Adafruit Feather Huzzah ESP8266 pull-up resistor using Arduino IDE -


i working on adafruit feather huzzah esp8266 , add internal pull-up push button. when pull-up manually resistor, wiring works when add internal pull-up using following line in arduino ide code, not work properly.

pinmode(bouton,input_pullup)

here full code: 

const int led = 13;  const int bouton = 16;   void setup()  {     pinmode(led, output);      pinmode(bouton, input); }  void loop() {     int etat = digitalread(bouton);     if(etat==low)     {         digitalwrite(led, high);      }     else       {         digitalwrite(led, low);     } }

here wiring pull-up:

here wiring supposed internal pull-up:

when writing program, had erroneously assumed gpio16 had pullup resistor. not.

at startup, pins configured input.

gpio0-gpio15 can input, output, or input_pullup. gpio16 can input, output, or input_pulldown_16. xpd deepsleep() (perhaps via small capacitor.)

note gpio6-gpio11 typically used interface flash memory ics on esp8266 modules, these pins should not used.

reference: http://www.esp8266.com/wiki/doku.php?id=esp8266_gpio_pin_allocations


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