Introduction: BMP280 Barometric Pressure Sensor

Picture of BMP280 Barometric Pressure Sensor

The BMP280 is a small sensor that measures Barometric Pressure (the weight of the air), temperature, and as a result elevation as well. I became interested in this sensor to measure the elevation of a model rocket at it's peak, but can also be used for weather sensing, or even predicting optimal fish biting times!

The BMP280 is fairly easy to setup and use, is very cheap, and impressively accurate (±1 hPa).

Step 1: Parts

Picture of Parts

For this setup you will need the following:

BMP280

Arduino Uno or one of its variants

Male to Female Jumper Wires

Step 2: Wiring

Picture of Wiring

In this example connect the following BMP280 pins to the Arduino respectively, VCC to 3.3V, GND to GND, SCL to A5, and SDA to A4.

Step 3: Libraries

Picture of Libraries

Before we get to the actual code you will need to install the following libraries:

Once the libraries are downloaded, place them in the Arduino>Libraries folder. Go to the Adafruit_BMP_280 library folder and open Adafruit_BMP280.h using notepad. Find the I2C address and change it to 0x76 (see photo). Save and close.

Step 4: Sketch

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Download and upload the attached sketch. Use the serial monitor to see what your new sensor is picking up. To use this in future projects, consider utilizing a Data Logging Shield to record your findings remotely.

Comments

perryp11 (author)2017-11-14

odd...

wired everything up as per the instructions.

loaded the libraries...

Changed the address to 0x76...

And nothing!.......

I keep getting the check wiring message?

perryp11 (author)perryp112017-11-14

I also ran the scanner software to find the bmp's address....0x76

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