A self-contained PCB-based weighing scale
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In this video, I reiterate my previous attempt at building a PCB-based weighing scale. After learning from the conclusions of the previous project, I designed a PCB which also acts as a weighing scale. The whole PCB is "self-contained" which means that there are no other external parts needed to operate the scale. The circuit has a LiPo battery as a power source, an ATtiny85 microcontroller, an HX711 AD converter and an OLED display as well.
I met some obstacles during building the first circuit, but at the end of the process, I could make everything work and function properly.
Update: I kept working on the reason for the drifting. The circuit works just fine, but it turned out that the strain gauges I used in the Wheatstone bridge are rubbish. I built a standalone bridge using 4 strain gauges of the same kind and I ran them with an HX711 module and the bridge was drifting and fluctuating a lot. Then, I disconnected the strain gauges from the PCB I showed in the video and attached a load cell to it. There was no drifting or large fluctuations!
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