HX711 based Scale not showing values

While trying to set up a scale using the HX711 I am running into two issues. Either I have an error message that the wheatstone bridge isn’t functioning or I get no value

  • HX711 is not ready for new measurements yet!
  • Sensor just reads value 0

My setup following Load Cell Amplifier HX711 Breakout Hookup Guide - SparkFun Learn

  • HX711
  • Bar strain gauge
  • Espressif ESP32-WROM-32

Issue: HX711 is not ready for new measurements yet!
This seems to be caused by a loose connection. This is weird as it’s switching between the error message and showing value 0 from time to time withouth any change of the whole installation. Do you have an idea what could cause this?

Issue: sensors just reads value 0
I never get any weight out of this installation. I tried several GPIOs of the board and checked the connections. To me it seems like a hardware issue so I was checking the voltage.

The voltage is shown compared to GND of the ESP32

Element Voltage
E+ / red 4,73 V
E- / black 0,96 V
A- / white 2,85 V
A+ / green 2,85 V

When comparing the A- and A+, I see a very small change in voltage of 0.9 mV.

The ESPHome program contains these lines

  - platform: hx711
    name: "Katzengewicht"
    dout_pin: GPIO25
    clk_pin: GPIO26
    gain: 128
    update_interval: 5s