Arduino ds1302 7segment clock

Real-time digital clock using Arduino, DS1302 RTC module, and 4-digit 7-segment display. It alternates between showing hours:minutes and minutes:seconds every few seconds.

This Arduino project demonstrates how to build a real-time digital clock using the DS1302 RTC module and a 4-digit 7-segment display. The program reads the current time from the DS1302 chip and displays it on the 7-segment display. Every 3 seconds, it automatically switches between showing HH:MM and MM:SS formats.

Features:

• Uses DS1302 RTC for accurate timekeeping.
• Displays time on a 4-digit common cathode 7-segment LED.
• Alternates display between hours:minutes and minutes:seconds.
• Simple and compact multiplexing code for smooth brightness.

🔧 Hardware Required / Phần cứng cần có:

• Arduino Uno (hoặc tương thích)
• DS1302 RTC module
• 4-digit 7-segment LED (common cathode)
• Jumper wires & breadboard

⚙️ Connections / Sơ đồ kết nối:

Component -> Arduino Pin

• DS1302 RST -> A3
• DS1302 DAT -> A2
• DS1302 CLK -> A1
• Segment a–g, dp -> 2–9
• Digit D1–D4 -> 10–13

⚙️Manual Installation (if Library Manager doesn’t find it)

• Download the DS1302 library from GitHub:

  👉 https://github.com/msparks/arduino-ds1302

• Then in Arduino IDE:

  Go to Sketch → Include Library → Add .ZIP Library…

  Select the downloaded .zip file.

  Wait for it to install — you’ll see “Library added to your libraries”.

• ✅ Now you can include it in your code with:

  #include <DS1302.h>

📸 Optional preview: