I2C sht31 install

[alexvanuxem]

Hi

i connected a external I2c sht31 to a MBpro2.

I see it information tab as sht31ext.

how to get readings from it?

thx

alex

[admin]

What does "Monitoring - Live Data" tab tell?

[alexvanuxem]

Hi,

Nothing extra. My usual stations, and the data from the MB pro 2 itself, under station 9 (internal storage, uptime, internal temp and humidity, pressure,...), but an extra temp or humidity.....

thanks

[admin]

PRO2 takes it as a replacement for the internal sensor that does not show true indoor data because being in a heated up environment. So temp and humidity of thb0 are now the values from this external sensor.

Did you plan to use it as a more accurate indoor sensor replacement, or something else?

[alexvanuxem]

the system temperature stays the same when plugging the sht31 external one, even after rebooting.

one good thing: at first the MBpro2 was connected through lan, > no RF firmware update available

i changed it to wifi and then I could flash the RF firmware (but stays at FW 3.5?).

just letting you know

i want to use the I2C bus for calibrating temp hum and pressure with all my installed sensors right next to it (WLL, vantage with uwb logger, ecowitt)
thx

a

[admin]

i changed it to wifi and then I could flash the RF firmware (but stays at FW 3.5?).

There is no RF firmware 3.5. You see RF firmware version in "System - Logging" when using the RF function.

[alexvanuxem]

sorry my mistake,

can you explain why the internal temperature stays at +/- 33°c after attaching the sht31 module?

It should display a ambient temp of +/- 22°c or something, right?

[admin]

you need to do a reboot after installing the module. Can you please send output of

Code: Select all

http://ip-of-your-meteobridge/cgi-bin/system.cgi?cat%20/var/run/i2cdata

On a regular PRO2 it looks like this

Code: Select all

DATE 1749203446
SHT31INT 38.4 22
BMP390 1000.9 37.6
INA220 5.09 312 1.59
DEVICES 50

[alexvanuxem]

command: cat /var/run/i2cdata
-------------
DATE 1749225665
SHT31INT 34.5 25
SHT31EXT 27.0 42
BMP390 1009.5 33.7
INA220 5.22 270 1.41
DEVICES 54
-------------

Schermafbeelding 2025-06-06 180043.png (93.79 KiB) Viewed 2444 times

I need to see 27.0°C and 42% humidity under system#9 correct?

Grtz

A

[admin]

I need to see 27.0°C and 42% humidity under system#9 correct?

Yes, that is what I would expect to see. But your example does show different. I will check.

[admin]

just released SW version should add a "th9" to system station to represent the external SHT31 data. please give it a try.

[alexvanuxem]

HI

Thanks! it works! I guess it will work with any type I2C temp/huymidity sensor?

I will use this IC2C sensors to try to calibrate my weather stations.

If a pressure sensor would be attached, any type, you will need to add again an additional sensor ?

thx

alex

[admin]

currently just this external sensor is supported. As the PRO2 has a high quality BMP390 sensor inside, you should be fine on exact pressure data.

[alexvanuxem]

too bad,



it should be nice to just attach whatever i2c sensor to fully exploit this feature,

thank you for the support !!!!!!!