Fastest Finger First

1// Paul Brace
2// 8 Jan 2021
3
4// fastest finger first
5// 3
6  buttons - first one pressed lights their light and hears their tone
7// Reset
8  button flashes all lights twice (proves they are working)
9// then waits.
10
11int
12  redButton = 1;
13int greenButton = 2;
14int amberButton = 3;
15int redLED = 4;
16int
17  greenLED = 5;
18int amberLED = 6;
19int buzzer = 7;
20int resetButton = 8;
21bool
22  waiting = false;
23int redNote = 262; 
24int greenNote = 523; 
25int amberNote
26  = 1047; 
27int duration = 250;
28
29void setup() {
30  pinMode(redButton, INPUT_PULLUP);
31
32  pinMode(greenButton, INPUT_PULLUP);
33  pinMode(amberButton, INPUT_PULLUP);
34
35  pinMode(resetButton, INPUT_PULLUP);
36  pinMode(redLED, OUTPUT);
37  pinMode(greenLED,
38  OUTPUT);
39  pinMode(amberLED, OUTPUT);
40  pinMode(buzzer, OUTPUT);
41  // Flash
42  4 times (each call flashes twice) to show ready
43  for (int i = 0; i < 2; i++)
44  {
45    FlashLEDs();
46  }
47}
48
49void FlashLEDs() {
50  for (int i = 0;
51  i < 2; i++){
52    digitalWrite(redLED, HIGH);
53    digitalWrite(greenLED, HIGH);
54
55    digitalWrite(amberLED, HIGH);
56    delay(500);
57    digitalWrite(redLED,
58  LOW);
59    digitalWrite(greenLED, LOW);
60    digitalWrite(amberLED, LOW);
61
62    delay(500);
63  }
64  waiting = true;
65}
66
67bool checkButtons(){
68
69  // Check to see if a button has been pressed
70  // If there is a dead heat (very
71  unlikely) both lights will show
72  bool pressed = false;
73  if (digitalRead(amberButton)
74  == LOW){
75    digitalWrite(amberLED, HIGH);
76    tone(buzzer, amberNote, duration);
77
78    pressed = true;
79  }
80  if (digitalRead(redButton) == LOW){
81    digitalWrite(redLED,
82  HIGH);
83    tone(buzzer, redNote, duration);
84    pressed = true;
85  }
86
87  if (digitalRead(greenButton) == LOW){
88    digitalWrite(greenLED, HIGH);
89
90    tone(buzzer, greenNote, duration);
91    pressed = true;
92  }
93  return(pressed);
94}
95
96void
97  loop() {
98  if (digitalRead(resetButton) == LOW)
99  {
100    FlashLEDs();
101
102  }
103  if (waiting){
104    waiting = !checkButtons();
105  }
106}
107