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Topic: Load Cell / Scale (Read 1 time) previous topic - next topic


Jul 17, 2013, 04:50 pm Last Edit: Jul 17, 2013, 05:21 pm by Steve Spence - KK4HFJ Reason: 1
Using a cheap postal scale ($15) and a instrumental amplifier, You can make a nice digital scale / load cell for automating other processes. Improvements welcomed!

Steve Spence - ET/AT/R&D KK4HFJ


Thanks a lot I might end up actually copying your work, but I'm currently working with a single strain gauge on a stainless steel 30cm ruler trying to build a scale, my in-amp is ad620an.
When I wire it all up all I see on the serial monitor is gibberish :(
I know I'm not offering much clues but I will keep track if you have any question to debug my problem.


I would prefer the INA series of OpAmp.
You might have to use the average of many samples. Normal scales are not very fast when displaying changes, I assume they also use some kind of average.


Check the High-precision 24-Bit AD module 1-differential ADC TM7709 Compatible 5V 3.3V
on ebay for a few $.
24 bit resolution ADC uses pin 11,12,13 on the uno for communication.
comes with small smd board that can be breadboarded or can be put in  small space.

Never to old to learn and I learn every day


When I wire it all up all I see on the serial monitor is gibberish :(

@Fido: The gibberish isn't caused by incorrect Serial speed, is it?

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