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August 5, 2019
Tutorial - Load Cell Amplifier HX711 Breakout Hookup Guide
about 4 months ago
Hello everyone - I'm new to the site and don't very often make comments however I would like to leave a few words about the HX711.
I purchased several of the "made in china GREEN BOARD HX711" and had many problems.
First problem was that the HX711 would try to reset during its communication cycle when it should not be and this was giving erroneous readings during this reset.
Second was the Mv output was changing even when weight was setting still? "oh yea - had one of those china made load cells"
Third was reference voltage out to the load cell was only at 1.80 VDC giving me less then normal resolution.
Forth was putting the same weight on and removing then placing back on would give me a completely different reading "not repeatable"
And many more unknow problems which could not be identified.
So I have purchased the Sparkfun Load Cell Amplifier and this board is a world of difference, in other words "WORKS PERFECT"
This board is repeatable, accurate, steady, no false resets, And I like the separate voltage input to the load cell this gives me a full 5 VDC to the load cell for better resolution.
I would like to THANK YOU SPARKFUN for making such a great board.
Also for those who need a accurate steady reading do your research of the load cells they have a C1 thru C6 rating for accuracy and repeatability and also look for ones that are temperature compensating " I'm using a C3 legal trade rated with temp. comp."
And to those who are trying to build a reliable scale - First buy a HX711 from Sparkfun and a good load cell and you will eliminate most of the problems I've went thru.
Anyway - enjoy building and stay away from "made in china" - I like to troubleshoot my own errors not someone else's design problems.
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