Load cell calibration doesn't work correctly

Sensors Force & Weight
1

Hi,

I’m using an Arduino Uno R3, a Sparkfun HX711 and the Phidgets load cell 5 kg. Because I’m new to this stuff, I thought it’s the easiest to start with the SparkFun Codes https://learn.sparkfun.com/tutorials/lo … -guide/all

My issue right now is that my determined calibration factor only works for the weight I calibrated with. As soon as I place other weights on my load cell it shows wrong weights.

I’m not sure where the issue is, whether it’s the hardware or the code!

What do you think?

Thanks!

2

Double check how you have the load cell setup physically, the calibration weight and whatever you’re wanting to weigh later on must be in the exact same location on the load cell for it to produce accurate results.

3

I’m not using a plate, I place my weights on the load cell directly. I think they are in the same spot. Do you think it makes that much difference when the spot is not exactly the same?

4

Are the incorrect weights all lower than expected?

Do you have a little spacer under the mounting point on the dead end of the cell?

5

brow:
Are the incorrect weights all lower than expected?

Do you have a little spacer under the mounting point on the dead end of the cell?

Yes I had one, but the the incorrect weight were lower than expected. But it is better with my final setup.

6

The user Yellowdog had a good post about another product that might be helpful in your case, you can see it in the link below. Give that physical setup a try, that should resolve your issues.

viewtopic.php?f=79&t=55980&p=227067#p227067

7

Hi Debora,

Did you resolve your load cell calibration issues? If not, I may have some useful info from my own recent experimentation with similar.

Also, did you establish a “tare” point as well, to zero the thing - to be used in conjunction with your scale factor?

All the best!

Mark

8

microarduino7:
Hi Debora,

Did you resolve your load cell calibration issues? If not, I may have some useful info from my own recent experimentation with similar.

Also, did you establish a “tare” point as well, to zero the thing - to be used in conjunction with your scale factor?

All the best!

Mark

Hi,

yes I did! The issue was my setup :slight_smile: Thank you!