IoT project of Temperature and Pressure measurement using Pressure sensor BMP180 and Arduino device

In this project, we are going to build a temperature and pressure measuring system. In this project, we will use a pressure sensor model BMP180 to detect temperature and pressure, Arduino device and 16 X 2 characters LCD to display temperature and pressure.

Hardware requirements

Arduino UNO board
USB cable connector for Arduino device
Pressure Sensor BMP180
16 X 2 Character LCD Display
Project Board
Jumper wires (male to female, male to male)

Software requirement

Arduino software IDE

The working principle of Pressure Sensor BMP180

The pressure sensor BMP180 consists of a piezo-resistive sensor, an analog and digital converter, control unit with E2PROM and a serial I2C interface. It delivers the contributed values of temperature and pressure. The microcontroller of the sensor device sends the start sequence to measure temperature and pressure. The temperature and pressure can be read over 16 X 2 characters LCD.

The calculated temperature and pressure are measured in ℃, and hPa (hector Pascal) respectively. In this case, the rate of measuring temperature and pressure is once per second.

IoT project of Temperature and Pressure measurement using Pressure sensor BMP180 and Arduino device

Write an Arduino program to measure temperature and pressure using pressure sensor BMP180 and character LCD display.

#include <Adafruit_BMP085.h>
#include <Wire.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);//RS,EN,D4,D5,D6,D7

char PRESSURESHOW[4];// initializing a character of size 4 to display pressure result
char TEMPERATURESHOW[4];// initializing a character of size 4 to display temperature result
Adafruit_BMP085 bmp;

void setup() {
  lcd.begin(16, 2);
  // Print a logo message to the LCD.
  lcd.print(" BMP180 Sensor");
  lcd.setCursor(0, 1);
  lcd.print("Temp. & Pressure");
  lcd.setCursor(0, 2);
  delay (3000);

  lcd.clear();//clear display
  Serial.begin(9600);
  if (!bmp.begin()){
    Serial.println("ERROR");///if there is an error in communication
    while (1) {}
  }
}
void loop(){
  lcd.print("Pressure= "); // print pressure
  String PRESSUREVALUE = String(bmp.readPressure());
  // convert pressure reading to a char array
  PRESSUREVALUE.toCharArray(PRESSURESHOW, 4);
  lcd.print(PRESSURESHOW);
  lcd.print("hPa ");
  lcd.setCursor(0, 1);
  lcd.print("Temperature=");// print temperature
  String TEMPERATUREVALUE = String(bmp.readTemperature());
  // convert the reading to a char array
  TEMPERATUREVALUE.toCharArray(TEMPERATURESHOW, 4);
  lcd.print(TEMPERATURESHOW);
  lcd.print("C ");
  lcd.setCursor(0,0);//set the cursor to row and column 0, line1
  delay(500);
}

Include the BMP180 library before compiling the above code otherwise, it generates an error Adafruit_BMP085.h file or library not found.

To include library click Sketch > Include Library > Manage Libraries...