Add Arduino Pomodoro Timer Project with Code and Documentation

Pomodoro Timer/README.md

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+
+# Arduino Pomodoro Timer
+
+## Project Overview
+This simple project uses an Arduino UNO to create a Pomodoro Timer with LED indicators and a buzzer. It helps users focus by timing 25-minute work sessions and 5-minute breaks. A button is used to start the timer.
+
+## Features
+- 25-minute work session  
+- 5-minute break  
+- Buzzer alerts at transitions  
+- LED color changes for work/break  
+
+## Components Required
+- Arduino UNO  
+- Red LED  
+- Green LED  
+- Buzzer  
+- Push Button  
+- 220Ω Resistors  
+- Breadboard and Jumper Wires  
+
+## Circuit Connections
+
+| Component    | Arduino UNO Pin     |
+|--------------|----------------------|
+| Red LED      | D3 (via 220Ω resistor) |
+| Green LED    | D4 (via 220Ω resistor) |
+| Buzzer       | D5                   |
+| Push Button  | D2 (with pull-down resistor) |
+
+## Working Principle
+- Press the button to start a 25-minute work session (Red LED on).
+- After 25 minutes, the timer switches to a 5-minute break (Green LED on).
+- The buzzer alerts the user at each transition.
+- After the break, the session ends and the system resets.
+
+## Usage Instructions
+1. Connect all components according to the table above.
+2. Upload the `pomodoro_timer.ino` sketch to your Arduino UNO.
+3. Open the Serial Monitor (9600 baud) for status messages.
+4. Press the button to start the Pomodoro timer cycle.
+
+## Author
+Created by [KappaNone](https://github.com/KappaNone).
+
+## License
+This project is open-source and available for educational and personal use.

Pomodoro Timer/pomodoro_timer.ino

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+// Arduino Pomodoro Timer Project
+// Description:
+// 
+// Arduino Pomodoro Timer
+// 
+// Project Overview
+// This simple project uses an Arduino UNO to create a Pomodoro Timer with LED indicators and a buzzer. It helps users focus by timing 25-minute work sessions and 5-minute breaks. A button is used to start the timer.
+// 
+// Features
+// - 25-minute work session
+// - 5-minute break
+// - Buzzer alerts at transitions
+// - LED color changes for work/break
+// 
+// Components Required
+// - Arduino UNO
+// - Red LED
+// - Green LED
+// - Buzzer
+// - Push Button
+// - 220Ω Resistors
+// - Breadboard and Jumper Wires
+// 
+// Circuit Connections
+// Component       Arduino UNO Pin
+// Red LED         D3 (via 220Ω resistor)
+// Green LED       D4 (via 220Ω resistor)
+// Buzzer          D5
+// Push Button     D2 (with pull-down resistor)
+// 
+
+
+const int redLED = 3;
+const int greenLED = 4;
+const int buzzer = 5;
+const int button = 2;
+
+bool running = false;
+unsigned long startTime = 0;
+const unsigned long workTime = 25UL * 60 * 1000; // 25 minutes
+const unsigned long breakTime = 5UL * 60 * 1000; // 5 minutes
+
+void setup() {
+  pinMode(redLED, OUTPUT);
+  pinMode(greenLED, OUTPUT);
+  pinMode(buzzer, OUTPUT);
+  pinMode(button, INPUT);
+  Serial.begin(9600);
+}
+
+void loop() {
+  if (digitalRead(button) == HIGH && !running) {
+    running = true;
+    startTime = millis();
+    digitalWrite(redLED, HIGH);
+    Serial.println("Work started");
+    tone(buzzer, 1000, 500);
+    delay(500);
+  }
+
+  if (running) {
+    unsigned long elapsed = millis() - startTime;
+
+    if (elapsed >= workTime && elapsed < workTime + breakTime) {
+      digitalWrite(redLED, LOW);
+      digitalWrite(greenLED, HIGH);
+      Serial.println("Break started");
+    }
+
+    if (elapsed >= workTime + breakTime) {
+      digitalWrite(greenLED, LOW);
+      tone(buzzer, 1500, 500);
+      running = false;
+      Serial.println("Session complete");
+    }
+  }
+}