I am a student and for my school group project I will build a power consumption monitoring device that will be connected electrical panel/fuse box.
So I will have a sensor measuring current/amps of the main wire (around 100A max input/ 100 mA input) in the electrical panel. The sensor is connected to a circuit which has microcontroller on it. Then, in the end I will make a mobile app which will display the measurement as waveform for each appliance.
My problem is on how and what circuit should I build that will able to identify the appliance and its corresponding waveform. I arrived at my solution that is to identify the appliance and its current signal by the differentiating its frequencies. Since every appliance has same frequency of 60 Hz, I will use the noise of the current signal instead.
I think I have to build a high pass filter to reject the 60 Hz and so the noise only remains. Then, I will also need several thin bandpass filters in the high frequencies so I will know what frequency components the noise has. For instance, if a dryer has noise frequencies of 2 kHz, 8kHz and 10kHz (values not real!), then I got those values with my bandpass filter, then I will know that it is a dryer. My problem is I do not know how to build this and what do I need? Help! Also, this is my very first circuit that I will build and have little to no knowledge about filters so take it easy on me.
So I will have a sensor measuring current/amps of the main wire (around 100A max input/ 100 mA input) in the electrical panel. The sensor is connected to a circuit which has microcontroller on it. Then, in the end I will make a mobile app which will display the measurement as waveform for each appliance.
My problem is on how and what circuit should I build that will able to identify the appliance and its corresponding waveform. I arrived at my solution that is to identify the appliance and its current signal by the differentiating its frequencies. Since every appliance has same frequency of 60 Hz, I will use the noise of the current signal instead.
I think I have to build a high pass filter to reject the 60 Hz and so the noise only remains. Then, I will also need several thin bandpass filters in the high frequencies so I will know what frequency components the noise has. For instance, if a dryer has noise frequencies of 2 kHz, 8kHz and 10kHz (values not real!), then I got those values with my bandpass filter, then I will know that it is a dryer. My problem is I do not know how to build this and what do I need? Help! Also, this is my very first circuit that I will build and have little to no knowledge about filters so take it easy on me.