Hello everyone!
I started working on home automation a few months ago.
To do so, I am currently using “MySensors” (an open source home automation protocol) and “HomeAssistant”.
The sensors I build are based on ATMEGA328P microcontrollers and RFM69W radios.
Willing to follow my power consumption, I found the OpenEnergyMonitor project which really looks good!
I plan to build an energy monitor with a CT current sensor and an AC / AC adapter to measure the voltage.
The CT sensor I will be using is the “YHDC SCT-013-000”. I will use the right burden resistor so that the ATMEGA328P can measure a current up to 100A.
I have an “issue” though: I’m not very happy about the resolution I will get with such a setup
Indeed, I live in France and it is common here to have electric radiators / water heaters.
As a result, our power consumption is “not that high” during summer but can be very high during winter.
I have been searching for ways to make the measured current more precise and I found by chance that old “forgotten” blog post which seems to be exactly what I want: High Accuracy Current Measurement Over a Wide Range - Blog | OpenEnergyMonitor
I haven’t found any reference to that article in the documentation / forum posts (via Google) which surprised me.
My questions are:
- Has any of you done this kind of setup?
- Why has the idea been abandoned / not mentioned in the “learn” documentation?
Cheers!