•GND → GND

•SDA → A4

•SCL → A5

Note: You can also you the SDA and SCL lines on Arduino boards that

have them broken out. Make sure you edit the code accordingly if you use

those pins instead.

On an Arduino board connect the SDA pin on the breakout board to A4 and

SCL to A5. If you’re using a 5V Arduino Uno we recommend putting 330

ohm resistors in line to limit the 5V signal going into the sensor and prevent

damage to the sensor.

MPL311A2 Library and Functions

We’ve written an Arduino library and some example code to make using the

MPL3115A2 easy to get up and running. Grab the library here. Unzip and

paste the folder “MPL3115A2_Pressure” into your Arduino libraries folder.

Not sure how to install an Arduino library? Read here for more information.

Load the Pressure example

Once the library is installed, open Arduino, and expand the examples

menu. You should see the MPL3115A2_Pressure sub-menu. Load the

“Pressure” example onto the Arduino. Open the serial terminal at 9600bps.

You will see the current barometric pressure and temperature in the room!

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