@ajb2k3 Hey, Thank you

@skelstar Hello Please contact with this email, it will help you contact HW engineer of M5Stack tech@m5stack.com

Author of the aforementioned thread here. The hardware mod is the only solution for complete silence - the amplifier inputs will always pick up noise from something. If you look at commercial DAC + amplifier ICs, they also mute the amplifier after a period of silence so it's a common issue.

Hi Now I'm trying the example code of GSM.h to set up a web server. https://www.arduino.cc/en/Tutorial/GSMExamplesWebServer It output a lot of error [image: 1539590014039-01fe194e-2960-4594-a9fe-bacc2bed1fbd-image-resized.png] Anyone knows what happened? thank you

@rop @ajb2k3 I have no idea. So i just force disconnect if the RSSI of the WiFi is too low.

@lukasmaximus Thank you for your comment. I'll see Youtube later.

@watson Hello Watson, I did all you asked and it still doesn't work.[image: 1537997576707-screen-shot-2018-09-26-at-5.20.59-pm.png]. The COM port is open and selected. When I try the hello world sketch I get the following error: A fatal error occurred: Invalid head of packet ('5') A fatal error occurred: Invalid head of packet ('5') Thanks for any help.

Have a try with this link. You can burn the firmware with a easier tool. https://m5stack.readthedocs.io/en/latest/get-started/how_to_burn_firmware_en.html

Here is the article about programming with Arduino IDE For Windows: https://m5stack.readthedocs.io/en/latest/get-started/m5stack_core_get_started_Arduino_Windows.html For MacOS: https://m5stack.readthedocs.io/en/latest/get-started/m5stack_core_get_started_Arduino_MacOS.html

I had the same bizarre issue and I found the solution here ! Just turn the USB C plug around and it works ! Weird.

finally have some time to continue on with this, I tried the esp32 download tool with exactly the parameters above and the demo files and I am getting an error in the CMD window of .. "imageIsOk()" failed at ....\src\msw\bitmap.cpp(922) in wxBitmap::CreateFromImage(): invalid image even if I only select the bootloader.bin section or any single part. odd .. so I looked at using the esptool.py supplied and copied the loader script from the flash.sh (made for linux), that works but I get exactly the same failed to connect as I do with platformio and also the same timing looking at pulseview, not surprising since both methods rely on esptool. So I ended up adding a 100nF between the B-E of VT1, oddly enough I cannot see any improvement in the timing on pulseview but it programmed first attempt and every one thereafter so I am leaving it in place. perhaps the timing the ESP sees is a little different to what my salaea clone probe is showing.

@loboris I understand it. Thank you for your reply.

user this template: https://github.com/m5stack/M5Stack-platformio

Thank you for you help, now I solved the problem with esp32_digital_led_lib library. Example: [CODE] #include "esp32_digital_led_lib.h" // Enumberation ob LED's // 9 0 // 8 1 // 7 2 // 6 3 // 5 4 #define LED_PORT 15 strand_t m_sLeds = {.rmtChannel = 0, .gpioNum = 15, .ledType = LED_WS2812B_V3, .brightLimit = 32, .numPixels = 10, .pixels = nullptr, ._stateVars = nullptr}; void Led_Init(void) { pinMode (LED_PORT, OUTPUT); digitalWrite (LED_PORT, LOW); if(digitalLeds_initStrands(&m_sLeds, 1)) { E_TRACE("Can't init LED driver()\n"); } digitalLeds_resetPixels(&m_sLeds); // Set led 7 to red m_sLeds.pixels[7] = pixelFromRGBW(55, 0, 0, 0); digitalLeds_updatePixels(&m_sLeds); } [/CODE]

@gadjet OK got it to stop making a continuous beep by adding the M5.update(); in the loop. Volume still doesn't work though.

Strange that this never affected me. But I've added a note to the LoRa section of my big post about all these boards.