@domi
Are you using the "4Relay module" or the "4Relay unit" or the "2Relay module" ?

If you still get an error, try to make a simple Uiflow programm scanning the i2c bus with the 4Relay connected:

You should get the number [38, 117] displayed as Label0, 38 is the decimal for 0x26.
If you get 37 you have another firmware than I have (I2C address 0x25).
If you only get [117] your 4Relay module is not connected to the M5Stack core. 117 (0x75) is the I2C address of the battery management chip.

@ajb2k3 A deaktivated PIN code doesn't mean that the SIM card is deactivated. SIM Cards are normally designed for cell phones and the provider gives you a new SIM Card locked with a PIN code and a PUK Code. (3-5 times entering a wrong PIN code blocks the SIM card and you have to enter the correct PUK code to unlock the SIM card. Entering a wrong PUK code several times will brick your SIM card and you have to get a new SIM card). Putting the SIM card into a cell phone the first time you will have to enter the SIM card PIN in order to unlock and to have access to the the SIM card. You can also use a PIN locked SIM card in an M5Stack GPRS/LTE module sending the right AT-command with the PIN required to unlock the SIM card. An easier way is to deactivate entering the PIN every time at startup with a cellphone: Put the new SIM card (per default locked with a PIN provided by the SIM card provider) in a cell phone, enter the PIN in order to access the SIM card. Then, in the cell phone setup menu: allow using the SIM card without entering the PIN code when you turn on the cell phone . (You normally protect the cell phone with a separate PIN code, so you don't want to enter 2 PIN codes every time you turn on your cell phone) . Now the "PIN-unlocked" SIM card can be used (and is active!) in an GPRS/LTE device without entering the PIN code. I have been using this routine regularly for the SIM-Cards I put in my GPRS/LTE WiFi mobile router, giving me internet access when I am away from home (I don't trust public [sniffing] WiFi networks ...).
PS: Putting the SIM Card into a cell phone also allows you to change the PIN code provided with the SIM card eg. "1234" to "0000".

@ajb2k3 You are talking about the 2Relay-UNIT ... with the black (analog/digital) grove port !!
The M5Stack MODULE 13.2 we are talking about ( https://shop.m5stack.com/products/2-relay-13-2-module) has a STM32F030 controller acting as an I2C interface controlling the 2 relais : The I2C address according to their documentation is 0x25 (mentioned in the features section) or 0x26 (according to their arduino or blockly section). The firmware is +/- the same as with the 4Relay module and the 4Relay Unit (https://shop.m5stack.com/products/4-relay-unit with the red I2C grove port, I2C address 0x26).

M5Stack have messed up with their xRelay modules and units. They are all adressed by I2C, but all require different commands depending on the firmware they have used, So using the proposed uiflow blocks won't work, you have to use the I2C blocks (See my forum post for the 4-relay module).

For the 2-relay module the documents tell you that the I2C-Address is 0x26 (as for the 4-Relay Module). In the uiflow demo they are talking about address 0x25 ?? writing to control register 0xFF you can probaly change the I2C address of the module.
So you have to try out which commands work for you ...

https://forum.m5stack.com/topic/1419/m5stickc-sensor-sht-31

I don't think the PbHUB will work ... The PbHUB can only handle analog and digital signals (no clocks !). Reading values from the HX711 weight sensor needs a clock and a data line provided by the ESP32 GPIO Ports ... The UIFlow HX711 library only supports Port B.
If you want to use several weight sensors on the M5Stack you will have to hook them up to different ports and do the programming either in Python or Arduino using the Expansion Port Module getting the additonal Ports C D and E.

The M5Stack UIFlow libraries for 2Relay Module or the 4Relay Unit don't work for the 4Relay Module. So you have to use the I2C Master Blocks.

Here is an example using the M5Stack Core toggling 3 Relays using the buttons A B C:

UiFlow-Code (m5f): [https://forum.bastelgarage.ch/assets/files/2023-01-12/1673533548-943791-4relay6.zip)]

@dclaar
See https://www.geeksforgeeks.org/python-handling-recursion-limit/ :
by default, the value normally is 10^4.

@dwarrenku
Adafruit is using a programmed microcontroller in their stemma lines (Arm line) in order to interface different sensors to an i2c bus. M5Stack is using the same approach using the Atmel328 (Arduino line) microcontroller eg in their PbHub, servo controller, Makey etc. For the PbHub you can use the library provided or use the pure I2C blocks from the flow advanced sections. Using the I2C blocks I was able to read analog values from the PbHub, which is described in their unit data sheet, but the function is not provided as a flow block.

Adafruit doesn't provide the details in their documents for their STEMMA Soil Sensor. But I probably found a solution described in following forum
https://elixirforum.com/t/adafruit-stemma-soil-sensor-i2c/25990/2

I think you are facing 2 problems:
- timing problem ( you have to wait for for the sensor)
- in the Stemma line, you can change the I2C adress of the sensors writing the values into ??? register !

Because I don't have the STEMMA sensor, I can't try it out. But in my opinion, you don't need to include the seesaw STEMMA library (which may have the wrong timing for the M5Stack), but you can read the moisture values using M5Stack I2C blocks:

and translated into micropython:

@somedude
The M5GO/Fire Battery Bottom has got a microphone + a MAX4466 built in. According the schematics it is connected to GPIO 34 of the M5Stack core.