Impossible to flash/communicate about nodemcu-devkit-v1.0 HOT 19 OPEN

change the USB cable.. had the same issue, resolved after changing the cable.

from nodemcu-devkit-v1.0.

Same issue here... Still can't flash the firmware...

Update:
I suggest you to try a new nodemcu. Those annoying errors has gone when I use a new one.

The RX on your nodemcu may broke:

1. I can receive some messages from nodemcu, such like "Please run file.remove("user.lua") before first use." but doesn't reply me anything when I try to send command, for example: file.remove("user.lua")
   Maybe RX issue
2. It always stuck on "Waiting MAC" when I try to flash firmware using firmware flasher.
   Maybe RX issue
3. "A fatal error occurred: Failed to connect to ESP8266" when I try to use esptool flashing firmware
   Maybe RX issue

from nodemcu-devkit-v1.0.

Try holding down the GPIO/reset button on your MCU, and then flash whilst still holding down. This worked for me.

from nodemcu-devkit-v1.0.

And here same issue. I operate PC Windows 10, And Android...,.But it's waiting for mac

from nodemcu-devkit-v1.0.

Just reconnect the usb cable keeping the flasher open
Look for log for below line ->

Note:Detect serial port changed.
Note:Auto MAP serial port.Port-->COM5

Then you should be able to flash. Looks like the tool cannot detect already connected device.

Just reconnect the usb cable keeping the flasher open
Look for log for below line ->

Note:Detect serial port changed.
Note:Auto MAP serial port.Port-->COM5

Then you should be able to flash. Looks like the tool cannot detect already connected device.

That's not the issue, it's able to detect the right com port right from the start

from nodemcu-devkit-v1.0.

Found this page when dealing with the same problem. Swapped out USB cables to no avail. A little bit more searching and I found this which wound up fixing it for me - maybe it might be helpful to others:

http://kig.re/2014/12/31/how-to-use-arduino-nano-mini-pro-with-CH340G-on-mac-osx-yosemite.html

from nodemcu-devkit-v1.0.

I realize this is a year later so unlikely someone still working on it... but in my case for a different board I had this same problem with RST/D0 were connected for deep sleep.

from nodemcu-devkit-v1.0.

Hey, did you ever figure this one out? I'm having pretty much the same issue on a Mac with a nodeMCU Amica board (uses a CP102 USB-UART bridge, installed the SiLab driver, etc). I have tried multiple baud rates but always get the same response: A fatal error occurred: Failed to connect to Espressif device: Timed out waiting for packet header.

I have tried multiple USB cables and multiple NodeMCUs to no avail. Really bummed right now...

from nodemcu-devkit-v1.0.

@JayPalm did you try the link I listed in my last comment?

from nodemcu-devkit-v1.0.

Facing the same issue.. Anyone found the cause of the problem? or a solution that worked..

from nodemcu-devkit-v1.0.

Any luck yet? I had a couple of thoughts. Mostly around possibly weak components. Do you have any sort of oscilloscope? I bought a Hantek digital one that connects to the computer and does fairly good. That would go a long ways to checking things like power supply voltages and noise on the lines. But without you can still probably locate the issue. A couple of things you can try. That is put a capacitor between 3v3 and Gnd as an extra filter. USB interfaces are notoriously noisy. There is also an Espressif forum for issues with the ESP8266 and ESP32 devices. You might post there too.

from nodemcu-devkit-v1.0.

Just reconnect the usb cable keeping the flasher open
Look for log for below line ->

Note:Detect serial port changed.
Note:Auto MAP serial port.Port-->COM5

Then you should be able to flash. Looks like the tool cannot detect already connected device.

from nodemcu-devkit-v1.0.

i had same issue. i change usb cable and tried different values for advanced setting on Nodemcu. and it worked by
-Baudrate 9600, -flash size 4Mbyte, -flash speed 26.7mhz, -spi mode DIO

from nodemcu-devkit-v1.0.

Same issue. Won't flash

from nodemcu-devkit-v1.0.

That's not the issue, it's able to detect the right com port right from the start

did you try by another usb cable. i had same issue and changed the cable. i tried by my printers cable and it worked :)

and i attached the picture of working settings on my ESP8266 -ESP 01

from nodemcu-devkit-v1.0.

Okay I resolved this for me. You just need to hold down the flash button (on the board) until you see the status bar moving forward after pressing flash

from nodemcu-devkit-v1.0.

Mine was fixed by putting the board to an oven for two minutes. Looks like a weak components issue

from nodemcu-devkit-v1.0.

I am also having the same issue. It says “waiting mac” however my FTDI and ESP is flashing red and the ESP was also flashing blue for a couple seconds then stopped. Is there anything I am doing wrong here?

from nodemcu-devkit-v1.0.

I had the same problem but i solved it, it was my usb port. Looks like it the current of that one was to low. So try a different usb port!

from nodemcu-devkit-v1.0.