yubikey

pow.gif

prototype0.jpg

yubikey.ino

#include "DigiKeyboard.h"

void setup() {
  pinMode(0, INPUT);
  pinMode(1, OUTPUT);
  //blink twice
  digitalWrite(1, HIGH);
  delay(100);
  digitalWrite(1, LOW);
  delay(100);
  digitalWrite(1, HIGH);
  delay(100);
  digitalWrite(1, LOW);
}

int s = 0;
int touch = 0;
int mode = 0;

void loop() {
  s = digitalRead(0);
  if (s != 0) {
    touch++;
    delay(10);
  } else {
    if (touch >= 3 && touch <= 100) {
      mode = 1;
      touch = 0;
    } else {
      mode = 0;
      touch = 0;
    }
  }
  if (touch > 100) {
    mode = 2;
    touch = 0;
  }
  if (mode == 1) {
    //blink once
    digitalWrite(1, HIGH);

    DigiKeyboard.sendKeyStroke(0);
    DigiKeyboard.println("Mode 1!");
    mode = 0;
    DigiKeyboard.delay(1000);
  } else if (mode == 2) {
    //blink twice
    digitalWrite(1, HIGH);
    delay(100);
    digitalWrite(1, LOW);
    delay(100);
    digitalWrite(1, HIGH);

    DigiKeyboard.sendKeyStroke(0);
    DigiKeyboard.println("Mode 2!");
    // wait until button released
    while (s != 0) {
      s = digitalRead(0);
    }
    mode = 0;
    DigiKeyboard.delay(1000);
  } else {
    digitalWrite(1, LOW);
  }
}

BOM:

Digispark
A touch button