README.md

ros_mpl3115a2

A ROS node for communicating with the MPL3115A2 temperature, barometer, and altimeter sensor.

Description

The node communicates with the MPL3115A2 via i2c on the Raspberry Pi using Adafruit's Circuit Python library: https://learn.adafruit.com/using-mpl3115a2-with-circuitpython. The i2c address is preset to 0x60 which is the default. This is configurable if needed. The data is stored in the following:

• Temperature (C): mpl3115a2/temperature
• Pressure (Pascals): mpl3115a2/pressure
• Altimeter (m): mpl3115a2/altimeter

Installation Instructions

• Enable i2c

  sudo apt-get install i2c-tools
  i2cdetect -l
  

• Add i2c-devl to boot with sudo nano /etc/modules-load.d/modules.conf
• Install wiringpi sudo apt install wiringpi
• Connect i2c devices to Sparkfun Qwiic hat and run i2cdetect -y 1 to identify channels
• Install Circuit Python: https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi
• Install driver for MPL3115A2 Baro/Temp/Alt Sensor: sudo pip3 install adafruit-circuitpython-mpl3115a2.

Running the Node

• Option 1: rosrun ros_mpl3115a2 talker.py
• Option 2: roslaunch launches/pitemp.launch

Tested Setup

It should work on other versions but Python 3 is a requirement.

• Platform: Raspberry Pi 4
• OS: Ubuntu MATE 20.04
• ROS: Noetic
• Python: 3.8.5