ESP8266 Community Forum

- Wed Aug 29, 2018 2:17 pm #78000 Per the wemos.cc
"all pins have interrupt/pwm/I2C/one-wire supported(except D0)"

What is it that precludes D0?

Is that a limitation of the esp8266 chip itself (gpio16)? Or is it a limitation of the Wemos circuitry surrounding it.

Thanks,
John

- Wed Aug 29, 2018 2:19 pm #78001

Is that a limitation of the esp8266 chip itself (gpio16)?

Yes. That port pin is different electrically than all the others.

- Thu Aug 30, 2018 2:36 am #78011 ...presumably because GPIO16 is used with deep sleep, so the hardware behind it has to be a bit different from the rest I guess.

For more nice GPIO-facts and figures, see the Wiki.

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.