Arduino

50 min

You may have asked yourself before how aircraft know their height above sea level while flying, in fact, planes know the height from the value of atmospheric pressure, In this tutorial we will explain the use of the BMP180 sensor for measuring atmospheric pressure and temperature.

Project Video

Overview

In this tutorial, we will learn how to work the BMP 180 pressure sensor with Arduino code to measure atmospheric pressure and temperature and altitude. This sensor has a very small shape through which the atmospheric pressure can be measured. Also, as this pressure decreases as it rises above sea level, it can also be used to get altitude.

Getting the Items

Arduino Uno R3 (Voltaat Version)

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Barometric Pressure Sensor (BMP180)

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Jumper Wires – Male to Female (40 Pack)

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Steps

Wiring it Up

Connect the wires between the BMP180 and the Arduino, as shown in the image below.

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Connections from the BMP180 to arduino :

• Vin → Arduino 5V pin

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• GND → Arduino GND pin

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• SCL → Arduino pin A5

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• SDA → Arduino pin A4

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Coding

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/*
Voltaat learn (http://learn.voltaat.com)
Link for full tutorial: put the link of the tutorial here

Tutorial: Measure_altitude_using_Bmp180!

The function of this sketch is to obtain the altitude from the BMP180 sensor and display it on your computer

Connections from the BMP180 to arduino :

• Vin → Arduino 5V pin
• GND → Arduino GND pin
• SCL → Arduino pin A5
• SDA → Arduino pin A4

*/

// First, add the BMP180 sensor library and the (wire) library to the code
#include "Wire.h"
#include "SFE_BMP180.h"

SFE_BMP180 bmp180;
/* Set here the value of the Po variable equal to the atmospheric pressure at sea level*/
float Po = 1005.0;

void setup() {
Serial.begin(9600);
bool success = bmp180.begin();

if (success) {
Serial.println("BMP180 init success");
}
}

void loop() {
char status;
double T, P, alt;
bool success = false;

status = bmp180.startTemperature();

if (status != 0) {
delay(1000);
status = bmp180.getTemperature(T);

if (status != 0) {
status = bmp180.startPressure(3);

if (status != 0) {
delay(status);
status = bmp180.getPressure(P, T);

if (status != 0) {
/* In this part of the code, we will only display the temperature and pressure values on the screen */

Serial.print("Pressure: ");
Serial.print(P);
Serial.println(" hPa");

Serial.print("Temperature: ");
Serial.print(T);
Serial.println(" C");

alt = bmp180.altitude(P, Po);
Serial.print("Altitude: ");
Serial.print(alt);
Serial.println(" Meters");
}
}
}
}
}