FootTea
Member level 1
My friend is building an energy monitoring for single phase AC. I only helped him in soldering but I do have some knowledge in electronics and arduino. I have soldered already 10 boards (assuming it has been tested already which I later found out was not). For this case, we will be using Tiva. I can follow his algorithm and PCB circuit but I didn't have actual experience using Tiva.
I can trace what I have soldered and this is what I assumed to be the voltage transformer part of the wattmeter. This is just a transformer to step down the voltage and some signal conditioning circuit to so that we will be in range of Tiva input by offsetting the negative half cycle to Tiva's 0 voltage.
Transformer used is this one https://docs-emea.rs-online.com/webdocs/15c2/0900766b815c22e1.pdf .
When it was finished, it has to be tested. When it was tested, output waveform Tiva has fetched looked something like this:
The red part is interesting because I don't have an idea what could have caused it. It is a sine wave with a clipped square wave like shape on the positive half cycle. I don't have the exact fetched values since he was the only one showing to us the output and I don't want him to feel bad if ever something was wrongly done (either from design or soldering part).
I can trace what I have soldered and this is what I assumed to be the voltage transformer part of the wattmeter. This is just a transformer to step down the voltage and some signal conditioning circuit to so that we will be in range of Tiva input by offsetting the negative half cycle to Tiva's 0 voltage.
Transformer used is this one https://docs-emea.rs-online.com/webdocs/15c2/0900766b815c22e1.pdf .
When it was finished, it has to be tested. When it was tested, output waveform Tiva has fetched looked something like this:
The red part is interesting because I don't have an idea what could have caused it. It is a sine wave with a clipped square wave like shape on the positive half cycle. I don't have the exact fetched values since he was the only one showing to us the output and I don't want him to feel bad if ever something was wrongly done (either from design or soldering part).
