Firmwares for load cell adjustment
Introduction
There are adjustment sketches for two different precision analog-to-digital converters (ADC), acting as a frontend for bridge sensors commonly used in industrial load cell components:
scale-adjust-ads1231.ino for ADS1231 from Texas Instruments
scale-adjust-hx711.ino for HX711 from Avia Semiconductor
Instructions
When working with the load cell, individual parameters have to be defined. To get hold of the appropriate values, you have to measure them to adjust the raw sensor readings properly.
These values are not type specific! Even load cells of the same type/model have individual characteristics, so you have to determine both per load cell.
The sketches listed above can help to discover these two values:
ZeroOffsetis the raw sensor value for zero balance, 0 kg.
KgDivideris the raw sensor value for a load of 1 kg.
Please follow the instructions in the respective source code sketch…
Tip
On some load cells, the range around 0 kg gives negative raw value readings, so we try to start for the 1 kg (or whatever weight you may choose) on a higher range.
Appendix
If you’re still reading, you might want to have a look at these fine papers:
Load cell Primer by Phidgets, Inc.
How to use load cells from A&D
Load cell and weight module handbook by Rice Lake Weighing Systems