Currently, I am trying to read a load cell using an HX711. There are plenty of tutorials online to view and they've all been helpful for the smaller load cell that I was using to test but once I switched it over to the bigger load cell it didn't output any data. I believe it is because the load cell used is only being loaded for roughly 9ms and the HX711 doesn't have the sampling speed to keep up. I was curious if anyone ran into a similar issue or knew a work around. Thank you!
Have You used the proper resistors in the bridge amplifier?
The HX711, as I get it, is not sampling. It only amplifies and outputs the result instantly. It's up to the controller reading it to be fast enough.
How would the HX711 remember any value? For how long would that be? It would be considered as an unwanted delay.
That might be my issue. Any suggestions on what to use for that? It is a 20k Kip load cell and I am trying to replace the current system used for reading it.
This is what I found online which doesn't give me a high enough sampling rate but I might be understanding it wrong.
Yep, default 10Hz measuring time is at least 100ms, and it could have just started a measurement,
so you could be waiting 200ms for a result. Same for the 80Hz setting (25ms).
Time to look for a different chip.
Leo..
Do you have any recommendations on chips to use?
Could you possibly provide a link to the device you intend to use?
This circuit will amplify the signal from a bridge arrangement, but without the specs for your device ...
I see the AD7705 pop up in a Google search.
Know nothing about it.
Leo..
The data sheet says its for "low frequency applications" but I cant see any more detail
p24 talks about 60Hz.
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7705_7706.pdf
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