Forget-Me-Glass

1#include "ArduinoGraphics.h"
2#include "Arduino_LED_Matrix.h"
3
4ArduinoLEDMatrix matrix;
5
6const int irPin = 2;       // IR sensor input pin
7const int buzzerPin = 3;   // Buzzer output pin
8
9void setup() {
10  Serial.begin(115200);
11  matrix.begin();                // Start LED Matrix (built-in on R4 WiFi)
12  pinMode(irPin, INPUT);         // IR sensor as input
13  pinMode(buzzerPin, OUTPUT);    // Buzzer as output
14  digitalWrite(buzzerPin, LOW);  // Make sure buzzer starts off
15}
16
17void loop() {
18  if (digitalRead(irPin) == HIGH) {
19    // Glass is not present — show happy face
20    matrix.loadFrame(LEDMATRIX_EMOJI_HAPPY);
21    digitalWrite(buzzerPin, LOW); // Ensure buzzer is off
22    delay(100);
23  }
24
25  if (digitalRead(irPin) == LOW) {
26    // Glass is placed — start countdown
27    for (int count = 60; count >= 0; count--) {
28      if (digitalRead(irPin) == HIGH) break;  // Glass removed
29
30      matrix.beginDraw();
31      matrix.stroke(0xFFFFFFFF);
32      matrix.clear();
33      matrix.textFont(Font_5x7);
34      matrix.beginText(0, 1, 0xFFFFFF);
35      matrix.println(count);  // Show countdown
36      matrix.endText();
37      matrix.endDraw();
38
39      delay(1000);  // 1-second interval
40    }
41
42    // Countdown expired and glass is still there
43    while (digitalRead(irPin) == LOW) {
44      matrix.loadFrame(LEDMATRIX_EMOJI_BASIC);  // Show neutral/disappointed face
45      digitalWrite(buzzerPin, HIGH);            // Buzzer ON
46      delay(100);
47    }
48
49    digitalWrite(buzzerPin, LOW);  // Turn buzzer off once glass is removed
50  }
51}