a simple approach to home energy monitoring (with smart home integration)
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The goal of this project is not to measure the exact amount of energy being consumed. So I pass on measuring the voltage of each phase and calculating the exact cos phi (power factor). Instead, I set the voltage to 230V and the cos phi to 0.9.
So far it works better than expected. It is easily possible to identify individual appliances:
See project logs for more details...
The current meter is sensitive enough to detect the current rise of my 3D-printer's bed heater:
I designed and printed a new case...
...with mount brackets for the DIN-rail and some ventilation grilles.
It came out useable but some details got lost. (4h @0.32mm layer height with an 0.4mm nozzle)
In the future, I should set the focus on print quality instead of short print times.
Now it's time for the first field test. I assembled the 3d-printed case (with some tape) and installed the current transformers in my mains input. (Fortunately, there were 4 free wires on a cat cable that brings DSL to my modem/router)
After that, I was able to check the values transmitted to the smart home with a clamp amp meter.
-> field test passed -> design and 3d print a better case (with DIN-rail mounting brackets)...
I soldered the three analog to digital converter on a perfboard and connected it to 5V, GND and the I2C interface. After that, I added three 3,5mm jack sockets (which I harvested from an old PCI sound card). The three jack sockets are connected with the A0 input of the ADCs.
For the first test, I connected a test load and a reference measuring device through all three current transformers.
All three inputs (later used for L1, L2, L3) showed nearly the same value and an acceptable deviation to the reference energy meter. -> first test passed -> design and 3d print a simple case...
You must be very cautious and work safely with mains voltage!
See this great article about working safely:
https://hackaday.com/2016/05/11/looking-mains-voltage-in-the-eye-and-surviving-part-1/
I will post the source code as soon I am able to find the file in my NAS. Unfortunately, my backup routines were not very good when creating this project.
I'm sorry I can't see the code. I'll wait for the code to come out one day. and our team and I are looking forward to your next project. Thank you for the using WIZnet product
I will post the source code ( here ) as soon I am able to find the file in my NAS. Unfortunately, my backup routines were not very good when creating this project.
stefan.schnitzer
M. Bindhammer
David Scholten
Dominik Meffert
Quinn
This is Scarlet from WIZnet team. We are developing various Ethernet solutions.
could you share this project code to everyone? It so great project, so it will be help to many people.
If you have any questions or inquiries when you sre using Wiznet Ethernet solutions, please contact us at the email below. (maker@wiznet.io)