Wheatstone Shield & LCD - Arduino Question

Help & Support Robot Parts
1

I have 5 kg load cell, Wheatstone Shield, & LCD - Arduino setup.
robotshop.com/blog/en/arduin … -lcd-17078

I have gotten everything to work but it seems that when I remove power from the Arduino I have to re-calibrate the system.

I must be missing something very basic here :wink:

Any help would be greatly appreciated.
Thanks
Phil

2

Hi Phil,

Please note that the calibration of the system is inherently tied to the stability of the ADC, which is directly linked to the power source(s) used and other noise in the power supply system (such as DC motors or other loads that vary and other signal noise, such as switching circuits).

Therefore, changing power sources (ex: from a USB cable to a AC>DC adapter or a battery pack) will force a re-calibration of the system, since the ADC will (most likely) be affected by such a power supply change.

This means you should always perform a calibration with the system powered how it will be used to get proper values.

We hope this helps.

Sincerely,

3

Thanks for the speedy reply.
Makes perfect sense.
I was hoping to not have to scroll between the default “Set high force” value of 1000 and my desired value of 8570 and then I looked at the sketch and found the default “Set high force” value and changed it to my desired value and made my life a lot simpler. :wink: