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Lesson 30: Using BMP280 Temperature Sensor with LCD1602 | Arduino Step by Step Course

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Part 3: Temperature Sensors

In this lesson we learn how to use BMP280 to measure temperature and display it on LCD1602 as Celsius, fahrenheit and Kelvin. There is separate code for LCD2004


 /*
 /* 
 * Robojax Arduino Step By Step Course
 * Lesson 30,  Using BMEP280 with LCD1602 display
 
 *  
   Please watch video instruction here https://youtu.be/4IqMqveK38U
 This code is available at http://robojax.com/course1/?vid=lecture11
 
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 *  You can get this code from Robojax.com
 *  
 *  Original Libary source: https://github.com/ozhantr/DigitLedDisplay


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 * Code is available at http://robojax.com/learn/arduino

 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>. 
    

 */
/***************************************************************************
  This is a library for the BMP280 humidity, temperature & pressure sensor

  Designed specifically to work with the Adafruit BMEP280 Breakout
  ----> http://www.adafruit.com/products/2651

  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 andopen-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 <SPI.h>
#include <Adafruit_BMP280.h>

#define BMP_SCK  (13)
#define BMP_MISO (12)
#define BMP_MOSI (11)
#define BMP_CS   (10)

Adafruit_BMP280 bmp; // I2C
//Adafruit_BMP280 bmp(BMP_CS); // hardware SPI
//Adafruit_BMP280 bmp(BMP_CS, BMP_MOSI, BMP_MISO,  BMP_SCK);

// LCD1602 or LCD2004 settings

#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x3F for a 20 chars and 4 line display
LiquidCrystal_I2C lcd(0x3F, 16, 2);
// end of LCD1602 or LCD2004 settings

void setup() {
// initialize the LCD, 
  lcd.begin();
  // Turn on the blacklight and print a message.
  lcd.backlight();
  lcd.clear();
   lcd.setCursor (0,0); //

  if (!bmp.begin()) {
      lcd.print("BMP280 Error"); 
    while (1);
  }
  lcd.print("BMP280 Test"); 
  /* Default settings from datasheet. */
  bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,     /* Operating Mode. */
                  Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
                  Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
                  Adafruit_BMP280::FILTER_X16,      /* Filtering. */
                  Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */
}

void loop() {
  lcd.clear();// clearn previous values from screen
  lcd.setCursor (0,0); //character zero, line 1
  lcd.print("BMP280 Sensor"); // print text 

 // print distance in degrees C
  lcd.setCursor (0,1); //character 0, line 2
  lcd.print(getTemp('C'));// print Temperature Celsius
  lcd.setCursor (5,1); //character 6, line 2 
  lcd.print((char)223);// print degree 
  lcd.setCursor (6,1); //character 7, line 2 
  lcd.print("C");// print C
  
   // print distance degrees F
  lcd.setCursor (8,1); //character 9, line 2
  lcd.print(getTemp('F'));// F
  lcd.setCursor (14,1); //character 15, line 2 
  lcd.print((char)223);// print degree 
  lcd.setCursor (15,1); //character 16, line 2 
  lcd.print("F");// print F 
    delay(1000);
}// loop end

/*
 * Written by Ahmad Shamshiri 
 * Jan 22, 2019 in Ajax, Ontario, Canada
 * getTemp(char type)
 * returns temperature in either C, F or K
 * @param type is character of upper case 
 * C is used to get Celsius
 * F is used to get fahrenheit
 * K is used for Kelvin
 * Written by Ahmad Shamshiri for Robojax.com
 */
float getTemp(char type) {
    float c = bmp.readTemperature();//get main temperature in C
  float f = c * 9.0 / 5.0 + 32;// convert to fahrenheit
  if(type =='F')
  {
    return f;// fahrenheit
  }else if(type =='K')
  {
    return c + 274.15;// return Kelvin
  }else{
   return c; //return Celsius
  }
  
}//getTemp ends



   

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