Way hay, I can program this this (in a wierd way)
I have to use a 01.uf cap and a different ftdi adapter.

@wschnell 在 Connecting multiple I2C devices 中说：

@calin those who use Grove certainly are.

don't know... i never used that one... didn't even attempted...

from what I could find, the specs are identical except for 2 changes: the replacement of the 9250 with 2 chips (the MPU6050 and the MAG3110); and the upgrade of the battery (150 mAh to 600 mAh)

@ajb2k3 在 PID and VID of the M5Stack? 中说：

What is the PID and VID of the M5Stack?

USB\VID_10C4&PID_EA60

0_1530137121752_vid_pid.PNG

I can power it through my mobile phone charger or a battery pack, just using a tiny USB3 Adapter; and I can power it off my solar panel. I just like the idea of having a web server (or whatever else I made ...) that I can plug into an AC socket.

Can only be mechnical, meaning the connectors don't quite mate without the proto board in-between. Try pushing a little harder?

Hi @ajb2k3,

I gather you are talking about the internal MBUS GPIO pins - that connect the modules together.

The pin pitch - distance between the pins - is 2.54 but the pins are height reduced compared to those found on a standard GPIO header - too SHORT for Dupont connectors to attach.

The MBUS pins are intentionally height reduced in order to minimise the overall height of the M5Stack.

It is possible to source a third party full height 30 pin GPIO header if needed, or you can make one using a GPIO for Arduino or Raspi. You could get a PCB made to go with it, based on the files available on github, see here.

0_1529224923070_M5Rapr.png
Something like this (if you look closely you can see the software failed to make all connections.

Hello,

thank you for your reply. I'v tried to only use the CS pin and it works, but... yes, there is always a but :-) the results are not very accurate. From the moment a set a brightness in the screen, the values of the temperatures grows.

I try to read the temp in a separate task, but it didn't change anything.

Here is my code

#include "Adafruit_MAX31855.h" #include <SPI.h> #include <M5Stack.h> // Example creating a thermocouple instance with software SPI on any three // digital IO pins. #define MAXCS 17 Adafruit_MAX31855 thermocouple(MAXCS); void task1(void * pvParameters) { for (;;) { float avg = 0; /* Read nbReadToAvg times to make an average of the temp */ for (int i = 0; i < nbReadToAvg; i++) { float c = thermocouple.readCelsius(); avg = avg + c; delay(100); } avg = avg / nbReadToAvg; Serial.println(avg); } } void setup() { Serial.begin(115200); Serial.print("MOSI="); Serial.println(MOSI); Serial.print("MISO="); Serial.println(MISO); Serial.print("SCK="); Serial.println(SCK); Serial.print("SS="); Serial.println(SS); thermocouple.begin(); Serial.print("Internal Temp = "); Serial.println(thermocouple.readInternal()); while (!Serial) delay(1); // wait for Serial on Leonardo/Zero, etc Serial.println("MAX31855 Initializing ..."); // M5.Lcd.setTextColor(WHITE, BLACK); // wait for MAX chip to stabilize delay(1000); xTaskCreatePinnedToCore( task1, "task1", 4096, NULL, 1, NULL, 0 ); Serial.println("M5 begin without LCD"); M5.begin(false, false); delay(10000); Serial.println("LCD Start"); M5.Lcd.begin(); for(int j=0;j<100;j++) { //Serial.printf("Brigthness=%d\n", j); M5.Lcd.setBrightness(j); delay(200); } //delay(10000); Serial.println("LCD Shutdown set Brightness to 20"); M5.Lcd.setBrightness(10); //M5.Lcd.sleep(); M5.Lcd.setTextSize(4); M5.Lcd.print("test"); M5.update(); } void loop() { }

And here is the result :

20.27 20.50 20.35 20.45 20.27 18.52 20.12 20.58 20.42 LCD Start 20.27 18.60 21.55 22.73 21.58 21.77 21.98 20.87 21.40 22.40 21.65 23.60 23.40 24.02 24.48 24.62 24.55 29.67 26.83 25.52 29.15 LCD Shutdown set Brightness to 20 23.48 22.27 22.15 21.50 22.92 20.50 21.67 22.60 21.92 22.12 22.42

Why can see that between the line LCD start and the LCD shutdown, the temperature grows and that why the brightness of the screen is increasing. After the line "LCD Shutdown" the brightness is set to 20 and the value are higher that the values at the beginning but they don't moved.

Hi, I had the same problem as you, my M5stack did not connect or crash if you did it by force, for cons I solved my problem by installing a new firmware and changing USB port, I was on a HUB and now I'm using a USB port on my PC

Link of the firmware : https://github.com/botofancalin/M5Stack-MultiApp-Advanced

No response from the m5 team on twitter so I returned it through Amazon.

Thanks you so much for your reply !
So, right now I'm understanding that I will have half IO than expected...

Thanks again, It helps me a lot
See you

@hypnos
CP2014 controls the USB to serial connection....

COM port connection problems can result from other things: using the old driver (Windows), faulty USB cable, etc.

However the CP2014 should NOT be so hot that you can't touch it and leave your finger there.

Q - Is it that hot ?

If it is, then yes perhaps don't use the battery with this unit.

If the chip is super hot (and your COM port is working for other devices) you could also look to contact your supplier.

I've tested lots of M5 units and use 4 regularly and have not had this problem. I also haven't heard of anyone else having this problem.

If you get another M5 I would not at all expect this to happen again.

For those who have 'battery issue' with their M5Stack; please, use the 'contact now' button on any product page of our Aliexpress store to contact with our after-sale team. We will try our best to bring you a satisfying purchase experience.

@jimit sounds good! thank you.

@drwino
:-)
Good luck.

use "Preferences" class
#include <Preferences.h>

Preferences preferences;

void setup() {
Serial.begin(115200);
Serial.println();

// Open Preferences with my-app namespace. Each application module, library, etc
// has to use a namespace name to prevent key name collisions. We will open storage in
// RW-mode (second parameter has to be false).
// Note: Namespace name is limited to 15 chars.
preferences.begin("my-app", false);

// Remove all preferences under the opened namespace
//preferences.clear();

// Or remove the counter key only
//preferences.remove("counter");

// Get the counter value, if the key does not exist, return a default value of 0
// Note: Key name is limited to 15 chars.
unsigned int counter = preferences.getUInt("counter", 0);

// Increase counter by 1
counter++;

// Print the counter to Serial Monitor
Serial.printf("Current counter value: %u\n", counter);

// Store the counter to the Preferences
preferences.putUInt("counter", counter);

// Close the Preferences
preferences.end();

// Wait 10 seconds
Serial.println("Restarting in 10 seconds...");
delay(10000);

// Restart ESP
ESP.restart();
}

void loop() {}