ESP8266 Community Forum

- Mon Jun 13, 2016 6:22 pm #49149 From what I see on the Huzzah schematic is there is no PullUp on GPIO0 and they seems to rely on the fact they placed an LED on it along with the boot switch.
https://learn.adafruit.com/adafruit-huz ... /downloads
To my opinion, this is badly designed, since the LED won't act as a PullUp until it start conducting, and even then, the drop voltage across this LED will prevent having a "good" HIGH level on GPIO0.
Therefore, you should try to add yourself a PullUp resistor in parallel to the whole LED circuit and provide us your experiments results again.

EDIT : what is also strange, is that bad behaviour about improper boot mode, should always occur, not only in OTA context.

- Mon Jun 13, 2016 7:27 pm #49153 Thanks, the resistor did the trick. I have had it happen very rarely with the serial meathod, but it happened every time with the OTA method. Now i can upload without having to press buttons.

Thanks!

- Mon Jun 13, 2016 7:50 pm #49154 Very Good !
Glad we got it narrowed !
You should maybe email a small complain to LadyAda, and provide her the link to my post, explaining that she should add the same PullUp on next revision of Huzzah PCB ...

- Mon Jan 08, 2018 6:03 pm #72981 Sorry to dig this up but I'm trying to OTA update some Huzzah breakouts and think this is my problem. Could you outline where you are connecting the pull up resistor?

Thanks!