Hello @Surya

after long hours of searching and debugging I found the reason why I2C would fail. It starts to fail as soon as SSL is invoked. The SSL library uses an analog GPIO as input for its random seed. And in your code you used GPIO2 which is one of M5AtomS3 Groove GPIOs.

So to get rid of the I2C error try changing the GPIO used for random seed to GPIO10.

//SSLClient ethClientSSL(ethClient, TAs, (size_t)TAs_NUM, 2);
SSLClient ethClientSSL(ethClient, TAs, (size_t)TAs_NUM, GPIO_NUM_10);

Thanks
Felix

Hello @m5stack

thank you for letting us know about the latest UIFlow 1.7.3 firmware. I appreciate it.

It is however very unfortunate that the M5Core2 PaHub bug has not been addressed in this update. I'd appreciate if your engineers fix that bug in the next update.

Or, as stated already many times in many places, please open source the UIFlow code so we can help you fix issues like that.

Thank you for listening.

Felix

Hi guys

an M5CoreInk with ESP32 in light or deep sleep still consumes a couple of mA (which is to be expected given the hardware architecture). However M5CoreInk allows to shutdown ESP32 completely and later wake it up from the RTC timer or alarm.

For an M5CoreInk in shutdown mode I've measured a current (at the battery) of only about 2.5 uA which is pretty good. And yes, the ink display retains the last image.

Cheers
Felix

Hi guys

Here is an explanation as to why it may take some time to fix: M5CoreS3 uses the SPI bus in a special way to control the LCD: MISO (normally an input) is reconfigured to be an output and is used as DC line (instead of a dedicated GPIO for DC). Unfortunately to access the SD card (which shares the SPI bus with the LCD) MISO needs to be an input.

In case you might be interested. I found a way to do this switching back and forth between input and output for Arduino.

Thanks
Felix

Hello @Bipman

by default Port A is meant for I2C, but it can be used for I/O (Port B) or UART (Port C) as well.

Note: But please be aware, that it can be only one type of port at any given time. Also, since its default use is Port A (I2C) there are internal pull-up resistors (10 k) in place on both lines which might have a negative effect when used in a different mode.

If you need Port A and Port B at the same time there is the PbHUB unit which can be used to connect some of the Port B units.

If you need all three types of ports (A, B and C) together then I am afraid M5Cardputer is the wrong device to use as core. There are simply no more GPIOs available for a dedicated Port B and/or Port C. Please see schematic here.

Thanks
Felix

Hello guys

my M5Cardputer takes about 7 hours for a full charge from a completely discharged battery state.

Note: I soldered two LEDs to the charger IC CHRG and STDBY outputs and it switched from charging to standby after about 7 hours.

Thanks
Felix

Hello guys

the M5Cardputer doesn't have that hold button until green LED lights up mechanism. To put M5Cardputer into download mode use the method described here.

If you want to enter download mode, press and hold the G0 button on StampS3 before turning it on, then release it after powering it on.

Thanks
Felix

Hello @koreanEggCoffee

yes, that is possible - I am powering my M5Atom this way.

However please note: There is no protection against wrong polarity so please be careful not to accidentally swapping 5 volts and GND.

I also suggest you disconnect the external 5 volts before connecting USB-C. Or in other words only connect one power source at the same time.

Please also refer to the M5Atom schematics which outlines the 5 volts connections between USB, 5v pin, Groove, LEDs and 3.3 volts regulator.

https://docs.m5stack.com/#/en/core/atom_matrix

Cheers
Felix

Hello @tomtom22

G1 and G2 are available on Port A. You are correct, G38 and G39 are not available as general IO on the M5AtomS3. They are used for I2C (and yes. the IMU is already connected to them) but additional I2C devices can be added here. M5AtomS3 documentation can be found here.

Thanks
Felix

Hello @mm-uiflow

yes, I think to successfully connect to blynk.cloud.com the template id is required as well. See here - check section [IMPORTANT] a bit down the page.

I've done a quick test with Arduino Blynk code and my M5Core2 connected immediately. But with UIFlow my M5Core2 doesn't connect at all.

I think UIFlow Blynk blocks need to be adapted to the new template id requirement.

Thanks
Felix

Hello @YigalB

yes, the I2C address is stored in flash. There is no need to repeat that step (changing I2C address) after every power up. It just needs to be done once.

Alternatively you can use a PaHub like @teastain suggested.

Thanks
Felix

Hello @Coopersmith-24601

glad to hear that the RGB example helped.

The four pogo pins are GND, 5V, SDA and SCL. E.g. power and I2C. See top right corner of schematic - Socket_Power_4P.

Firmware download uses a serial connection and not I2C. In other words the M5GO/FIRE Battery Bottom Charging Base can only be used to charge the battery.

Edit: I just confirmed by opening it: only GND and 5 V are connected at the USB-C port.

How do you know the battery isn't getting charged? Isn't there a red (or green) light?

Thanks
Felix

Hello @Coopersmith-24601

Re charging: the M5GO3 has its own charger IC built-in. A red LED indicates charging and when the battery is full the green LED in M5GO3 lights up. The built-in charger IC cannot be queried by software; is that what you mean by 'data'?

Re RGB: please find an example in the UIFlow2 Project Zone: M5CoreS3_M5G03Bottom_RGB_UIFlow2.1.3

Thanks
Felix

Hello @aitech

have you double-checked that port A actually has power? You'll need a multimeter for that and measure between black (GND) and red (5 V) wires.

Thanks
Felix

Hello @aitech

did you adjust SDA and SCL accordingly? The example is for M5Core which uses different GPIOs on port A (red) than M5CoreS3.

Try changing this line:

Wire.begin(21, 22);

to

Wire.begin(2, 1);

You can also try the I2C scanner (internal and port A) from here.

Thanks
Felix

Hello @IAMLIUBO

thank you for confirming, much appreciated.

In the past I worked on projects which had similar restrictions - for various reasons some parts had to stay close - so I fully understand.

BTW: no need to be sorry. I am very glad most of UIFlow2 firmware is open source, so thank you for that.

Thanks
Felix

Hello @ajb2k3

I doubt it. M5Things has been introduced over a year ago with this commit as far as I can tell.

Also M5Things is available (and used to contact M5Stack backend) when firmware is installed from M5Burner.

BTW: It is also used to display the user avatar etc. on the screen, which I believe you worked on.

Thanks
Felix

Hello @rodrigob

I did some research as well and I cannot find where M5Things is implemented. I also tried released firmware from github - see here - and it also fails to connect via WiFi to the M5Stack backend.

Everywhere M5Things is used it's enclosed by a try / except statement which clearly indicates that it is anticipated that in some cases M5Things might not be available.

Another observation is that this time M5Burner already offered UIFlow firmware v2.1.3 while the github repository still showed v2.1.2 being the latest.

All that makes me wonder about whether firmware for M5Burner is actually being built with additional source files - containing the missing M5Things - but which are hosted somewhere else and are not available to the public.

Thanks
Felix

Hi guys

@ajb2k3 : Groove2Groove 5 V line is not connected between the white and black Groove connector by default as R1 isn't populated (at least not in my unit). See schematic here.

@l-roca : the wiring goes as follows:

ext. 5 V        Groove2Groove        FAN
 5 V (red)  ---> 5 V     5 V --->  (red) 5 V
GND (black) ---> GND     GND ---> (black) GND

                 GND   5 V  D.IN
               (black)(red)(yellow)
                  ^     ^     ^
                  |     |     |
                  |     |     |
                M5Dial  (Port B)

You can find the UIFlow2 example in the Project Zone: M5Dial_Grove2Grove_Test_UIFlow2.1.3

Thanks
Felix

Hello @PascalS

at least we know now that the hardware is ok.

Apart from that I am stumped. Sorry.

Thanks
Felix