Hello,
I am trying to read data from a 4Kg load cell. I had given the excitation voltage to the load cell as 5V and its differential outputs are given to the ADS1255 IC directly on its analog input pins. I am able to successfully take the reading. The problem is after an hour or two sometimes or sometimes even after 15 to 30 mins the weight reading is shifted by 5-10 gms and I need to re-callibrate my readings accordingly. What I wanted to know is is this normal behavior of the load cell? Or is this an offset error generated by the ADC? What can I do to correct these errors? I know that load cell values are drifted by a value but the frequency of drift is very low I think (at least 1 or 2 days the values should be retained). I am attaching the schematic of my adc board. Please point out if any errors are present.