Interface with the Adafruit DHT sensor and log values to a database. Runs on my Raspberry Pi3 with an adafruit DHT-22 sensor.
These are run from the pi by editing the rc.local file and adding the lines:
sudo nano /etc/rc.local
python3 temp.py &
telegraf --config temperatureLog.conf &
This runs the above commands at start up so the pi only needs to be plugged in and will automatically start logging values and pushing them to a remote database. The temperatureLog.conf file runs Telegraf which has been configured to push these values to an InfluxDB.
I wanted to periodically truncate the log file so it doesn't become too big and eat up memory. First I needed to change ownership of the temperature.log file that is created with the above python process so it can be modified by non-root.
chown <user> -R temperature.log
Then I set up a cronjob to truncate the file daily by running the truncate.sh file.
I added an LED display screen to see the current temperature to create a more interactice display. The temp.py script was altered to also update the LED screen with the most recent temp reading. This updates every 30 seconds.
I used these displays and they have worked great. I use the i2c_driver to interface with the screen as tutorialed here. The copy of i2c_driver.py in this repo does have some changes to better allow for toggling the backlight screen.