Arduino Tick-Tock Metronome

1#include <LiquidCrystal.h>
2
3// Pin setup
4const int potPin = A0;
5const int buzzerPin = 8;
6const int ledPin = 13;
7
8// LCD setup: (rs, enable, d4, d5, d6, d7)
9LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
10
11int mappedPotValue = 0;
12int beatCount = 0; // To keep track of beats (for tick-tock effect)
13
14void setup() {
15  Serial.begin(9600);
16  pinMode(ledPin, OUTPUT); // Set LED pin as output
17  
18  lcd.begin(16, 2);         // Initialize the 2x16 LCD
19  lcd.print("Metronome BPM:");
20}
21
22void loop() {
23  // Read the potentiometer
24  int rawPotValue = analogRead(potPin);
25
26  // Map the potentiometer to BPM (Beats Per Minute)
27  mappedPotValue = map(rawPotValue, 0, 1023, 42, 208);
28
29  // Calculate the beat interval (milliseconds per beat)
30  int beatInterval = 60000 / mappedPotValue;
31
32  // Debugging output
33  Serial.print("Raw Value: ");
34  Serial.println(rawPotValue);
35  Serial.print("Mapped BPM: ");
36  Serial.println(mappedPotValue);
37  Serial.print("Beat Interval (ms): ");
38  Serial.println(beatInterval);
39
40  // Update BPM on LCD
41  lcd.setCursor(0, 1);         // Second row
42  lcd.print("BPM: ");
43  lcd.print(mappedPotValue);
44  lcd.print("   ");            // Clear leftover digits
45
46  // Flash the LED ON
47  digitalWrite(ledPin, HIGH);
48
49  // Decide between "Tick" and "Tock"
50  if (beatCount % 4 == 0) {
51    // Every 4th beat is a "Tock" (higher tone)
52    tone(buzzerPin, 1025, 20);
53  } else {
54    // Other beats are "Tick" (lower tone)
55    tone(buzzerPin, 775, 20);
56  }
57
58  delay(50); // Keep LED ON during the beep (50ms)
59  
60  // Flash the LED OFF
61  digitalWrite(ledPin, LOW);
62
63  // Wait the rest of the beat time
64  delay(beatInterval - 50);
65
66  beatCount++; // Increase beat counter
67
68  // Optional: reset beatCount if it gets too big
69  if (beatCount > 1000) {
70    beatCount = 0;
71  }
72}