Adafruit Trinket as an 'Enter' button

Industrial E-Stop Button

I am using Adafruit's Trinket to create a simple HID keyboard 'Enter' button. I started by using the example sketch "TrinketKeyboardExample" and modifying it. The button is actually an emergency stop button with a normally closed switch.

This is the original code "TrinketKeyboardExample":

 /*  
 TrinketKeyboard example  
 For Trinket by Adafruit Industries  
 */  
 #include <TrinketKeyboard.h>  
 #define PIN_BUTTON_CAPITAL_A 0  
 #define PIN_BUTTON_STRING  2  
 void setup()  
 {  
  // button pins as inputs  
  pinMode(PIN_BUTTON_CAPITAL_A, INPUT);  
  pinMode(PIN_BUTTON_STRING, INPUT);  
  // setting input pins to high means turning on internal pull-up resistors  
  digitalWrite(PIN_BUTTON_CAPITAL_A, HIGH);  
  digitalWrite(PIN_BUTTON_STRING, HIGH);  
  // remember, the buttons are active-low, they read LOW when they are not pressed  
  // start USB stuff  
  TrinketKeyboard.begin();  
 }  
 void loop()  
 {  
  TrinketKeyboard.poll();  
  // the poll function must be called at least once every 10 ms  
  // or cause a keystroke  
  // if it is not, then the computer may think that the device  
  // has stopped working, and give errors  
  if (digitalRead(PIN_BUTTON_CAPITAL_A) == LOW)  
  {  
   TrinketKeyboard.pressKey(KEYCODE_MOD_LEFT_SHIFT, KEYCODE_A);  
   // this should type a capital A  
   TrinketKeyboard.pressKey(0, 0);  
   // this releases the key  
  }  
  if (digitalRead(PIN_BUTTON_STRING) == LOW)  
  {  
   // type out a string using the Print class  
   TrinketKeyboard.print("Hello World!");  
  }  
 }  

Here is my modified code:

 /*  
 TrinketKeyboard example  
 For Trinket by Adafruit Industries
 Modified by PlatinumFusion

 */  
 #include <Bounce.h>  
 #include <TrinketKeyboard.h>  
 //#define button0 0  
 #define PIN_BUTTON_STRING  2  
 Bounce button0 = Bounce(0, 10);  
 void setup()  
 {  
  // button pins as inputs  
  pinMode(0, INPUT_PULLUP);  
  // setting input pins to high means turning on internal pull-up resistors  
  digitalWrite(0, LOW);  
  // remember, the buttons are active-low, they read LOW when they are not pressed  
  // start USB stuff  
  TrinketKeyboard.begin();  
 }  
 void loop()  
 {  
  TrinketKeyboard.poll();  
  button0.update();  
  // the poll function must be called at least once every 10 ms  
  // or cause a keystroke  
  // if it is not, then the computer may think that the device  
  // has stopped working, and give errors  
  if (button0.risingEdge()) {  
   TrinketKeyboard.pressKey(0, KEYCODE_ENTER);  
   // this should be the 'Enter' key  
   TrinketKeyboard.pressKey(0, 0);  
  }  
 }  

 The button is attached to pin 0 and ground.

The completed project:

Testing the Button: