BMP180 Library for Arduino

 

The BMP180 Library for Arduino is a lightweight and efficient library written in C/C++ designed to facilitate communication with the BMP180 Barometric Pressure/Temperature Sensor. This library allows developers to seamlessly integrate the BMP180 sensor into their Arduino projects, enabling accurate measurement of atmospheric pressure, temperature, and altitude.

Key Features

1. Simplified Sensor Communication

• Implements the I²C (Inter-Integrated Circuit) communication protocol to ensure reliable data exchange between the Arduino microcontroller and the BMP180 sensor.

2. Pressure and Temperature Measurements

• Reads and processes barometric pressure and temperature data directly from the sensor.

3. Altitude Calculation

• Calculates the approximate altitude above sea level based on pressure readings, making it ideal for weather, navigation, and environmental monitoring projects.

4. Flexible Integration

• Easily integrates into Arduino sketches, allowing developers to quickly add BMP180 functionality to their projects.

5. Open-Source Design

• Written in C/C++, the library is customizable, enabling developers to adapt it to specific use cases or extend its functionality.

Technology Stack

Programming Language

• C/C++: Optimized for embedded systems and Arduino microcontrollers.

Hardware Communication Protocol

• I²C Protocol: Enables efficient communication with the BMP180 sensor using minimal pins.

Arduino Framework

• Compatible with the Arduino platform, ensuring easy deployment on a wide range of microcontroller boards.

How It Works

1. I²C Communication

• The library initializes the BMP180 sensor and establishes communication via the SDA (Serial Data Line) and SCL (Serial Clock Line) pins.

2. Reading Sensor Data

• It sends commands to the sensor to retrieve raw data for pressure and temperature.

3. Data Processing

• Converts the raw sensor readings into meaningful values using the sensor's datasheet formulas.

4. Altitude Calculation (Optional)

• Computes the altitude based on the pressure data and a reference pressure at sea level.

Sample Code

#include "Wire.h"
#include "Tarsier_BMP180.h"



float _temperature;
float _pressure;
float _atm;
float _altitude;
float _sealevel;

Tarsier_BMP180 _bmp;

void setup()
{
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
  Serial.println("Serial success...");
  // join I2C bus (I2Cdev library doesn't do this automatically)
  Wire.begin();
  if(!_bmp.init()){
	  Serial.println("BMP180 connection failed...");
  }

}

void loop() {
  _temperature	= _bmp.getTemperature(_bmp.readUT());	//Get the temperature, ReadUT MUST be called first to start temperature measurement
  _pressure		= _bmp.getPressure(_bmp.readUP());			//Get the calculated pressure
  _altitude		= _bmp.getAltitude(_pressure);				//calculate absolute uncompensated altitude - in Meters
  _sealevel		= _bmp.calcPressureAtSeaLevel(_pressure, _altitude);
  _atm			= _pressure / 1013.25;

  Serial.print("Temperature: ");
  Serial.print(_temperature, 2);						//display 2 decimal places
  Serial.println(" °C");

  Serial.print("Pressure: ");
  Serial.print(_pressure, 0);							//whole number only.
  Serial.println(" Pa");

  Serial.print("Pressure At Sea level: ");
  Serial.print(_sealevel, 2);							//display 2 decimal places
  Serial.println(" Pa");

  Serial.print("Ralated Atmosphere: ");
  Serial.println(_atm, 4);								//display 4 decimal places

  Serial.print("Altitude: ");
  Serial.print(_altitude, 2);							//display 2 decimal places
  Serial.println(" m");

  Serial.println();
  delay(1000);

}

The BMP180 Library for Arduino simplifies the integration of the BMP180 sensor into Arduino projects, making it an indispensable tool for hobbyists and professionals alike. With its robust features and ease of use, this library empowers developers to create innovative solutions for weather monitoring, navigation, and more.