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szbeni / forcegauge

Traning for climbing. Load cell with HX711 and real time plotting,
GNU General Public License v3.0
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Excitation voltage #1

Closed tomhaber closed 1 year ago

tomhaber commented 1 year ago

What kind of load cell are you using? Am I correct that since R20=20k and R21=8k2, the excitation voltage as well as AVDD will be 1.75V? What is the rated output of your load cell?

Thanks in advance

szbeni commented 1 year ago

Hi! EDITED.

The values are correct. I added the calculation to the schematic. The excitation voltage is about 4.3V. R20 = 20k R21 = 8k2 VBG=1.25V AVDD=VBG(R20+R21)/R20 =1.25 ((20000+8200)/8200) => 4.3V

szbeni commented 1 year ago

Updated the schematic with the calculation. The loadcells I am using: https://www.aliexpress.com/item/1005002046379393.html?spm=a2g0o.order_list.order_list_main.87.21ef1802pDKxhM

Rated output: 2mV/V So it would give 8.6mV at full scale with 4.3V excitation.