1  // SPDX-FileCopyrightText: 2019 Tony DiCola for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  // Example of buttons generating keyboard presses
 6  // Author: Tony DiCola
 7  // License: MIT
 8  #include <Keyboard.h>
 9  
10  
11  #define BUTTON1_PIN  10                // Pin connected to button 1.
12  
13  #define BUTTON2_PIN  12                // Pin connected to button 2.
14  
15  #define BUTTON1_KEY  KEY_UP_ARROW      // Keyboard key generated by button 1 press.
16                                         // See all the key values here:
17                                         //   https://www.arduino.cc/en/Reference/KeyboardModifiers
18  
19  #define BUTTON2_KEY  KEY_DOWN_ARROW    // Keyboard key generated by button 2 press.
20  
21  
22  void setup() {
23    // Configure button inputs with a pullup resistor so they
24    // default to a high level and are pulled down to ground
25    // when pressed.
26    pinMode(BUTTON1_PIN, INPUT_PULLUP);
27    pinMode(BUTTON2_PIN, INPUT_PULLUP);
28    // Initialize keyboard library.
29    Keyboard.begin();
30  }
31  
32  void loop() {
33    // Look for the transition from high to low (button pressed)
34    // or low to high (button released) to press and release keys.
35    // Do this by taking an initial reading, waiting a tiny bit
36    // and then taking another reading.  If there's a transition
37    // we can detect the change between readings.  This also acts
38    // to 'debouce' and prevent multiple transitions.
39    int button1_first = digitalRead(BUTTON1_PIN);
40    int button2_first = digitalRead(BUTTON2_PIN);
41    delay(10);
42    int button1_second = digitalRead(BUTTON1_PIN);
43    int button2_second = digitalRead(BUTTON2_PIN);
44    // Check for button transitions.
45    if (button1_first == HIGH && button1_second == LOW) {
46      // Button 1 was pressed.
47      Keyboard.press(BUTTON1_KEY);
48    }
49    else if (button1_first == LOW && button1_second == HIGH) {
50      // Button 1 was released.
51      Keyboard.release(BUTTON1_KEY);
52    }
53    if (button2_first == HIGH && button2_second == LOW) {
54      // Button 2 was pressed.
55      Keyboard.press(BUTTON2_KEY);
56    }
57    else if (button2_first == LOW && button2_second == HIGH) {
58      // Button 1 was released.
59      Keyboard.release(BUTTON2_KEY);
60    }
61  }
62