PROJECT #4 - Trying Out BMP280 External Sensor On ESP32 Dev Board Using The Arduino IDE

Hello again! This time I'm going to try using an external sensor on my ESP32 since last week I've tried using the ESP32's internal sensor. For the sensor, I'm using a BMP280 barometric pressure module that consists of 3 sensors: temperature, air pressure, and altitude. Without further ado, let's get to the project!


STEP 1: Prepare The Required Software and Hardware

For hardware, you'll need these components:

  • ESP32 Development Board
  • Breadboard
  • Jumper Wire Male-to-Male
  • BMP280 Barometric Pressure Module
BMP280

For software, you'll need to set up the Arduino IDE. If you haven't set it up yet, you can click here to see the installation process from my first project in the first step from the first part.


STEP 2: Set Up The Hardware

Firstly, put the ESP32 Dev Board and the BMP280 on the breadboard. After that, connect a jumper wire from the ESP32 pins to the BMP280. For the details, see below :

  • 3V3 pin (dev board) to VCC pin (sensor)
  • GND pin (dev board) to GND pin (sensor)
  • GPIO 22 pin (dev board) to SCL pin (sensor)
  • GPIO 21 pin (dev board) to SDA pin (sensor)

You can refer to the image below for reference.


BMP280 Pin Location

Circuit View




STEP 3: Program The Dev Board

For this project's program, I'm using an example sketch file from the Adafruit BMP280 Library. If you haven't installed it yet, you can go to Tools -> Manage Libraries then search "Adafruit BMP280" and click install. Make sure you install all the libraries when prompted "install all" or "install this only".


Adafruit BMP280 Library Location


 After you install the library, you can go to Examples -> Adafruit BMP280 Library (Scroll down if you didn't find it) -> bmp280test to access the program I'm using for this project.


bmp280test Sketch File Location

bmp280test Sketch Code (1)

bmp280test Sketch Code (2)

After preparing the sketch file, verify and upload the program to the ESP32. 




STEP 4: Check The Result and Debug If Necessary

After resetting the Dev board, go to Serial Monitor to see the result of the sensor's reading. The result should be like in the image below. 


Experiment View

Sensor Result

If you see an error message like the image below, you must use the I2C scanner program to scan for the sensor's address. You can get the sketch code here. After getting the address, insert it to the first program (bmp280test) in the bmp.begin("address goes here"). Then you can re-upload the program and test it again. 


Error Message

I2C Scanner Result

That's all for this project! Thank you for reading and happy experimenting! 



- Ryu / 18220025

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