Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By HermannSW
#19539 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.
User avatar
By kenn
#19551
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.