Added button and LED based edition of Passkey.

Digispark_Passkey3/Digispark_Passkey3.ino

@@ -0,0 +1,109 @@
+// Passkey for Arduino using the Digispark Rev.3 board.
+// Copyright 2022 by Johannes Findeisen <you@hanez.org>
+// Licensed under the terms of the MIT license.
+
+// For using the Blinker library you have to install it from:
+// https://github.com/MajenkoLibraries/Blinker
+// Since the code is included in Passkey you easily can just copy
+// Blinker/src/Blinker.cpp and Blinker/src/Blinker.h to the root of 
+// Passkey.
+#include "Blinker.h"
+#include "DigiKeyboard.h"
+
+// The button pin
+#define BUTTON_PIN 0
+// The LED pin
+#define LED_PIN 1
+// The pause after last button press before executing a command
+#define PAUSE 2000
+
+// Local variables
+unsigned long last;
+unsigned int count;
+
+// Create blinker object
+Blinker blinker(LED_PIN);
+
+// The list of available passwords
+// The number and overall lenght of passwords depends 
+// because the memory of the digispark is very limited...
+// I recommend to use a prefix you easily can remember 
+// for the password/passwords to make the passwords
+// on the passkey unusable for others in case you've lost 
+// your passkey. E.g.: WhatAWonderfulWorld -> then press the button.
+const char *passwords[] = {
+  // passwords[0]
+  "n0Emb871NAQPSIqBoldh8R7UDaNhncF7Pt60Amdo6GWdTdAPwVBi2A3KU8x8DTCRo6GWdTdXNn2wLh3SUbxVWQvFDVPtatDg",
+  // passwords[1]
+  "oaxt6e3lSgflOuJ3C6Q6sUb5gvmvI5IEPFku5fqcbxJljBOUblHIT121wCu",
+  // passwords[2]
+  "jUgKGBtiJ0iNN1Ok9vejrXNn2wLh3SUbxVWQvFDVPtat0OxJlKU8x8DTCRo6GWdTdAPwVBi2A3KUrTKQwjUgK",
+  // passwords[3]
+  "G57dFnXsPUnRq1eC1CjrGxpCjuiJFlDti54W6wBS9Ro6GWdTdAPwVBi2A3KU8x8KGBtiJ0iNN1Ok9vejrXNn2wLhH" 
+};
+
+void setup() {
+  // Set button pin to high.
+  pinMode(BUTTON_PIN, INPUT);
+  // Set BUTTON_PIN pin to high because the button is connected 
+  // to GND when pressed and will go LOW
+  digitalWrite(BUTTON_PIN, HIGH);
+
+  // Set blink effect (ON, OFF) in milliseconds
+  blinker.setDelay(25, 9075);
+  blinker.start();
+
+  // Initialize HID
+  DigiKeyboard.delay(0);
+  DigiKeyboard.sendKeyStroke(0);
+
+  // Light up the LED for a second to show that passkey is ready
+  pinMode(LED_PIN, OUTPUT);
+  digitalWrite(LED_PIN, HIGH);
+  delay(1000);
+  digitalWrite(LED_PIN, LOW);
+}
+
+void loop() {
+  // Start LED blink effect
+  blinker.blink();
+
+  // Read button state
+  if (digitalRead(BUTTON_PIN) == LOW) {
+    // Button is pressed
+    count++;
+    digitalWrite(LED_PIN, HIGH);
+    // Wait until button is released
+    while (digitalRead(BUTTON_PIN) == LOW) {
+      delay(1);
+    }
+    // Set the last press timestamp
+    last = millis();
+    digitalWrite(LED_PIN, LOW);
+  }
+
+  // Wait PAUSE time before executing a command
+  if (count > 0 && (millis() - last) >= PAUSE) {
+    // The switch case is the number of button presses
+    switch (count) {
+      case 1:
+        DigiKeyboard.println(passwords[0]);
+        break;
+      case 2:
+        DigiKeyboard.println(passwords[1]);
+        break;
+      case 3:
+        DigiKeyboard.println(passwords[2]);
+        break;
+      case 5:
+        // You can use print instead of println if you don't want 
+        // to hit enter automatically after inserting the password
+        DigiKeyboard.print(passwords[3]);
+        break;
+      default:
+        break;
+    }
+    // Reset the counter
+    count = 0;
+  }
+}