This python module is meant to enable a raspberry pi to acquire data from up to 16 SHT21 sensors connected over i2c. It comes with a sytemd timer that runs every 10 seconds once started and the data can either be stored on disk or sent to an influxdb.

nclib (pip install nclib) i2c-tools (sudo apt-get install i2c-tools)

git clone https://github.com/kuchosauronad0/sht21pi.git
cd sht21pi
sudo python setup.py install

sudo make install # this creates directories and copies the systemd unit + timer

You can run the module with python -m sht21pi.core -c /etc/sht21pi/sht21pi.conf OR activate and enable the systemd unit so that it is started after reboot with sudo systemctl start sht21pi; sudo systemctl enable sht21pi

# detect devices:
sudo i2cdetect -y 0
sudo i2cdetect -y 1
# run the unittest:
python -m unittest sht21pi.core

less /var/log/sht21pi/sht21-application.log

Fix: raspi-config point 5 "Interfacing options" enable SPI (for the leds) and I2C (for the sensors)

apt-get install python-smbus

/boot/config.txt is missing 'dtparam=i2c_vc=on'

nclib for communicating with the database (pip install nclib)