last known weight lost on reset about hx711

[electrokean]

Indeed - in my systems I store the offset in EEPROM, and can send a serial command to tare at any time. I also have an auto-tare function in my host code that triggers when the weight (and noise level) is below a certain threshold.
This compensates for drift over time and temperature, which is normal in load cells, but also accumulation of debris (sand & penguin droppings in my case). You'll need to determine if your accuracy requirements need that complexity.
Some good info on drift & noise here: https://phidgets.wordpress.com/2014/05/12/noise-and-drift-in-load-cells/

[bogde]

Did you try to remove scale.tare(); from your setup() section?

[mohanlate]

When I do, I get wrong results. I get 77 even when there is not weight. And when I put weight, I still get 77.

[electrokean]

Just like you've calculated your scale value, you need to calculate your offset (e.g. 77).
You then manually set it in setup() section using scale.set_offset(77);

[bogde]

that's correct. also, you can add something like a tare button to your device, read here to see what i mean by that: http://www.escali.com/blog/using-the-tare-feature-on-digital-kitchen-scales/

you can also add code to save the last weight value, offset etc., so in case of power loss or reset you can start with the last known values. that plus a tare button and maybe a way to set the offset using some kind of input would give you more flexibility.

[bogde]

@mohanlate do you still need any help with this?

[mohanlate]

Thanks for all the valuable help. I went back to using the original library
for the time being since it served my basic purpose.

On Wed, Apr 6, 2016 at 10:48 AM, bogde [email protected] wrote:

@mohanlate https://github.com/mohanlate do you still need any help with
this?

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#32 (comment)

[JoeToeniskoetter]

Just like you've calculated your scale value, you need to calculate your offset (e.g. 77).
You then manually set it in setup() section using scale.set_offset(77);

Could you help me figure this out? How do I go about calculating the correct offset?