ESP8266 Community Forum

- Mon Jul 04, 2016 4:19 pm #50199

Also, make sure your have RES/CH_PD pulled up, GPIO15 pulled down, and also GPIO2/GPIO0 pulled up.

Thanks martinayotte

All of this is OK on my side and my ESP12E is working quite well (except some watchdog resets but anyway)

Do you have any idea of what extra GPIO I should use as an INPUT then?
I'm still confused about how to dedicate a GPIO to only INPUT or OUTPUT stuff if I don't need any other functions such as SPI ...

- Mon Jul 04, 2016 5:23 pm #50204 Simply use pinMode(<gpio_no>, INPUT) or pinMode(<gpio_no>, OUTPUT).
Which one to choose ? That is depends if you already used some for something else or not, but lets says GPIO4 or GPIO5 for example.

- Tue Jul 05, 2016 3:01 am #50220

but lets says GPIO4 or GPIO5 for example.

GPIO4 and GPIO5 are already used as OUTPUT in my case.
I just needed another one as INPUT. I tried GPIO12 again and it seems to work now!! quit strange ...

By the way, I need to use this INPUT as a push button so I added a pull-up resistor and wired GPIO12 to the button.
I saw that it was possible on certain Socs to remove external pull-ups by activating internal ones.
Is it possible to use internal pull-ups with ESP8266 using Pinmode function?

- Tue Jul 05, 2016 3:37 am #50222 I tried with
pinMode(GPIO12, INPUT_PULLUP);
but it does not boot anymore
Nevermind, I'll use pinMode(GPIO12, INPUT) with an external pullup!