I have a small script running that reeds 4 separate load cells and transmits them with BLE. All good, as long as it’s connected to USB power.
As soon as I disconnect USB power, the BLE is still visible, but it seems to not read the load-cells anymore.
I use Sparkfun HX711-boards (SparkFun Load Cell Amplifier - HX711 - SEN-13879 - SparkFun Electronics) and have them connected to 5V (VCC) and 3v3 (VDD).
My sketch is so simple it doesn’t even make sense to post it. What could be wrong?