Hi, I'm experimenting in making an outdoor scale that it will be consistently under load 24/7 365 days. For my testing purposes, I used 4 Load Cells of 25Kg each connected in a Wheatstone bridge configuration, using an HX711 amplifier.I proceed with some indoor testing which i got pretty good results. The problem starts when i moved the scale outside putting a known metal object weighting exactly 12.5Kg. During the morning at a temperature of 15° Celsius i get pretty much accurate readings. As the sun rises the readings adds up weight. At 20° I get readings of 13.4Kg until the night that gets to the exact 12.5 Kg reading again. My guess is that temperature messes with the resistance and so the readings but my question is that if this is normal getting about 1kg deviation on 5° and what do you suggest me to do to compensate the difference? Should I add a temperature sensor to adjust the readings accordingly? If I finally switch to 1 load cell of 200kg will I have the same problem? I'm not chasing gram precision but i think 1 kg for 5° will get way off on summer which will be a problem! Thanks in advance for any Help.!
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Temperature, angle, and adhesive effect strain gauges.
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