A sophisticated embedded alarm clock system built with Arduino featuring dual displays, EEPROM persistence, and event-driven architecture. The project demonstrates advanced embedded systems concepts including state machines, non-blocking timing, and peripheral interfacing.
Project PDF: https://drive.google.com/file/d/141YLlyCd1m-ADxvGdJSr8hZXGjwtr2hI/view?usp=sharing
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Dual Display System: 16x2 LCD for time + 128x32 OLED for status messages
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Real-time Clock: Software-based timekeeping with hours, minutes, and seconds
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Configurable Alarm: Set custom alarm times with persistent EEPROM storage
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Musical Alarm: Plays "Take On Me" melody through buzzer with non-blocking playback
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State Machine: Four operational modes (Normal, Set Hour, Set Minute, Alarm Triggered)
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Event-Driven Design: Fully asynchronous with no blocking calls
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Smart Persistence: EEPROM storage with magic number validation and write-on-change
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Dual Button Control: Intuitive interface for alarm setting and control
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Arduino Uno/Nano
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16x2 LCD Display
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128x32 OLED Display (I2C)
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Piezo Buzzer
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2x Push Buttons
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Breadboard and Wires
LCD Connections:
- LCD RS pin → digital pin 12
- LCD Enable pin → digital pin 11
- LCD D4 pin → digital pin 5
- LCD D5 pin → digital pin 4
- LCD D6 pin → digital pin 3
- LCD D7 pin → digital pin 2
- LCD R/W pin → GND
- LCD VSS pin → GND
- LCD VDD pin → 5V
- LCD A pin → 5V (backlight)
- LCD K pin → GND
Additional Components:
- OLED SDA → A4 | OLED SCL → A5 | OLED VCC → 5V | OLED GND → GND
- Buzzer → digital pin 8
- Set Button → digital pin 6 → GND
- Stop Button → digital pin 7 → GND
SET: Enters setup mode, increments values, navigates menus STOP: Confirms selections, stops alarm, exits modes
- Triggers precisely at the set time
- Plays looping musical melody
- Provides visual feedback on both displays
- Can be silenced with STOP button