Hello All,
I am facing identical error messages on NodeMCU board ESP-12 V1.0.
I started with 2 NodeMCU boards. Both were working normally for more than a month on different PCs running XP, Windows 7 and Windows 10.
Today I was making one as a UDP server and other as a UDP client and effecting simple data transfer. It worked for about 2 hours.
I was connecting the pin D0 to an external active buzzer (feeding it to base of transistor BC547 driving the buzzer) so that it would sound a ping whenever new packet arrived.
After I connected buzzer, suddenly one of the boards showed this error while uploading the sketch. After that it would not upload even the blink sketch. I tried UPLOADING ON different computers, WITH different usb cables but the board refuses to communicate with IDE.
1. Funnily, whatever last code was burnt into it, is still working fine and the serial messages are seen on Serial Monitor or HyperTerminal. That means that onboard serial to USB conversion is and USB driver and functioning well.
2. On the same PC and same setup, another board is uploading all the sketch perfectly so IDE and driver seem to be OK.
3. I connected external 5V and GND to VIN and GND and repeated the procedure but still get teh same error.
It is just that it is not allowing any more sketch uploading.
Is it possible to rescue the board or should I just junk it?
Thanks in advance..
-Prakash W Dandekar