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qdg-pi

Python script that runs on a Raspberry Pi and publishes data from an array of multiplexed BME280 sensors to a host computer via redis. This project uses the TCA9548A I2C multiplexer.

Instructions:

  1. First enable I2C on the pi by following this guide:

https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c

  1. Configure the timezone on the pi by running the following command:
sudo dpkg-reconfigure tzdata

  1. Run pi-setup.py to install python dependencies and add cronjob for starting the publishing script if the pi reboots

  2. Edit publish-data.py and change the ip_address variable to point to the host computer

How It Works

The publishing script writes a single byte to the multiplexer I2C address to select which sensor to read.

By using redis, a database server running on the host computer, the pi can create a "pubsub" channel to which it publishes data collected from the connected sensors. The host computer subscribes to this channel and saves the data into csv format.