Posts made by felmue

Hello @digs71

esp_sleep_enable_gpio_wakeup can only be used for light sleep but not for deep sleep. See ESP32 sleep modes.

If you want to use deep sleep check out this example.

Please also check out this article about different sleep modes.

The sleep functions are not M5Core2 specific. They are functions of the ESP32 so it should work on all devices using ESP32. It is normal for them to be found in esp32 related libraries, but not in the M5Core2 library.

Both my sleep examples have been tested on an M5Core2 (under ESP32 Arduino framework 2.0.4 and 2.0.5), so I am stumped as to why it fails for you.

Could you please post the debug log - hopefully this will shed some light on the reason for the reboot.

Thanks
Felix

Hello @ispybadguys

the debug output suggests that as soon as the I2C port scan starts (first dot) your M5Paper seems to reboot.

• Have you tried a different / shorter USB cable? Maybe the issue is power related?
• Does the touch example (requires internal I2C) work?

Thanks
Felix

Hello @Gorilla

thank you for reporting back. I am glad you figured it out. And yes, there were some recent changes to the EXTIO2 library regarding I2C so getting the latest is key.

Thanks
Felix

Hello @Devan

please check out my example here.

Thanks
Felix

Hello @ispybadguys

that is very weird - I am stumped.

Have you tried to only scan the ports by commenting these two lines:

//  Serial.println("I2C Scan - internal");
//  scanI2C(i2cBus_Internal.wire, i2cBus_Internal.sda, i2cBus_Internal.scl);

BTW: I also get a 4 seconds delay before OK is printed out - so that should be fine.

Thanks
Felix

Hello @ispybadguys

please find the I2C internal and all port scanner (which works for me) here.

Thanks
Felix

Hello @teastain

FYI: getting access to the programming pins isn't that hard. However if you'd like to run anything on the internal ESP32 that requires WiFi, you'd need to add a WiFi antenna. The traces are there on the board but the necessary parts are not populated.

Thanks
Felix

Hello @ispybadguys

are you saying that simply calling M5.begin() in setup(), e.g.

#include <M5EPD.h>
void setup() {
  M5.begin();
}

void loop() {
}

produces M5EPD initializing...OK over and over again?

Thanks
Felix

Hello @digs71

esp_sleep_enable_touchpad_wakeup(); is meant for when some of the ESP32 GPIOs are used as capacitive touch pads. They are completely different form the M5Core2 touch screen.

Have a look at this example which puts ESP32 into light sleep which then can be woken by touching the screen.

Thanks
Felix

Hello @ArminFriedel

to change the mode do the following:

• remove power
• press and hold button
• apply power --> RGB LED should blink rapidly
• short press button until the RGB LED rapidly blinks in the color of the mode you want
• confirm mode with a long press

If you want to modify the internal firmware you need to open the case to access the standard connector to flash the internal ESP32. Check out the schematic - J1 is the programming connector.

Standard firmware can be found here. You'll need the Espressif ESP-IDF environment to compile, link and flash.

Thanks
Felix

Hello @Marelli7

you are welcome. I sounds like you are having fun. And thanks for reporting back. I am glad to hear you got it working to your liking.

Thanks
Felix

Hello @ispybadguys

calling M5.begin() already takes care of Serial and Wire. I suggest you only call M5.begin() (which also initialises other M5Paper hardware) in setup().

As for the I2C scanning on the three ports. The latest ESP32 Arduino framework doesn't allow to just call Wire1.begin() repeatedly with different GPIOs for SDA and SCL. If you look at the debug output you'll see this warning [ 41263][W][Wire.cpp:204] begin(): Bus already started in Master Mode. every time you try that in the loop().

So when the scanning is done for one port you need to call Wire1.end() before calling Wire1.begin() again.

Thanks
Felix

Hello @teastain

there where some changes in the ESP32 Arduino framework which added functionality to setup an ESP32 as an I2C slave. Unfortunately this broke some of the M5Stack libraries.

Please make sure you re-install the EXTI02 library to get the latest changes. Alternatively check this file M5Unit-EXTIO2/src/M5_EXTIO2.cpp and see if the begin() already has the (int) typecast like below.

_wire->begin((int)_sda, (int)_scl);

Note: The (int) typecast ensures that the begin() for an I2C master is called (and not an I2C slave).

Thanks
Felix

Hello @Marelli7

the IDE version is quite old and as I understand no longer maintained. I don't think you can add unlisted units to it.

When UIFlow firmware is burned and running on your M5Core2 use M5Burner to set SSID and password. It should then connect to your WiFi and the UIFlow (online) backend.

UIFlow, running in the browser, also connects the the backend. You then type in the ID that is shown on the M5Core2 screen and the browser and the M5Core2 then talk to each other through the backend.

Note: for that to work no USB connection is needed.

Thanks
Felix

Hello @Gorilla

in the program you've posted t_erro is always 0.

Thanks
Felix

Hello @AEisele55

most M5Stack devices (including M5Core2) use the ESP32 and yes, the GPIOs of the ESP32 are not 5 V tolerant. I am sorry for not thinking of that. So if the outputs of the rotary encoder are 5 V you would need to add some kind of level shifters.

Note: the power supply on the Groove port is 5 V, but the two GPIOs are only 3.3 V.

Thanks
Felix

Hello @robjasey

the description is misleading, I can use both modes and they do as I'd expect. Synchronous mode: relay and LED go together. Asynchronous mode: relay and LED can be controlled separately.

Here is what I found using UIFlow 1.10.6 and the 4-Relay unit:
Synchronous mode:

• turn on relay works (LED turns on too)
• turn off relay works (LED turns off too)
• turn on LED does not work
• turn off LED does not work

Asynchronous mode:

• turn on relay works (LED does not turn on)
• turn off relay works (LED does not turn off)
• turn on LED works
• turn off LED works

I suggest you just give it a try.

Thanks
Felix

Hello @AEisele55

I tried to compile the libraries source code (Encoder / TimerOne) of that rotary knob for ESP32 and it fails with lib/TimerOne/TimerOne.h:39:10: fatal error: avr/io.h: No such file or directory. I think the reason is that the source code is meant for Arduino AVR boards which are different from ESP32 boards. While you might be able to physically connect this rotary knob to an M5Core2 you need to be prepared to adapt the library to work with ESP32 on your own.

That said, are you aware that I2C is a bus system which allows multiple devices to be connected in parallel? The two devices can be controlled by the M5Core2 using their respective I2C address: Encoder: 0x40; Dlight: 0x23. You'll need a hub like this one.

Thanks
Felix

Hello @Marelli7

yes, you can use UIFlow and Arduino IDE alternately. UIFlow is just another ESP32 firmware.

While those units use the same STM32 chip the firmware inside the STM32 chip is different.

I do have the unit EXTIO2 (which uses the same internal STM32 firmware as Stamp I/O) and it works fine with my M5Core2 after adapting the M5Stack example for M5Core2 by replacing those two lines:

#include <M5Stack.h>

while (!extio.begin(&Wire, 21, 22, 0x45)) {

with

#include <M5Core2.h>

while (!extio.begin(&Wire, 32, 33, 0x45)) {

like you did.

Note: Make sure you have installed the latest M5Unit-EXTIO2 library. It has been fixed as well for the I2C master slave issue, but the version number has not been increased. So you probably need to re-install it in your environment manually. If your installed version has this line

_wire->begin((int)_sda, (int)_scl);

then your version already has the fix. Note the two (int).

Thanks
Felix

Hello @Marelli7

hmm, not sure what's going on.

Could you try installing UIFlow firmware (using M5Burner) onto your M5Core2 and then use UIFlow online? I've checked and the Encoder Unit is available for M5Core2. That would tell us that the hardware and setup is ok.

Thanks
Felix