Button Function Fires repeatedly but no button was pushed

hey all,
i'm working huzzah feather , usual can pieces work not whole.  button function keeps firing despite no button pushes.

i've wired capacitive touch button , loaded arduino debounce example sketch , works intended.

i'm using mqtt send data , io.adafruit.com.  i've set couple of feeds , can toggle pins on board io.adafruit.com, super cool! 

when add button function code works keeps firing on , over.  how can write executes when button pressed?

code: [select]


#include "config.h"

#define led_pin 5

const int button_pin = 16;    // number of pushbutton pin

int ledstate = low;         // current state of output pin
int buttonstate;             // current reading input pin
int lastbuttonstate = low;   // previous reading input pin

long lastdebouncetime = 0;  // last time output pin toggled
long debouncedelay = 50;    // debounce time; increase if output flickers

adafruitio_feed *digital = io.feed("digital");

void handlemessage(adafruitio_data *data) {

  serial.print("received digital feed <- ");

  if (data->topinlevel() == high)
    serial.println("high");
  else
    serial.println("low");

  // write current state led
  digitalwrite(led_pin, data->topinlevel());

}

void button() {
  int reading = digitalread(button_pin);

  if (reading != lastbuttonstate) {
    lastdebouncetime = millis();
  }

  if ((millis() - lastdebouncetime) > debouncedelay) {

    if (reading != buttonstate) {
      buttonstate = reading;

      if (buttonstate == high) {
        ledstate = !ledstate;
      }
    }
  }
  lastbuttonstate = reading;

  serial.print("digital pin status"); serial.println(ledstate);

  digitalwrite(led_pin, ledstate);

  digital->save(ledstate);

}

void setup() {
  pinmode(button_pin, input);
  pinmode(led_pin, output);
  digitalwrite(led_pin, ledstate);

  serial.begin(115200);

  while (! serial);

  serial.print("connecting adafruit io");
  io.connect();

  digital->onmessage(handlemessage);

  while (io.status() < aio_connected) {
    serial.print(".");
    delay(500);
  }
  serial.println();
  serial.println(io.statustext());

}

void loop() {
  io.run();
 button();
}


thanks!
rich

how button wired ?

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