Library HX711

[vejo17]

Hi Good night i have problem with the code that you use when i try to upload the code, the program send me this message sketch_sep07a:6: error: 'Hx711' does not name a type
sketch_sep07a.ino: In function 'void setup()':
sketch_sep07a:11: error: 'scale' was not declared in this scope
sketch_sep07a.ino: In function 'void loop()':
sketch_sep07a:16: error: 'scale' was not declared in this scope
And i already uploaded the library that you put in web page

I hope can you help me with this issue.

Thanks.
Regards

[bogde]

do you have:

#include "HX711.h"

at the top of your sketch file?

are you using
Hx711 scale(A1, A0);
or
HX711 scale(A1, A0);
?

use HX711 scale(A1, A0);

does the included example (HX711Serial) work?

[vejo17]

Hi
I use HX711 scale(A1, A0), but the program send me the next message:sketch_sep08b.ino: In function 'void loop()':sketch_sep08b:12: error: 'class HX711' has no member named 'getGram'.The example (HX711Serial) is working correctly.
Im using this code:#include <HX711.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);HX711 scale(A1, A0);void setup() {lcd.begin(16, 2);}void loop() {lcd.setCursor(0, 0);lcd.print(scale.getGram(), 1);lcd.print(" g");lcd.print(" ");delay(200);} but in the blue line im having a mistake. Can you tell me how to resolve this issue ? Or if i have to use another function?
And thanks for your answer
Date: Sun, 7 Sep 2014 22:30:27 -0700
From: notifications@github.com
To: HX711@noreply.github.com
CC: lavadero_jorge@hotmail.com
Subject: Re: [HX711] Library HX711 (#10)

do you have:

#include "HX711.h"

at the top of your sketch file?

are you using

Hx711 scale(A1, A0);

or

HX711 scale(A1, A0);

?

use HX711 scale(A1, A0);

does the included example (HX711Serial) work?

—
Reply to this email directly or view it on GitHub. =

[bogde]

there is no method getGram. see here for the methods you can call:
https://github.com/bogde/HX711/blob/master/HX711.h

see the example for a proper usage.

[r-a-i]

I ran into this issue too.

The documentation on ./README.md says that in the non-blocking mode we should:

// 4. Acquire reading without blocking
if (scale.wait_ready_timeout(1000)) {...

Instead, it should say:

// 4. Acquire reading without blocking
if (loadcell.wait_ready_timeout(1000)) {...

for consistency with the definition at the start of the example
HX711 loadcell;

[amotl]

Dear @r-a-i,

may I humbly ask for a pointer where you found this inconsistency? I just skimmed [1] and can't find any typo in there.

With kind regards,
Andreas.

[1] https://github.com/bogde/HX711/tree/master/examples

[amotl]

may I humbly ask for a pointer

Reading things more concentrated always makes sense. Sorry again for overlooking your reference to README.md.

You are absolutely right. When fixing this, we might also think about making the example in README.md consistent with the example files referenced above, right?

Would you personally prefer scale oder loadcell as the name for a canonical variable name referencing the HX711 object? Technically, just calling it hx711 would also be fine but might confuse newcomers.

... just wanted to mention that I acknowledge we should bring more consistency into the code examples and that I am personally open for any better name if desired.

[r-a-i]

Dear @amotl, I just submitted a pull request for this change for your consideration.

Personally, I think the variable name "loadcell" is more generic as the "Hx711" is a loadcell amplifier. Some people may use loadcells to build "scales", but not always. In my case, I'm using a loadcell to measure a force directly and not weight.

Thank you for your consideration and all your contributions to this library.