Arduino for STM32

Hi all,

I am french, Sory for my English.

I work on a beehives electronic scale with HX711 for my 4 beehives. the datas are sending to my home with radio "ZETA865" modules. I use STM32F411-Blackpill , and a HX711 with 4 load cells. The schematic is standard see picture. I have wired 4 systems "4 load cells systems" with this schematic except for the electronic that is à STM32F411 - Black pill.




With 2 of " 4 load cells system" , the result is ok and i can mesure my body weight. the value of the output HX711 at 0kg = Tare is equal to "380 000" .

With the 2 others "4 load cells system", the result is bad. The value of the output HX711 without weight is equal to "66 380 000" = 712kg !! .

With my body weight the output value is decreasing at "9543290" . the différence = -57092680 .

I have verified. I don't find wiring difference between good "4 load cells system" and bad "4 load cells system". How is possible that value of the output is decreasing on the 2 bad "4 load cells system" ?

Thanks for your answers.

Joël

Are you running a common ground?