Read data from your electricity meter
Most modern electricity meters or smart meters (often on the digital display to detect) have an IR interface via which you can read the current consumption and other data. The data is read out with the help of an IR read head.
Unfortunately, I was not able to read this USB / Serial port with java. So i could not develop a binding for it. In various forums i read that the driver chip used here is especially problematic. If someone knows more about this topic, feel free to contact me.
With a shell script the reading works. It now runs as a cron job and transmits the data via REST API to openHAB.
Use of the data
With the consumption data from the previous year, you can also create a projection for the current year. For this purpose, the consumption of the current year is taken plus the consumption of the previous year from the remaining period.
All scripts for reading the electricity meter as well as the openHAB rules for generating the extrapolation are part of my Deployment Projektes or downloaded. Alternatively, the openHAB rules can also be obtained directly from my Github Repository.