1  // SPDX-FileCopyrightText: 2020 Carter Nelson for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  ////////////////////////////////////////////////////////////////////////////
 6  // Circuit Playground Capacitive Touch Basic
 7  //
 8  // Print text messages for each touch pad.
 9  //
10  // Author: Carter Nelson
11  // MIT License (https://opensource.org/licenses/MIT)
12  
13  #include <Adafruit_CircuitPlayground.h>
14  
15  #define CAP_THRESHOLD   50
16  #define DEBOUNCE        250
17  
18  uint8_t pads[] = {3, 2, 0, 1, 12, 6, 9, 10};
19  uint8_t numberOfPads = sizeof(pads)/sizeof(uint8_t);
20  
21  ////////////////////////////////////////////////////////////////////////////
22  void takeAction(uint8_t pad) {
23    Serial.print("PAD "); Serial.print(pad); Serial.print(" says: ");
24    switch (pad) {
25      case 3:
26        Serial.println("The goggles! They do nothing!");
27        break;
28      case 2:
29        Serial.println("Dental plan!");
30        break;
31      case 0:
32        Serial.println("Lisa needs braces.");
33        break;
34      case 1:
35        Serial.println("I call the large one Bitey.");
36        break;
37      case 12:
38        Serial.println("I'm Idaho!");
39        break;
40      case 6:
41        Serial.println("Monorail!");
42        break;
43      case 9:
44        Serial.println("I choo-choo choose you.");
45        break;
46      case 10:
47        Serial.println("Maaaattlllock!");
48        break;
49      default:
50        Serial.println("THIS SHOULD NEVER HAPPEN.");
51    }
52  }
53  
54  ////////////////////////////////////////////////////////////////////////////
55  boolean capButton(uint8_t pad) {
56    // Check if capacitive touch exceeds threshold.
57    if (CircuitPlayground.readCap(pad) > CAP_THRESHOLD) {
58      return true;  
59    } else {
60      return false;
61    }
62  }
63  
64  ////////////////////////////////////////////////////////////////////////////
65  void setup() {
66    // Initialize serial.
67    Serial.begin(9600); 
68    
69    // Initialize Circuit Playground library.
70    CircuitPlayground.begin();
71  }
72  
73  ////////////////////////////////////////////////////////////////////////////
74  void loop() {
75    // Loop over every pad.
76    for (int i=0; i<numberOfPads; i++) {
77      
78      // Check if pad is touched.
79      if (capButton(pads[i])) {
80        
81        // Do something.
82        takeAction(pads[i]);
83        
84        // But not too often.
85        delay(DEBOUNCE);
86      }
87    }
88  }