Hack Your Productivity with This Next-Level Arduino Hydration Device!

1//included the neccessary libraries like Wir.h Adafruit GFX.h AdafruitSSD1306
2#include <Wire.h>
3#include <Adafruit_GFX.h>
4#include <Adafruit_SSD1306.h>
5//Defined the size of the oled display 
6#define SCREEN_WIDTH 128
7#define SCREEN_HEIGHT 64
8#define OLED_RESET -1
9Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
10
11// Defined Pins
12#define CLK 2
13#define DT 3
14#define SW 4
15#define IR_SENSOR 5
16#define BUZZER 6
17
18int setTime = 1;
19int lastEncoderState;
20bool bottlePresent = false;
21bool timerRunning = false;
22bool inQuestion = false;
23bool sessionCompleted = false;
24bool waitingAfterDrink = false;
25
26unsigned long timerStart = 0;
27unsigned long timerDuration = 0;
28unsigned long timeRemaining = 0;
29
30int menuOption = 0;
31
32// --- Paste your 128x64 bitmap below ---
33const unsigned char myBitmap [] PROGMEM = {
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98};
99
100void setup() {
101  Serial.begin(9600);
102
103  pinMode(CLK, INPUT);
104  pinMode(DT, INPUT);
105  pinMode(SW, INPUT_PULLUP);
106  pinMode(IR_SENSOR, INPUT);
107  pinMode(BUZZER, OUTPUT);
108  digitalWrite(BUZZER, LOW);
109
110  lastEncoderState = digitalRead(CLK);
111
112  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
113    Serial.println(F("OLED init failed"));
114    while (1);
115  }
116
117  display.clearDisplay();
118  display.drawBitmap(0, 0, myBitmap, 128, 64, SSD1306_WHITE);
119  display.display();
120  delay(2000);
121
122  displayMultiLine("Please", "place your", "water", "bottle");
123}
124
125void loop() {
126  int irStatus = digitalRead(IR_SENSOR);
127
128  if (inQuestion) {
129    handleQuestionMenu();
130    return;
131  }
132
133  if (irStatus == LOW) {  // Bottle placed
134    if (!bottlePresent) {
135      bottlePresent = true;
136      beep(); // ✅ Beep on bottle placed
137      Serial.println("[INFO] Bottle placed.");
138
139      if (!timerRunning && timeRemaining > 0) {
140        Serial.println("[INFO] Resuming paused timer...");
141        timerStart = millis();
142        timerDuration = timeRemaining;
143        timerRunning = true;
144        timeRemaining = 0;
145      } else if (!timerRunning && timeRemaining == 0) {
146        if (waitingAfterDrink) {
147          Serial.println("[INFO] Restarting timer after drinking...");
148          timerDuration = setTime * 60 * 1000UL;
149          timerStart = millis();
150          timerRunning = true;
151          waitingAfterDrink = false;
152          sessionCompleted = false;
153        } else if (!sessionCompleted) {
154          displayTimer(setTime);
155        }
156      }
157    }
158
159    if (!timerRunning) {
160      handleEncoder();
161
162      if (digitalRead(SW) == LOW) {
163        timerDuration = setTime * 60 * 1000UL;
164        timerStart = millis();
165        timerRunning = true;
166        sessionCompleted = false;
167        Serial.print("[INFO] Timer started: ");
168        Serial.print(setTime);
169        Serial.println(" minutes");
170        delay(500);
171      }
172
173    } else {
174      unsigned long elapsed = millis() - timerStart;
175
176      if (elapsed >= timerDuration) {
177        Serial.println("[INFO] Drinking Time!");
178
179        for (int i = 0; i < 3; i++) {
180          beep();
181          delay(200);
182        }
183
184        displayMessage("Drinking\nTime ", 2);
185
186        while (digitalRead(IR_SENSOR) == LOW) {
187          delay(100);
188        }
189
190        timerRunning = false;
191        sessionCompleted = true;
192        waitingAfterDrink = true;
193        displayMultiLine("Please", "place your", "water", "bottle");
194        bottlePresent = false;
195      } else {
196        unsigned long remaining = (timerDuration - elapsed) / 1000;
197        int min = remaining / 60;
198        int sec = remaining % 60;
199        char buf[20];
200        sprintf(buf, "%02d:%02d", min, sec);
201        displayMessage(String("Next sip in:\n") + buf, 2);
202        Serial.print("[INFO] Time left: ");
203        Serial.println(buf);
204        delay(1000);
205      }
206    }
207
208  } else { // Bottle removed
209    if (bottlePresent && timerRunning) {
210      timeRemaining = timerDuration - (millis() - timerStart);
211      timerRunning = false;
212      inQuestion = true;
213      menuOption = 0;
214      displayQuestionMenu();
215      Serial.println("[INFO] Bottle removed during timer. Asking reason...");
216    }
217
218    if (!bottlePresent) {
219      displayMultiLine("Please", "place your", "water", "bottle");
220    }
221
222    bottlePresent = false;
223  }
224}
225
226// ------------------ Question Menu ------------------
227void handleQuestionMenu() {
228  int currentState = digitalRead(CLK);
229  if (currentState != lastEncoderState) {
230    if (digitalRead(DT) != currentState) {
231      menuOption++;
232    } else {
233      menuOption--;
234    }
235    menuOption = constrain(menuOption, 0, 1);
236    displayQuestionMenu();
237    delay(100);
238  }
239  lastEncoderState = currentState;
240
241  if (digitalRead(SW) == LOW) {
242    delay(300);
243    Serial.println(menuOption == 0 ? "[SELECTED] Bottle Fell" : "[SELECTED] Drank Water");
244    displayMultiLine("Resume", "when", "bottle is", "placed");
245    waitForBottleReplacement(menuOption == 0);
246    inQuestion = false;
247  }
248}
249
250void displayQuestionMenu() {
251  display.clearDisplay();
252  display.setTextSize(1);
253  display.setTextColor(SSD1306_WHITE);
254  display.setCursor(0, 0);
255  display.println("Why removed?");
256  display.setCursor(0, 20);
257  if (menuOption == 0) display.print("> ");
258  else display.print("  ");
259  display.println("Bottle fell");
260  display.setCursor(0, 35);
261  if (menuOption == 1) display.print("> ");
262  else display.print("  ");
263  display.println("I drank water");
264  display.display();
265}
266
267// ------------------ Helper Functions ------------------
268void handleEncoder() {
269  int currentState = digitalRead(CLK);
270  if (currentState != lastEncoderState) {
271    if (digitalRead(DT) != currentState) {
272      setTime++;
273    } else {
274      setTime--;
275    }
276    setTime = constrain(setTime, 1, 20);
277    beep();
278    displayTimer(setTime);
279    delay(100);
280  }
281  lastEncoderState = currentState;
282}
283
284void beep() {
285  digitalWrite(BUZZER, HIGH);
286  delay(50);
287  digitalWrite(BUZZER, LOW);
288}
289
290void displayMessage(String msg, int textSize) {
291  display.clearDisplay();
292  display.setTextSize(textSize);
293  display.setTextColor(SSD1306_WHITE);
294  display.setCursor(0, 0);
295  display.println(msg);
296  display.display();
297}
298
299void displayTimer(int time) {
300  display.clearDisplay();
301  display.setTextSize(2);
302  display.setTextColor(SSD1306_WHITE);
303  display.setCursor(0, 0);
304  display.println("Set Time:");
305  display.setTextSize(3);
306  display.setCursor(20, 30);
307  display.print(time);
308  display.println(" min");
309  display.display();
310}
311
312void displayMultiLine(String l1, String l2, String l3, String l4) {
313  display.clearDisplay();
314  display.setTextSize(2);
315  display.setTextColor(SSD1306_WHITE);
316  display.setCursor(0, 0);
317  display.println(l1);
318  display.println(l2);
319  display.println(l3);
320  display.println(l4);
321  display.display();
322}
323
324void waitForBottleRemoval() {
325  while (digitalRead(IR_SENSOR) == LOW) delay(100);
326  while (digitalRead(IR_SENSOR) == HIGH) delay(100);
327}
328
329void waitForBottleReplacement(bool resumePrevious) {
330  while (digitalRead(IR_SENSOR) == HIGH) delay(100);
331
332  if (resumePrevious) {
333    timerStart = millis();
334    timerDuration = timeRemaining;
335    Serial.print("[INFO] Resuming from: ");
336    Serial.print(timerDuration / 1000);
337    Serial.println(" seconds");
338  } else {
339    timerStart = millis();
340    timerDuration = setTime * 60 * 1000UL;
341    Serial.println("[INFO] Starting new timer.");
342  }
343
344  timerRunning = true;
345  timeRemaining = 0;
346}
347
348void loop(){
349  digitalWrite(10,HIGH);
350  dleay(1000);
351}

//included the neccessary libraries like Wir.h Adafruit GFX.h AdafruitSSD1306
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
//Defined the size of the oled display 
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Defined Pins
#define CLK 2
#define DT 3
#define SW 4
#define IR_SENSOR 5
#define BUZZER 6

int setTime = 1;
int lastEncoderState;
bool bottlePresent = false;
bool timerRunning = false;
bool inQuestion = false;
bool sessionCompleted = false;
bool waitingAfterDrink = false;

unsigned long timerStart = 0;
unsigned long timerDuration = 0;
unsigned long timeRemaining = 0;

int menuOption = 0;

// --- Paste your 128x64 bitmap below ---
const unsigned char myBitmap [] PROGMEM = {
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};

void setup() {
  Serial.begin(9600);

  pinMode(CLK, INPUT);
  pinMode(DT, INPUT);
  pinMode(SW, INPUT_PULLUP);
  pinMode(IR_SENSOR, INPUT);
  pinMode(BUZZER, OUTPUT);
  digitalWrite(BUZZER, LOW);

  lastEncoderState = digitalRead(CLK);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("OLED init failed"));
    while (1);
  }

  display.clearDisplay();
  display.drawBitmap(0, 0, myBitmap, 128, 64, SSD1306_WHITE);
  display.display();
  delay(2000);

  displayMultiLine("Please", "place your", "water", "bottle");
}

void loop() {
  int irStatus = digitalRead(IR_SENSOR);

  if (inQuestion) {
    handleQuestionMenu();
    return;
  }

  if (irStatus == LOW) {  // Bottle placed
    if (!bottlePresent) {
      bottlePresent = true;
      beep(); // ✅ Beep on bottle placed
      Serial.println("[INFO] Bottle placed.");

      if (!timerRunning && timeRemaining > 0) {
        Serial.println("[INFO] Resuming paused timer...");
        timerStart = millis();
        timerDuration = timeRemaining;
        timerRunning = true;
        timeRemaining = 0;
      } else if (!timerRunning && timeRemaining == 0) {
        if (waitingAfterDrink) {
          Serial.println("[INFO] Restarting timer after drinking...");
          timerDuration = setTime * 60 * 1000UL;
          timerStart = millis();
          timerRunning = true;
          waitingAfterDrink = false;
          sessionCompleted = false;
        } else if (!sessionCompleted) {
          displayTimer(setTime);
        }
      }
    }

    if (!timerRunning) {
      handleEncoder();

      if (digitalRead(SW) == LOW) {
        timerDuration = setTime * 60 * 1000UL;
        timerStart = millis();
        timerRunning = true;
        sessionCompleted = false;
        Serial.print("[INFO] Timer started: ");
        Serial.print(setTime);
        Serial.println(" minutes");
        delay(500);
      }

    } else {
      unsigned long elapsed = millis() - timerStart;

      if (elapsed >= timerDuration) {
        Serial.println("[INFO] Drinking Time!");

        for (int i = 0; i < 3; i++) {
          beep();
          delay(200);
        }

        displayMessage("Drinking\nTime ", 2);

        while (digitalRead(IR_SENSOR) == LOW) {
          delay(100);
        }

        timerRunning = false;
        sessionCompleted = true;
        waitingAfterDrink = true;
        displayMultiLine("Please", "place your", "water", "bottle");
        bottlePresent = false;
      } else {
        unsigned long remaining = (timerDuration - elapsed) / 1000;
        int min = remaining / 60;
        int sec = remaining % 60;
        char buf[20];
        sprintf(buf, "%02d:%02d", min, sec);
        displayMessage(String("Next sip in:\n") + buf, 2);
        Serial.print("[INFO] Time left: ");
        Serial.println(buf);
        delay(1000);
      }
    }

  } else { // Bottle removed
    if (bottlePresent && timerRunning) {
      timeRemaining = timerDuration - (millis() - timerStart);
      timerRunning = false;
      inQuestion = true;
      menuOption = 0;
      displayQuestionMenu();
      Serial.println("[INFO] Bottle removed during timer. Asking reason...");
    }

    if (!bottlePresent) {
      displayMultiLine("Please", "place your", "water", "bottle");
    }

    bottlePresent = false;
  }
}

// ------------------ Question Menu ------------------
void handleQuestionMenu() {
  int currentState = digitalRead(CLK);
  if (currentState != lastEncoderState) {
    if (digitalRead(DT) != currentState) {
      menuOption++;
    } else {
      menuOption--;
    }
    menuOption = constrain(menuOption, 0, 1);
    displayQuestionMenu();
    delay(100);
  }
  lastEncoderState = currentState;

  if (digitalRead(SW) == LOW) {
    delay(300);
    Serial.println(menuOption == 0 ? "[SELECTED] Bottle Fell" : "[SELECTED] Drank Water");
    displayMultiLine("Resume", "when", "bottle is", "placed");
    waitForBottleReplacement(menuOption == 0);
    inQuestion = false;
  }
}

void displayQuestionMenu() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Why removed?");
  display.setCursor(0, 20);
  if (menuOption == 0) display.print("> ");
  else display.print("  ");
  display.println("Bottle fell");
  display.setCursor(0, 35);
  if (menuOption == 1) display.print("> ");
  else display.print("  ");
  display.println("I drank water");
  display.display();
}

// ------------------ Helper Functions ------------------
void handleEncoder() {
  int currentState = digitalRead(CLK);
  if (currentState != lastEncoderState) {
    if (digitalRead(DT) != currentState) {
      setTime++;
    } else {
      setTime--;
    }
    setTime = constrain(setTime, 1, 20);
    beep();
    displayTimer(setTime);
    delay(100);
  }
  lastEncoderState = currentState;
}

void beep() {
  digitalWrite(BUZZER, HIGH);
  delay(50);
  digitalWrite(BUZZER, LOW);
}

void displayMessage(String msg, int textSize) {
  display.clearDisplay();
  display.setTextSize(textSize);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println(msg);
  display.display();
}

void displayTimer(int time) {
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Set Time:");
  display.setTextSize(3);
  display.setCursor(20, 30);
  display.print(time);
  display.println(" min");
  display.display();
}

void displayMultiLine(String l1, String l2, String l3, String l4) {
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println(l1);
  display.println(l2);
  display.println(l3);
  display.println(l4);
  display.display();
}

void waitForBottleRemoval() {
  while (digitalRead(IR_SENSOR) == LOW) delay(100);
  while (digitalRead(IR_SENSOR) == HIGH) delay(100);
}

void waitForBottleReplacement(bool resumePrevious) {
  while (digitalRead(IR_SENSOR) == HIGH) delay(100);

  if (resumePrevious) {
    timerStart = millis();
    timerDuration = timeRemaining;
    Serial.print("[INFO] Resuming from: ");
    Serial.print(timerDuration / 1000);
    Serial.println(" seconds");
  } else {
    timerStart = millis();
    timerDuration = setTime * 60 * 1000UL;
    Serial.println("[INFO] Starting new timer.");
  }

  timerRunning = true;
  timeRemaining = 0;
}

void loop(){
  digitalWrite(10,HIGH);
  dleay(1000);
}

Downloadable files

Code and Schematics

https://github.com/RohanBarnwal/Arduino-Projects/tree/master/Water_reminder_copy_20250520103016

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