A self-contained PCB-based weighing scale

Check out PCBWay's website for rapid prototyping of printed circuit boards, CNC and 3D printing services and many more! https://www.pcbway.com/setinvite.aspx?inviteid=482140 If you have a nice PCB design, make sure that you register for their contest! https://www.pcbway.com/activity/5th-pcb-design-contest.html 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. Join my channel membership: https://www.youtube.com/channel/UCKp1MzuAceJnDqAvsZl_46g/join 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! Affiliate links: ATTiny85 microcontroller: https://s.click.aliexpress.com/e/_ADV8q7 350 Ohm strain gauges: https://s.click.aliexpress.com/e/_DD7tCd5 HX711 module: https://s.click.aliexpress.com/e/_DkbdDgn OLED display: https://s.click.aliexpress.com/e/_DcZ7cf5 For more information, check my website: https://curiousscientist.tech/blog/pcb-weighing-scale-ver2 Buy the board directly from PCBWay: https://www.pcbway.com/project/shareproject/Self_contained_PCB_weighing_scale_95a0abd4.html If you want to support my work, please consider buying the parts using my affiliate links: https://curiousscientist.tech/tools