ESP8266 Community Forum

j0hncc wrote:Doesn't that LED plus resistor on GPIO02 cause the unit to boot in the wrong mode?

Yes, they should go to Vcc, not to GND.

Thanks for the comments.

It is not my layout, it is taken from the posting with link above the diagram.

Just learned that GPIO2 is related to boot mode, and needs to be pulled high:
http://www.esp8266.com/viewtopic.php?f=13&t=1730&start=10

Is that only true for EDP8266-12, or for ESP8266-01 as well?

Both devices work fine for me (flashing and running) without GPIO2 connected at all ...

Hermann.

HermannSW wrote:Just learned that GPIO2 is related to boot mode, and needs to be pulled high:
http://www.esp8266.com/viewtopic.php?f=13&t=1730&start=10

Is that only true for EDP8266-12, or for ESP8266-01 as well?

Both devices work fine for me (flashing and running) without GPIO2 connected at all ...

I usually leave GPIO2 floating as well. I think it has an internal pullup. So it's enough that you don't pull it to ground.