{
    value = bme.readTemperature();// read temperature
   }
   return value;
    // Robojax.com BME280 Code
}//getBME



/*
 * lcdDisplay(int tc, int tr, String title, int vc, int vr, float value)
 * displays value and title on LCD1602
 * How to use:
 * If you want to display: "Temp.: 340.45K" starting from the first character
 * on the second row.
 * use:
 * lcdDisplay(0, 1, "Temp.: ", 340.45,'K')
 *   
 *   'd' is degree symbol
 * tc  is character number  (0)
 * tr is row in the lcd (1)
 * title is the text (Voltage:)
 * vc value for character 
 * vr value for  row or line
 * value is the value (13.56)
 */
void lcdDisplay(int tc, int tr, String title, int vc, int vr, float value,char symbol)
{
   // Robojax.com LCD1602 for BME280 Demo

   lcd.setCursor (tc,tr); //
   lcd.print(title);
   if(vc !=99)
   {
   lcd.setCursor (vc,vr); //
   }   
   lcd.print(value);
   if(symbol == 'd')
   {
    lcd.print((char)223);
   }else if(symbol =='%')
   {
    lcd.print("%");
   }else if(symbol =='k')
   {
    lcd.print("K");
   }else if(symbol =='p')
   {
    lcd.print("hPa");
   }else if(symbol =='m')
   {
    lcd.print("m");
   }
 // Robojax.com LCD1602 for BME280 Demo
}