I have built a scale using two full bridge load cells, a HX711 amplifier and an Arduino mkr WAN 1300 with LoRa connectivity. I can upload the schematics if needed, of course.
At first, I powered the Arduino through the USB port, by connecting it directly to an electric socket, and the scale seemed to be working without problems.
I am now powering it with two AAA batteries connected to the green terminal. Data are still collected and sent via the LoRaWAN network, but now all readings are equal to zero and I have no idea why that might be. I have tried looking up similar issues, but I have not been able to find a solution. Does anyone have any suggestions as to how I can fix this problem?
It would be best to post a schematic, not a frizzy thing. I do not have a clue as to what the green terminal is, posting technical links that define the green terminal would be great. It sounds like a grounding problem but until I see a schematic of it as you have wired it I cannot be sure.
The sensors are connected to the ADC and the Arduino MKR WAN 1300 as shown in the figure on the left. And the I basically connected two batteries as shown in the figure on the right. Hope that helps.
