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Lab-Temperature-Humidity-Sensing

Code for continuous temperature and humidity sensing with a BME688 sensor

Hardware

  • BME688 sensor, with trace on back of board marked ADDR cut
  • Pi400

Setup

  • 2-6V connected to 3.3 VDC power (header pin 1)
  • SDA connected to GPIO8 (header pin 3)
  • SCL connected to GPIO9 (header pin 5)
  • GND connected to Ground (header pin 9)

Guide for monitoring temperature and humidty at set time points

  1. copy forked link from Github and git clone https://github.com/pimoroni/bme680-python.git
  2. link to directory in terminal - 'cd bme680-python'
  3. Install using 'sudo python3 setup.py install'
  4. Enable I2C 'sudo raspi-config' (Interface options > I2C to Yes)
  5. Check sensor being detected 'i2cdetect -y 1' - BME688 should be in 77, if in 76 (which we found did not work with 'bme680-python' can cut the trace on the back of the board marked ADDR)
  6. Save lab-temp-humidity.py to folder and run 'python3 lab-temp-humidity.py' - data can be stored to a .txt using 'python3 lab-temp-humidity.py > txt file' and example of output included as 'sensor_output.txt'

Script Parameters

The sleep time can be changed between measurements, and the sensor is also capable of outputing pressure measurements as well.

BME Sensor Plotter

Requirements

  • Matplotlib
  • Numpy

Usage

The BME Sensor Plotter.py file can be launched using a text editor or just by double clicking the .py file.
This script will launch a command line interface, which allows the plotting of humidity data as generated by the lab-temp-humidity.py script.
2024-03-17 humiditydata.txt included in repository as an example data file

Modes

The interface will prompt the user to select a plotting mode:

  • Day
    • Lists all days for which data was found, and prompt user to select one
  • Daily
    • Plots the daily averages (RH & humidity) for each day
  • Hourly
    • Plots the average values for each hour from all available data
  • Continuous
    • Similar to Daily, but plots each data point instead of an average

Leaving the field blank and pressing enter will plot the last recorded day