Hx711 better library and code

Projects Programming
1

Hello,im using the library hx711.h master (04/12/2021)
and my code for getting weight

weight = scale.get_units(), 3;

is there any code or library that can cut off some extreme values showing sometimes?

2

How about ignoring extreme, illogical values?

I would guess that sometimes occurring extreme values
are caused by environment, hardware, setup, or wiring.

3

Considering that this code will always assign 3 to the weight, it doesn't seem too extreme.

1 Like
4

How can i ignore this values?

5 
  if (valueIsNotExtreme) {
    // use value
  }
6

Number 3 is the number of decades,eg 1.001, some times there are suddenly values like 9.000 with no weight on.On the same board there is a gsm 900 modem

7

Thank you for your answer,but extreme readings are not predefined, its a weight scale and weight is not known before

8

So your question does not really make sense,
if you can not define what the above extreme means.

9

Perhaps not in the code you posted:

It could end up acting like a Comma Operator.

10

This is actually working after comma if i put 2 i have two decades eg. 1.00

11

Not in the minimum of code you posted.

The , 3 is simply ignored.

struct Dummy {
  float get_units() {
    return 2.34;
  }
} scale;

void setup() {
  Serial.begin(115200);
  float weight;
  weight = scale.get_units(), 3;
  Serial.print(F("float weight = "));
  Serial.println(weight);
}
void loop() {}

float weight = 2.34

Somewhere\KommaOperator\KommaOperator.ino: In function 'void setup()':
Somewhere\KommaOperator\KommaOperator.ino:10:32: warning: right operand of comma operator has no effect [-Wunused-value]
   weight = scale.get_units(), 3;
                                ^
1 Like
12

Im using library hx711.h

13

That does not matter.

1 Like
14

IMG_20230518_231307
IMG_20230518_231307720×347 49.4 KB

This is the sms i receive first and second line are for weight

15

I give up.

Good luck with your project.

2 Likes
16

That raises questions about powering the board.
A GSM modum could draw up to 2Amp during transmit.

Serial.println(weight ,3); // print with three decimal places

Leo..

17

Hi,
Can you please post your complete code?

Have you tried the example code that comes with the library, to prove that your hardware communication is stable?

Can we please have a circuit diagram?
An image of a hand drawn schematic will be fine, include ALL power supplies, component names and pin labels.

How are you powering your project?

Thanks.. Tom.. :grinning: :+1: :coffee: :australia:

18

You are mistaken. Your code can't works this way.
The syntax like (x, 3) actually works in the print() operator ONLY, but not anywhere in the C code.

Please show whole code.

19

powering the board was one of my first problems...it is solved, 18650 battery and volage booster at 5.2v,

you are right about
Serial.println(weight ,3); // print with three decimal places
this is what im using on sending sms.

is there a way that i can take eg. 10 readings and delete the one that is way a lot above other nine?

weight = scale.get_units(10);

20

you are right about
Serial.println(weight ,3); // print with three decimal places
this is what im using on sending sms.