10kg Load Cell (TAL220) with Hx.711 gives reading of 0 all the time

Using Arduino Sensors
1

Greetings,
I am undergoing a project that involves the use of a load cell to detect the presence of weight on top of a plate (E.g. when something is placed on it)

Here is my problem: I always get a reading of 0 regardless of what is on the load cell. There are some occasional fluctuations (random values) popping out but most of the time it stays 0.

I've included my code here:

#include "HX711.h"
HX711 scale(A1, A0); // DOUT, SCK


void setup()
{
  Serial.begin(9600);
  scale.set_scale(2280.f); 
  scale.tare();
}

void loop()
{
  Serial.print("one reading: ");
  Serial.println(scale.get_units(), 1);
}

And this is my setup:

973×603 401 KB

Things I've tried:

  • Reinstalling the library
  • Switching Arduino boards
  • Switching load cells
  • Checking the wiring multiple times

Can anyone take a look and provide me with some guidance? Your advice is much appreciated.

2

Your code: HX711 scale(A1, A0); // DOUT, SCK

But your image shows DOUT, SCK going to digital pins 2 and 3.

:confused:

3

DaveEvans:
Your code: HX711 scale(A1, A0); // DOUT, SCK

But your image shows DOUT, SCK going to digital pins 2 and 3.

:confused:

Thanks for spotting that - I switched the pins to their respective places (A1, A0)
This time, the value changes from zero to 8388607, and it stays at that exact value no matter what I did to it (Adding weight, decreasing weight...).

4

The value u read 0x7fffff means 'no load'.
Do you read the correct input (A)?
Check connections and code

5

It seems unlikely that YOUR calibration factor is the same as the factor in the example (2280.f).

Have you calibrated the scale in accordance with the library instructions?

6