ESP8266 Community Forum

- Sun Apr 12, 2015 4:29 pm #14313 Just got my first nodemcu development board (I mean this one http://nodemcu.com/index_en.html#fr_547 ... 1a3600009e). Downloaded the nodemcu-flasher plugged the board via usb, it is recognized perfectly and driver installed, then downloaded firmware nodemcu_float_0.9.6-dev_20150406.bin from https://github.com/nodemcu/nodemcu-firmware/releases. Launched the flasher and chose the bin and it was flashed.

Immediately after flashing, the USB port on the computer starts beeping on and off as if a device is plugged in and out of the USB port. Any connection to the device over USB serial fails.

Now, I open ESplorer after the beeping stops and I get
----------------------------------------------------
Communication with MCU...
Got answer! AutoDetect firmware...

Can't autodetect firmware, because proper answer not received.
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The nodemcu-flasher cannot program the board anymore as well.

However, wifi works and I can see ESP_95BD50 access point and can connect to it and get an IP address and ping it at 192.168.4.1. So, the thing is working but any attempt to connect over USB serial fails.

I tried on other computer and also on Linux and all failed. On linux when the board is connected nothing appears on /dev/ttyUSB0.

This is totally crazy, I cannot tell what is going on. Can someone help me know what the problem is.

- Mon Apr 13, 2015 3:18 am #14345 What a senseless waste of time. It was the usb cable!!! But could it be ruined after programming the nodemcu dev board?? Now it works with the new cable but I am kind of paranoid of programming flashing it again. I will do all the lua code experiments first