Big Real Time Clock Using Arduino

rahulkhanna

5 Dec 2020

Making Time

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Real-time clock using DS3231 and p10 Display Matrix

This project demonstrates the use of electronics and embedded systems with Clock. Dot-matrix Display or more commonly referred to as Free Running Text is often found in shops as a means of advertising their products, it is practical and flexible in its use that encourages business actors to use it as advertising advice. Now the use of Dot-matrix Display has spread, not just as advertiser media only, as well as prayer schedules, warning boards, queuing machines, etc. Here, we will give a post about how I made a clock using p10 Matrix Display and DS3231 RTC using Arduino.

Step 1: Step 1: Hardware and Software Requirements

HARDWARE:

Arduino Uno x 1
Push-button (Keypad) x 4
RTC Module (DS3231)
P10 Dot-matrix Display

SOFTWARE:

Arduino IDE
DMD 2 Library / DMD Library

Before that, you need a supporting library that must be installed on Arduino IDE. To download the DMD2 library mentioned above

Step 2: Connections

Arduino -> RTC MODULE

A4-> SDA
A5-> SCL
VCC -> 5V
GND -> GND

Arduino -> P10 DMD

D8-> SCK
D6-> A
D7-> B
D11 -> R
D13-> CLK
D9-> OE

Step 3: The Code

You can find the code in the Git Repository.

https://github.com/Rahul24-06/Big-Real-Time-Clock-Using-Arduino

Step 4: Features

DMD

32 x 16 high brightness Red LEDs (512 LEDs total) with 10mm pitch
Supports 5V operation
Viewable over 12 meters away
Tough plastic frame
Onboard Controller IC
Arduino compatible library, graphics functions

RTC

counts seconds, minutes, hours, and year
Accuracy: +2ppm to -2ppm for 0ºC to +40ºC, +3.5ppm to -3.5ppm for -40ºC to +85ºC
Digital temperature sensor with a ±3ºC accuracy
Two Time-of-day alarms
Programmable square-wave output
Register for Aging trim400Khz I2C interface
Low power consumption
Automatic power failure battery switch circuitry
CR2032 battery backup with two to three-year life

Working of This Project: Simple Clock

Working of This Project: Clock With Settings

Step 7: Conclusion

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Thanks for reading!

Top Comments

Parents

Fred27 over 4 years ago

I see quite a lot of this in your code:

switch(minute)
{
  case 0:
    dmd.drawString( 12,0, "00", 2, GRAPHICS_NORMAL );
    break;
  case 1:
    dmd.drawString( 12,0, "01", 2, GRAPHICS_NORMAL );
    break;
  case 2:
    dmd.drawString( 12,0, "02", 2, GRAPHICS_NORMAL );
    break;
    
  ...
  
  case 59:
    dmd.drawString( 12,0, "59", 2, GRAPHICS_NORMAL );
    break;
}

The sprintf function could be used to simplify this a lot.

Comment