add example for eeprom for esp32

[Albalate]

Init proyect and use GND to pinout 2 for tare, and GND to 15 to enter calibrated mode

[RobTillaart]

This is an EEPROM example like HX_set_persistent.ino.

Primary goal of examples is to explain the library functions and so I am wondering what the difference / added value is of this example. I saw you extracted the calibrate code in a function.

Did not compare all the details but it looks more like an improvement or an upgrade of the existing example, not necessary a new example. What is the argument to make this an separate example?

[Albalate]

the HX_set_persistent.ino does not work with esp32 to read the eeprom. Today I will do tests with an industrial load cell to see if HX_delta_scale.ino does it correctly, I think it does not work. eeprom for esp32 need to initialize the eeprom in setup.

[Albalate]

tests performed: utilcell 30 KG load cell (https://www.utilcell.es/load-cell/300-model-load-cell/) hx711 esp32 result: +-150 units(gr)) ##################################### utilcell 30 KG load cell (https://www.utilcell.es/load-cell/300-model-load-cell/) hx711 arduino UNO R3 result: +-3 units(gr)) soft: // // FILE: HX_kitchen_scale.ino // AUTHOR: Rob Tillaart // PURPOSE: HX711 demo // URL: https://github.com/RobTillaart/HX711

[RobTillaart]

I see difference 3gr and 150 gr.

What voltage is applied to load cell? is it the same in both cases?

[Albalate]

voltage to hx711 is 5v in both cases (supply is stabilized with 2 output filters) more than a difference, I would say that it is a random measure in esp32

[RobTillaart]

Strange as the HX711 does the AD conversion and the communication to the processor is binary. Do you have a logic analyzer to capture the bits?

[Albalate]

I have the oscilloscope broken, it is due to the speed of the processor, with the library of "https://github.com/bogde/HX711" I get the same result in both hardware. +-4 gr whit scale off 30000gr When I have a while I'll help you find the error

[RobTillaart]

Mmm, difference between Bogdes lib and mine is using long versus float for the math. As the UNO with my lib gives the same results as Bogdes lib (within noise limits) the math is OK.

Can you print the raw values that are read from the HX711 by means of shiftin.

Line 75 or so in the .cpp file.

[RobTillaart]

30.000 grams loadcell. ~4gr is an accuracy of ~1 in 10.000 (quite good) What says the datasheet? Do you have a link?

Found datasheet 1 in 10.000 is the limit of the sensor so it won't get much better.

[Albalate]

in esp32 not work only work in arduino UNO When I finish the current work, I help you find the mistake, I understand that it may be mine

[RobTillaart]

When I finish the current work, I help you find the mistake, I understand that it may be mine

Any progress made?

[RobTillaart]

Any progress made? If not I better close this Pull Request

[Albalate]

no, I'm a little busy, when I return to the scale I reopen it if necessary Thank you

El jue, 2 jun 2022 a las 14:30, Rob Tillaart @.***>) escribió:

Any progress made? If not I better close this Pull Request

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