Hi everyone
Recently I bought a scale with 200 kg load Cell , this scale is a commercial one that is usually connected to a cheap commercial 7 segment display , but I bought only the scale part with the load cell only
here a photo of the unit
its load cell has the ordinary 4 wires red black white and green,
and I connected them to HX711 breakout board which I connected to an Arduino Nano as you can see here
#include "HX711.h"
// HX711 circuit wiring
#define LOADCELL_DOUT_PIN 3
#define LOADCELL_SCK_PIN 2
HX711 scale;
void setup() {
Serial.begin(57600);
scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
}
void loop() {
if (scale.is_ready()) {
scale.set_scale();
Serial.println("Tare... remove any weights from the scale.");
delay(50);
scale.tare();
Serial.println("Tare done...");
Serial.print("Place a known weight on the scale...");
delay(5000);
long reading = scale.get_units(10);
Serial.print("Result: ");
Serial.println(reading);
}
else {
Serial.println("HX711 not found.");
}
delay(1000);
}
the problem I'm facing now is that the reading from the scale is always 0 with no difference if a load is mounted on the scale or not
I used the same HX711 with another load cell and It seems working and the scale itself gave accurate reading when it was connected to the original 7 segment display
I'm not really sure what is the problem ?
There is related discussion in @drmina2023's other topic on the project:
@drmina2023,l it is OK to make separate forum topics for well defined discrete aspects of a project. However, there are some requirements for this to be done in a manner compliant with the rules of the forum and respectful of the people offering free help:
Avoid convergence
Even when the topics start out on discrete subjects, they have a tendency to converge to parallel discussion over time. Parallel discussions are harmful because they waste the time of the helpers who unknowingly duplicate the previous efforts from the other topic. For this reason, you must manage the scope of the discussion to prevent this from happening. If discussion starts to stray into the territory of the other topic, then redirect the participants over to the other to continue that discussion.
Cross-reference
The readers of one topic won't necessarily be aware of the content in the other. If information in one topic is relevant to the discussion in another, help your helpers by mentioning it there with a link.
So far, you created three different topics about this project, caused overlap between each of them, and didn't mention the previous discussion. Do better in the future.
@Railroader
here is the schematic
Notice that my HX711 has a yellow pin that is free as my load cell has only 4 wires red black white and green all are soldered to the corresponding pins on the HX711.
Compare with a DMM the resistances across the wire pairs on the good and suspect faulty load cell.
Do this with the cells not connected to the 711 module.
@Koepel
here are the resistances of the current load cell as I measured them before
red - black 0.294
red - white 0.291
red - green 0.356
black-red 0.289
black-green 0.289
black-white 0.405
green-black 0.289
green-red 0.352
green-white 0.289
white-black 0.402
white-red 0.289
white-green 0.289
Thanks, there is resistance in the wires, but it almost seems that the wire colors are not standard.
Normal load cells that are use by the HX711 have a resistance of 1kΩ. The load cells of your scale might not be compatible with the HX711.
I suppose that those values are Ohms, not kilo-Ohms.
And yet you just did it again. I'm giving you a short forum suspension since it seems that asking nicely isn't getting your attention. On your return to the forum I hope you will be more respectful of our community.