ShangHJ 2 Sets Digital Load Cell Weight Sensor + HX711 ADC Module Weighing Sensor for Arduino DIY Portable Electronic Kitchen Scale Kit (10kg, HX711)

Nice weight measure (this one is the lowest cost I could find). Simple soldering to attach the headers to the electronics board, instructions in the Amazon product help match the wires, I crimped on some dupont connectors I had laying around for easy on/off, then I 3d printed a small base to easily attach a M4 screw at one end, and allow the other end with the arrow sticker to be free floating so the weight can measure. Was easy to find an Arduino library to read, calibrate, and tare the value.Cannot wait to build this into a robot weight measuring device for my robot club. We use a commercial one right now, but a DIY project fits our club way better than a store bought solution.

The load cells work to 20kg, and are relatively linear. My only complaint is the circuit board that came with it. It has good resolution (24 bits) and good gain, but the sample rate is fixed at 100ms. The chip is even capable of higher than that (12.5ms) but the PCB design has hard-wired it to be locked at the slower rate for some reason.

When I connected the two sensors and started taking measurements I noticed that one had much greater measurement noise than the other. Ex: one might read 500 +/- 10 on average while the other was reading +/- 10000 or more. I wanted to use the two of them together to make a larger scale, but the excess noise would hurt the accuracy.

I bought these in anticipation of using them for a project, to which I am now getting. I need to build my platform, but have been working with the HX711 boards and a Python library that I found on line. Since I have not formally mounted these, I cannot speak a great deal to their accuracy, but a note of caution - if you find a library online and there are comments - read ALL of the comments, I discovered the article had errors and the author has done nothing to correct them.Use the wiring scheme presented here on Amazon.Use one cell per HX711 since channel B does not have the same options as channel A.I found the HX711 works with 3.3 volts (RPi) as well as 5 volts (also RPi, but the GPIO's are rated at 3.3 volts and will burn out at 5 volts, but I tried 5 volts and my RPi is working, but went to 3.3 volts)The HX711 mounting holes are around 2.6mm, definitely less than 3 mm (M3), Amazon has screw kits for M2.x screws, watch for the flat head v pan/hex/etc - the flat head could split your board if you get it too tight.

Made a scale with one of these and a raspberry pi, pretty accurate.

Rate is NOT selectable as stated in the description. It only samples at 10SPS and there is no way to change it to 80SPS. Seller sent me to a GitHub page as an answer to this question but there is no info on rate in the github link.

Works well and is pretty accurate across the range. Easy to setup and use with Arduino.

The wire is very thin and easy to break, otherwise, it works

The analog and digital grounds are separated with no connection from analog ground to input ground