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While working on this project, I observed some things with my bench power supply, my st link, and my usart to ttl converter. The bench power supply i am using needs to be changed, the display may be showing 14v but when I measure the voltage at the connected wire, I get around 13v and also it does shock a little occasionally. Then for my st link when it’s connected to my laptop and connected to the board, I’m working on, when I send data from my board via usart to ttl converter to my laptop, the majority of the data is garbage, but once I remove the st link from my laptop, the data is readable and accurate. I decided to power the board directly with a battery, and all the issues above disappeared. I think the power supply has worked its money. Can anyone suggest a good affordable power supply for me, please?
I have finally fixed the issue as to why I could not get a current reading from my ac appliances. There was supposed to be a pull up resistor used to pull up my non-inverting pin of my op amp to 3.3v. I used a smaller value of 5.1k instead of the 22k then I also failed to multiply my value by my op amp gain on my firmware. I fixed it and I am finally able to measure my current, next thing to do is to fine tune it, to get a more accurate value. I had to use another board to try and figure out where the issue was coming from
0VID_20250424_072128.mp4
False alarm 😤😤. I tested the current measurement with Grid supply and everything worked well. So I then decided to assemble the board completely and power the high frequency inverter. And it’s back to the drawing board. The system does not measure the current once the inverter is working. I don’t know if it has to do with noise or something, without load I am seeing about 8amps AC. From where? I do not know, I intend to use a separate op amp to measure the current and see if that’s the problem, check out the two videos. It is going to be a long weekend .At this rate my head may fall out😮💨 😤
VID_20250426_173004.mp4VID_20250426_173054.mp4
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