ESP8266 Community Forum

- Fri Apr 15, 2016 11:37 pm #45564 Hello all,

I'm currently having issues getting pin 16 to work with the neopixel library, and in fact I can't seem to get pin 16 to do anything... It seems to be able to be hooked up to rst for sleep functions, but I can't find anything about needing to do anything fancy to use it normally? Am I missing something obvous?

I'm using an esp12e with the arduino ide.

Cheers

Sol

- Sat Apr 16, 2016 2:57 am #45572 gpio16 is a little bit different as it has an internal pulldown resistor.
depending on the pin-setup and your hw you may need an external pullup.

or maybe it is just because, as the espressiv doc says, it is not a standard API GPIO :

Code: Select all2.5. GPIO16 related APIs Different from other IO interfaces, GPIO16(XPD_DCDC) belongs to the RTC module instead of the general GPIO module. It can be used to wake up the chip during deep-sleep; it can be configured to input or output mode; but it cannot trigger the IO interrupt. the APIs are shown below.

2.5.1. gpio16_output_conf(void)
Set the GPIO16 to the output mode.

2.5.2.gpio16_output_set(uint8 value)
Output high/low level from GPIO16. Configure GPIO16 to the output mode first.

2.5.3.gpio16_input_conf(void)
Set the GPIO16 to the input mode.

2.5.4.gpio16_input_get(void)
Read the GPIO16 input level status. Configure GPIO16 to the input mode first.