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BMP180

Overview

In this tutorial, we delve into the GY-87 IMU module, focusing on the BMP180 sensor for measuring temperature, pressure, and altitude. Ideal for applications like weather monitoring and altitude tracking, this lesson covers interfacing the GY-87 with an Arduino Uno and using the Adafruit BMP085 library. You’ll learn how to initialize the BMP180 sensor and read its data on the Arduino Serial Monitor, a crucial skill for projects that require environmental data.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name

ITEMS IN THIS KIT

LINK

Elite Explorer Kit

300+

Elite Explorer Kit

You can also buy them separately from the links below.

COMPONENT INTRODUCTION

PURCHASE LINK

Arduino Uno R4 WiFi

-

Jumper Wires

BUY

GY-87 IMU module

-

Wiring

../_images/09-gy87_bb1.png

Schematic Diagram

../_images/09_basic_gy87_schematic.png

Code

Note

  • You can open the file 09-gy87_bmp180.ino under the path of elite-explorer-kit-main\basic_project\09-gy87_bmp180 directly.

  • Or copy this code into Arduino IDE.

Note

To install the library, use the Arduino Library Manager and search for “Adafruit BMP085 Library” and install it.

09-gy87_bmp180.ino
 1/*
 2  This Arduino code interfaces with the GY-87 IMU (Inertial Measurement Unit) module, 
 3  specifically using the BMP180 sensor for measuring temperature, pressure, and 
 4  calculating altitude. It initializes the BMP180 sensor and continuously outputs its 
 5  readings to the Serial Monitor.
 6  
 7  Board: Arduino Uno R4
 8  Component: GY-87 IMU Module
 9  Library: https://github.com/adafruit/Adafruit-BMP085-Library  (Adafruit BMP085 Library by Adafruit)
10*/
11
12// Include required libraries
13#include <Adafruit_BMP085.h>
14
15// Initialize sensor objects
16Adafruit_BMP085 bmp;
17
18void setup() {
19  // Initialize the serial communication with a baud rate of 9600
20  Serial.begin(9600);
21
22  // Initialize BMP180 barometric sensor
23  initializeBMP180();
24}
25
26void loop() {
27  // Print BMP180 data
28  printBMP180();
29
30  delay(500);
31}
32
33void initializeBMP180() {
34  // Start BMP180 initialization
35  if (!bmp.begin()) {
36    Serial.println("Could not find a valid BMP180 sensor, check wiring!");
37    while (1)
38      ;  // Halt if sensor not found
39  }
40  Serial.println("BMP180 Found!");
41}
42
43void printBMP180() {
44  Serial.println();
45  Serial.println("BMP180 ------------");
46  Serial.print("Temperature = ");
47  Serial.print(bmp.readTemperature());
48  Serial.println(" *C");
49
50  Serial.print("Pressure = ");
51  Serial.print(bmp.readPressure());
52  Serial.println(" Pa");
53
54  // Calculate altitude assuming 'standard' barometric
55  // pressure of 1013.25 millibar = 101325 Pascal
56  Serial.print("Altitude = ");
57  Serial.print(bmp.readAltitude());
58  Serial.println(" meters");
59
60  Serial.print("Pressure at sealevel (calculated) = ");
61  Serial.print(bmp.readSealevelPressure());
62  Serial.println(" Pa");
63  Serial.println("BMP180 ------------");
64  Serial.println();
65}

Code Analysis

  • initializeBMP180()

    Initialize the BMP180 sensor.

    void initializeBMP180() {
  // Start BMP180 initialization
  if (!bmp.begin()) {
    Serial.println("Could not find a valid BMP180 sensor, check wiring!");
    while (1)
      ;  // Halt if sensor not found
  }
  Serial.println("BMP180 Found!");
}

  • printBMP180()

    Print the values ​​read by the BMP180 sensor.

    void printBMP180() {
  Serial.println();
  Serial.println("BMP180 ------------");
  Serial.print("Temperature = ");
  Serial.print(bmp.readTemperature());
  Serial.println(" *C");

  Serial.print("Pressure = ");
  Serial.print(bmp.readPressure());
  Serial.println(" Pa");

  // Calculate altitude assuming 'standard' barometric
  // pressure of 1013.25 millibar = 101325 Pascal
  Serial.print("Altitude = ");
  Serial.print(bmp.readAltitude());
  Serial.println(" meters");

  Serial.print("Pressure at sealevel (calculated) = ");
  Serial.print(bmp.readSealevelPressure());
  Serial.println(" Pa");
  Serial.println("BMP180 ------------");
  Serial.println();
}