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Update: current on L2 (Phase 2)
02/24/2020 at 13:08 • 0 commentsThe current meter is sensitive enough to detect the current rise of my 3D-printer's bed heater:
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a new case and a lesson that I should spend more time on slicer settings
01/03/2020 at 07:03 • 1 commentI 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.
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field test
12/31/2019 at 18:07 • 0 commentsNow 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)...
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assembly and first test
12/31/2019 at 00:26 • 0 commentsI 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/