@gavin67890 , thank you so much for your reply. Highly valuable information I totally missed when browsing the m5stack website. I was in a rush to get going and I was mixing up modules.
The https://docs.m5stack.com/en/product_i2c_addr is especially valuable as I was struggling with those IDs.

My kit was using the SHT30 built into the base, while I was reading the docs and trying the code for the one with the SHT20. Having the exact same physical look was the main cause for my misunderstanding.

I really appreciate your help! Now I have everything up and running smoothly.

Thank you!!!

Hello,
Since the built-in temp/hum sensor of the PM2.5 module is not so accurate (probably due to the proximity with the main board) I am considering using the ENV III module to get the temp and humidity.

I suppose that the modules use the same I2C address so there will be a conflict if I connect ENVIII to the I2C bus.

My questios are:
is there a way to disable the built-in SHT30? Is using PaHUB a solution to have the ENVIII connected while the PM2.5 module is also connected?

Later edit:
I am testing using UIFlow , PM2.5 module, PaHub and ENV III.
While sometimes the app runs fine (only when the ENVIII is in PORT0 of the PaHUB), the values displayed seem to be from the built-in module.
When I move the ENVIII sensor to another port, the app just crashes with the CRC error message

Thank you!

It works!!
Thank you for the suggestion @gavin67890!
The temperature is about 6 over and the humidity is 10% less than what my desk station is showing me, but I am glad that the hardware is ok.
Now, to inspect the Python code and see where is the problem.

Also, one important aspect I was missing: the GitHub code was trying to read a SHT20 while the PM2.5 (K023-B) has a SHT30.

@gavin67890 Excellent idea! I will try that. Thank you!

I am facing a strange issue and I am sure there must be something I am missing, so I am kindly asking for your assistance.

I am testing this code: https://github.com/m5stack/M5Stack/tree/master/examples/Unit/PaHUB_TCA9548A

The PaHub scanner with a M5Core Basic device (the one in the PM2.5 Air quality kit).

The code uploaded with Arduino IDE works just fine. It displays existing addresses.
However, the code uploaded with VSCode with Platformio does not. It is not detecting any of the I2C device addresses.

The plafromio.ini:
[env:m5stack-core-esp32]
platform = espressif32
board = m5stack-core-esp32
framework = arduino
lib_deps =
m5stack/M5Stack@^0.4.6
closedcube/ClosedCube I2C Driver@^2020.9.8
closedcube/ClosedCube TCA9548A@^2020.5.21

I have checked the source code of the libraries used (M5Stack and ClosedCube_TCA9548A) and they seem identical.

I cannot understand what I a missing.

Thank you!

Hello,

I am struggling with an annoying issue.
I've just put my hands on an AirQuality Kit. It came with a pre-flashed app, that correctly showed values (the temperature was way hight, but I understand that this is a know fact).
After playing with UIFlow and nanoFramework, due to some issues I was unable to solve, I returned to the Arduino IDE.

I have uploaded an app from GIT (for the PM2.5) but it does not show the temperature any more:
https://github.com/m5stack/M5Stack/blob/master/examples/Modules/PM2.5_PMSA003/PM2.5_PMSA003.ino

Checking the source code, I noticed the:
#define SLAVE_ADDRESS 0x40

However, when I run a scan on the i2c bus, on my m5Stack, I see these ids:
44
75
80
C4
F5

So, I tried 0x40, but no luck. Also, other strange things happen in some situations:
Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC : 0x400d15fa PS : 0x00060730 A0 : 0x800d1713 A1 : 0x3ffb1f30
A2 : 0x3ffc01a4 A3 : 0x3ffc0640 A4 : 0x00000000 A5 : 0x3ffc0640

This is the KIT: https://docs.m5stack.com/en/base/pm2.5

Is there some place from where I can get the source code for the app that was originally on the device?