powermeter

A simple Pyhton script to mesaure you electricity consumption using the LED on a electricity meter and a digital light sensor.

You either can use InfluxDB to store the data or a built in Flask application.

Hardware setup

• Raspberry Pi
• Digital light sensor like this: https://www.berrybase.de/lichtsensor-mit-digitalem-ausgang

Connect the light sensor to your Pi:

VCC: 5V
DATA: GPIO 27
GND: GND

Software setup

• Copy the .env.example to /etc/powermeter-environment and change it to your needs.
• Acivate at least InfluxDB (which I would recommend) or Flask output.

Clone this repository, configure .env file, setup systemd service:

git clone https://code.f2n.me/finn/powermeter.git
cd powermeter
cp .env.example /etc/powermeter-environment
cp powermeter.service /etc/systemd/system/powermeter.service
systemctl enable powermeter
systemctl start powermeter

For Flask app also to the following steps:

virtualenv .
pip install -r requirements.txt
cp apache2_sample_config.conf /etc/apache2/sites-available/powermeter.conf # modifiy to fit your needs
a2ensite powermeter
systemctl reload apache2

Developing (Flask app)

For developing run this (you need to create database and user first):

export FLASK_ENV=development
export APP_DEVELOPMENT_DATABASE_URI=postgres://username:passwort@hostname/database
flask run

Future thoughts

• build container for flask app
• Microcontroller edition
• and more

Screenshots

Node-RED usage example:

Grafana Dashboard example (InfluxDB datasource):