Smart Glass Counter - A Step-by-Step Arduino Hydration Tracking Project

1// Pin assignments
2const int waterSensorPin = 2;
3const int irSensorPin = 3;
4const int buzzerPin = 8;
5
6// Variables
7int glassCount = 0;
8bool alreadyCounted = false; // Prevents double counting
9unsigned long lastReminderTime = 0;
10bool reminderActive = true;
11
12void setup() {
13  pinMode(waterSensorPin, INPUT);
14  pinMode(irSensorPin, INPUT);
15  pinMode(buzzerPin, OUTPUT);
16
17  Serial.begin(9600);
18
19  // Step 1: Power-on tone
20  powerOnTone();
21  delay(300);
22
23  // Step 2: Activation tone
24  activationTone();
25}
26
27void loop() {
28  int waterState = digitalRead(waterSensorPin); // HIGH if water present
29  int irState = digitalRead(irSensorPin);       // LOW if glass detected
30
31  Serial.print("Water: ");
32  Serial.print(waterState);
33  Serial.print(" | IR: ");
34  Serial.print(irState);
35  Serial.print(" | Count: ");
36  Serial.println(glassCount);
37
38  // Step 3: Reminder tone every 3s if active
39  if (reminderActive && millis() - lastReminderTime >= 3000) {
40    reminderTone();
41    lastReminderTime = millis();
42  }
43
44  // If glass detected, stop initial reminder
45  if (irState == LOW && !alreadyCounted) {
46    reminderActive = false;
47
48    Serial.println("Glass detected, waiting before check...");
49    delay(1000); // Settling time before starting the 3-second check
50
51    // Re-read sensors after settling
52    if (digitalRead(irSensorPin) == LOW) {
53      Serial.println("Starting 3-second empty check...");
54      bool cancelCount = false;
55
56      for (int i = 0; i < 3; i++) { // Check for 3 seconds
57        delay(1000);
58        if (digitalRead(waterSensorPin) == HIGH) {
59          Serial.println("Water detected — cancel count.");
60          cancelCount = true;
61          break;
62        }
63      }
64
65      if (!cancelCount && digitalRead(waterSensorPin) == LOW) {
66        glassCount++;
67        alreadyCounted = true;
68        Serial.print("✅ Glass counted! Total: ");
69        Serial.println(glassCount);
70        countTone();
71
72        // If water still not detected after counting, restart reminder
73        if (digitalRead(waterSensorPin) == LOW) {
74          reminderActive = true;
75          lastReminderTime = millis(); // Reset reminder timer
76        }
77
78        // Victory tone after 6 glasses
79        if (glassCount >= 6) {
80          victoryTone();
81          glassCount = 0; // Reset after victory
82          reminderActive = true; // Reactivate reminder after victory
83        }
84      }
85    }
86  }
87
88  // Reset counting permission when glass removed or water present
89  if (irState == HIGH || waterState == HIGH) {
90    alreadyCounted = false;
91  }
92
93  delay(100); // Small polling delay
94}
95
96// --------- Tone Functions ----------
97void powerOnTone() {
98  tone(buzzerPin, 500, 200);
99  delay(250);
100  tone(buzzerPin, 700, 200);
101  delay(250);
102  noTone(buzzerPin);
103}
104
105void activationTone() {
106  tone(buzzerPin, 1000, 200);
107  delay(250);
108  tone(buzzerPin, 1500, 200);
109  delay(250);
110  noTone(buzzerPin);
111}
112
113void reminderTone() {
114  tone(buzzerPin, 400, 150);
115  delay(150);
116  noTone(buzzerPin);
117}
118
119void countTone() {
120  tone(buzzerPin, 800, 200);
121  delay(250);
122  noTone(buzzerPin);
123}
124
125void victoryTone() {
126  tone(buzzerPin, 800, 150);
127  delay(200);
128  tone(buzzerPin, 1000, 150);
129  delay(200);
130  tone(buzzerPin, 1200, 200);
131  delay(250);
132  noTone(buzzerPin);
133}