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

User avatar
By tipo1000
#78548 Hello,

I'm asking about these 3 GPIO's because they are used in bootstrapping.

Is there any limitations in using these pins for general input/output after startup condition has been passed?

For example: If I want to drive buzzer, drive LED or read button with these GPIO's.

User avatar
By QuickFix
#78595 With the information found in our Wiki, you should be able to find any limitations with the GPIO-pins of the ESP8266. :idea:

In short: don't assume that GPIO0, GPIO2 and GPIO15 are just like the other GPIO's.
As input, make sure they're properly pulled up or down and as output make sure anything connected (like a buzzer) influences the port at boot (at which time they act as input).