ESP8266 Community Forum

- Sun Jan 17, 2016 9:19 am #39045 Hi all,

i programm, test and mount my nodemcu into my coffemaschine. everything seems to be perfekt. but on the live test the board hang up. after a while i found out that this happey evertime i power up the board. but when i connect i to usb an flash new code over arduino ide to the board it works perfekt to the moment i disconnect power after flashing and power up again. i have no idea why this happens. maybe somebody can help me ?

Cheers Chris

- Sun Jan 17, 2016 2:12 pm #39069 What are you doing with GPIO15/GPIO2/GPIO0 ?
If you leave the GPIO0 to GND at next power recylce, it get back into UpLoad firmware mode.
You need to bring that back to VCC thru pullup resistors (or leaving it floating if such pullups are already present on the board)

- Mon Jan 18, 2016 3:11 pm #39170 Hey martinayotte

Thats it! GPIO0 was the problem.. ist was used as an input. i just change the pin to 13 an everything works!

Thank you so much!