- Wed Jun 28, 2017 9:47 am
#67686
You can measure if the FLASH-button is still working, by connecting a multimeter between pin D3 (GPIO0) and a G-pin (GND).
Alternatively measure directly on the ESP chip (don't touch its metal can) itself, connecting between the top rightmost pin and the fourth pin from the right:
Set your multimeter to the 20k-ohm (or higher) range.
If the FLASH-button is
not pressed, you should read a value of about 11.5k, when pressed it should drop down to (nearly) 0 ohm (in my case it was around 500 Ohm, so I couldn't use the continuity-setting on my meter).
If the switch isn't working or you want to make sure your ESP is in the flashing mode at reset, you can attach a jumper cable/Dupont wire between pin D3 of the NodeMCU board and GND.
Press the RESET-button and detach one end of the wire; this *should* get you into flash-mode.
Assumption is the mother of all f*ckups. At least: that's what I'm assuming.