Trenton

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font formatting in RECEIVER CODE section Trenton Sunday, December 14, 2014 - 9:31pm Sunday, December 14, 2014 - 10:09pm 1

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Thanks Louis. Typical weight range for my project about 500 to 1,500 lbs. I sourced an amplifier chip specially made for load cells, but I found good load cells were expensive - so much so that a scales built with load cells would not be much cheaper than just buying cattle scales. Hydraulics and pressure transducers were much less expensive.

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JPL, first of all it is gratifying to me that you actually built the device from my instructions. Regarding your question, I also found the scale does not hold absolutely on 0, but I assumed it was the error inherent in the pressure transducers I used. I think my pressure transducers are 500 psi 1% FS error where maybe I should have used 300 psi to reduce the error. In actual practice by weighing cattle and then seeing the official weight at the sale barn I believe my device is accurate to about 7 lbs, but the weights on my ticket at the sale always are multiples of 5.

I don't think I've had the problem with shifting weight, but you can adjust the ratio in the function if you like. I seem to recall in course of design and testing I felt like I did revise it toward a more permissive ratio, but I suppose you could take it further based on experience.