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