OK, I understand it's necessary to post an image about that (I've done with KiCad if you tell me a better tool I really appreciate that)
With a 3.3v microcontroller, you should use an HX711 (like SparkFun's...link below) that can use different VCC (5v) and VDD (3.3v).
I'm using ESP32 LilyGo-T-Call-SIM800 that it has on pin 16 a 5v output. It should be fine, Is it right?
The voltage between E- and ground should be zero, with and without the strain gauges. Since you measured a bit less than 5v, you may have a defective HX711.
I've measured more times and it's not always 5v (without the strain gauges) sometimes it's 0v. So I guess HX711 could be defective.
The voltage between E+ and ground should be about 4.3v, with and without the gauges, not "a bit less than 5v." You may have a defective unit.
I measured again and it's 4.94v without the gauges.
With the strain gauges properly wired, A+ and A- should be about half of 4.3v under no load.
I measured 0v.
Some (green) HX711 boards have have no ground plane,
Yes, I have a green HX711.
Do you want to form a Wheatstone bridge from 4 strain gauges?
Yes, I want to form a Wheatsone bridge with 4 strain gauges. Unfortunately, I can't read the value even if I am supposed to have linked it all correctly.
That would never give absolute weight.
What does it mean? I don't understand with "absolute weight".
In the end, I guess my HX711 could be defective and I have not a wiring issue. Are you agree with me? If that is correct I'll buy sparkfun controller as suggested by @DaveEvans