@felmue Now got some useful readings of Volts using the following code. Not sure about accuracy due to logarithmic scale. I've tested it with an AA 1,5 battery as input signal, connecting GND and ADC pin 32. As I already use a GPS and an expansion board, so at the moment SDA pin 32 at Core2 unit is the only available choice. My code:

execute:
from machine import ADC
adc=ADC(32)
adc.atten(ADC.ATTN_11DB)
while true (with blockly), execute:
signal = int(adc.read())
if signal == 4095:
signal = 0
percentage = float(signal / 4095 / 100)
volts = float(3.9 * percentage * 100)
label2 show volts (with blockly)

Now getting 0 at idle connection and +- 1.5 V when testing it with an AA battery as analog signal.

Under UIflow, I execute the following code on a Core2 device, signal from Port A, pin 32,
using a Micro-Python execution block:

from machine import ADC
adc=ADC(32)
signal = int(adc.read())

label1 show signal

The value obtained is always 4095, even if no voltage is present at the input pin 32.

Please give me some explanations how to connect and measure an analog signal (V) using the
M5stack core2 device.

Regards, Claude

Same situation here with a Core2 device (Location: Brazil, GMT-3, at 14:50, 02/02/2022). Thanks for checking.

The UIFlow web site is still down (location Brazil, GMT-3, 02/02/2022 at 10:15). Thanks for checking.

@felmue Thanks for support, problem solved.

Using the UIFlow V 1.9.0 at server https://flow.m5stack.com/ at the function "create a new project and clear workspace"
I'm not able to find the "import module" statement required for operation of the stackable GPS module. I'm able to create the "Init with custom pin TX, RX" statement selecting it from the GPS modules section, but the MicroPython code does not add the required "import module" command. This also creates a run-time error. Reverse edit from the Python syntax to UIFflow also is not allowed. Is this a bug in UIFlow or did I miss something in the GUI flow.

The H5Go Bottom module implements "HY2.0-4P-PortC(blue)" and by default points to GPIO13 (RXD2) and GPIO14(TXD2). The same pins are already in use by the GPS module part of the M5 Core2 stack (currently set to TX=14, RX=13). Is there a solution to operate both modules in parallel, the NB-IOT (Uart) unit and GPS module?

For M5GO BOTTOM2 component and available port B what is the UART interface numbering for RX and TX signals?
Want to connect an NB-IOT unit via an UART cable. I've already allocated pin 13 and 14 for the GPS unit in the stack.

The MQTT Adafruit forum told me: "An automatic process in order to synchronize the subscriber without any data loss?
You can - please see this documentation about retained values here:
[https://io.adafruit.com/api/docs/mqtt.html#retained-values](link url) “

Checking the Github I've found an open issue about support of the MQTT retain Flag in M5 UIFlow code. See: [https://github.com/m5stack/UIFlow-Code/issues/1](link url)

My PAHO subscriber client currently displays a zero value in the retain flag returned from the M5 publisher and Adafruit broker. Do you know the status of this issue?

Wonder if there is a function to control the power of GPS Unit in the M5 stackable unit, by software moving it into a “sleep”, or a “wakeup” mode, by this improving the overall power consumption. During normal operations, the GPS plus the Core2 together consume the battery capacity in less than 3 hours, including a M5GO power base. After this period, a recharge operation is required through the USB “C” cable, which takes around 30 minutes. For mobile use, would be nice to extend the power budget and autonomy of the M5stack.