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RobTillaart / SHT31_SW

Arduino library for the SHT31 temperature and humidity sensor - using SoftWire
MIT License
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Softwire sht31 with esp32 #11

Closed RichJ123 closed 11 months ago

RichJ123 commented 11 months ago

Does this lib work with esp32? I passed the compile and upload but temperature and humidity showed -45 and 0. Pin 26 27 were used instead of 6,7 as shown in your code. Thanks for any help. Richj

RobTillaart commented 11 months ago

Quite busy, will follow up asap

RobTillaart commented 11 months ago

Had to look into the softwire library and found this issue

https://github.com/stevemarple/SoftWire/issues/29

The third post mentions the Softwire library works on ESP32, so my assumption is it should work with the SHT31 too on the ESP32. Be aware that the Softwire probably cannot make very high clock speeds, so you might begin with 50K or so.

The discussion also mention more interesting details for the ESP32 like

If the drive capability of the ESP32 is weak you might find a I2C driver specifically designed for I2C helpful. I used a PCA9517A which is sold as a level-translating I2C bus repeater.

RichJ123 commented 11 months ago

I adjusted the clock speed to 50000 and 30000 via sw.setClock(30000); but nothing changed, still getting -45 and 0. I guess the softwire library itself may not be esp32-compatible. Anyway this is just for your info and thanks to you for the Twowire sht31 I am using. Cheers.

RobTillaart commented 11 months ago

Thanks for the follow up.

Did you have pull up resistors in place?

Can you try it one more time and use the esp32 wire pins for the test. 21 and 22 from my head.

I leave the issue open for a few more days. If time permits and I have hardware available I will investigate.

RobTillaart commented 11 months ago

Did a first test, which failed

    15364   -45.0   0.0 130
    15362   -45.0   0.0 130   //  82 hex
    367 -45.0   0.0 129  //  81  hex
    15362   -45.0   0.0 130
    15361   -45.0   0.0 130
    363 -45.0   0.0 129
    15361   -45.0   0.0 130
    15364   -45.0   0.0 130

the last number is getError() =>

Error interface

Error Symbolic Description
0x00 SHT31_OK no error
0x81 SHT31_ERR_WRITECMD I2C write failed
0x82 SHT31_ERR_READBYTES I2C read failed
0x83 SHT31_ERR_HEATER_OFF Could not switch off heater
0x84 SHT31_ERR_NOT_CONNECT Could not connect
0x85 SHT31_ERR_CRC_TEMP CRC error in temperature
0x86 SHT31_ERR_CRC_HUM CRC error in humidity
0x87 SHT31_ERR_CRC_STATUS CRC error in status field
0x88 SHT31_ERR_HEATER_COOLDOWN Heater need to cool down
0x88 SHT31_ERR_HEATER_ON Could not switch on heater

So the low level I2C seems to fail. So I'm on par wit you now :)

RobTillaart commented 11 months ago

Have tried different pins and settings and did not get it working, So far I can only get SHT31_SWW on AVR (UNO) working.

If time permits I will do some more tests this weekend.

RobTillaart commented 11 months ago

The Softwire library has an example listDevices but it did not work.

RobTillaart commented 11 months ago

As this is a problem of the Softwire library used I will close the issue. Feel free to add comments as I am always interested however I will not spend time to this issue at the moment. (other priorities)

RichJ123 commented 10 months ago

sorry I didn't login to github for long time. I have worked around the problem by using twowire with no problem. Thanks for your effort and MerryXmas and happy new year.

On Sat, Dec 16, 2023 at 7:24 PM Rob Tillaart @.***> wrote:

Closed #11 https://github.com/RobTillaart/SHT31_SW/issues/11 as completed.

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RobTillaart commented 10 months ago

@RichJ123 Best wishes to you too!