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BuildCircuit is an online store for selling electronics kits and components related to Arduino, Raspberry Pi, etc. We operate from Sydney, Australia.

We design and sell basic electronic kits and Arduino modules for all electronics enthusiasts.


Digital Clock DIY Kit- Build Your Own Digital Clock with Alarm

AU $14.95
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This product is shipped from Sydney, Australia. Worldwide shipping available- we ship to USA, Canada, New Zealand, UK, EU and Non-EU countries.

This is a simple DIY digital clock kit for beginners. 

It is based on AT89C2051-24PU. It has basic functions like hour and minute display, minute and second display and and 2 alarms set up.

There is a buzzer which works as an alarm. You will hear 3 beeps when the clock reaches hours...like 1:00, 12:00, etc. The beep is optional.

You can use a 3.3V to 6V battery to operate this kit.

There are two switches to set up time and alarm- S1 and S2. The display is with 4 digit seven segment display. 

How to set up time ? 

There are two switches S1 and S2 on the kit. After you turn on the kit, you will see hour and minute displayed on the display. Press S2 to see the minute and second, and press S2 once again to go back to see hour and minute display. 

To set time, press S1 until you hear 2 beeps at the same time (beep-beep, very quickly) and then, you will see A displayed on the seven segment. A means hour on the display. Then, press S2 to increase the hour number. After that, press S1 once to see B which means minute setting, you will see 00 by default. Keep on pressing S2 to set the minute. After you reach the required minute setting, press S1 again and you are done. 

How to set up alarm ? 

You can set up two alarms in the kit. Before learning how to set up alarm, you need to learn to set up the time. Then only you will know how to set up the alarm. 

While setting up the time, you will notice A and B displayed on the seven segment display. 

As you keep on pressing switch S1, you will see C, D, E, F, G, H and I. However, there are some conditions. 

Meaning of the text are given below: 

C- Three beeps when the clock display hours, for example, it will beep three times when the clock reaches 1:00, 02:00, 12:00, etc.  - Press S2 to turn it ON or OFF. If you turn it OFF, you won't hear the beep.

D- You will see D when you press S1. It is the first alarm- Press S2 to turn it ON or OFF

G- Second Alarm- Press S2 to turn it ON or OFF.  

If you have turned ON D, then, you will see E and F.

E means hour setting for the first alarm and F means minute setting for the first alarm. 

Likewise, if you have turned ON G, you will see H and I.

H means hour setting for the second alarm and I means minute setting for the second alarm. 

Press S2 to increase hour and minute in both alarms.  

Included Components:

  1. 1 x PCB
  2. 1 x Integrated Circuit Chip-  AT89C2051-24PU.
  3. 1 x IC socket
  4. 2 x 10K resistor
  5. 2 x Reset tactile switch
  6. 1 x SS8550 transistor
  7. 1 x 12Mhz oscillator
  8. 1 x 0.1uF capacitor
  9. 2 x 30pF capacitor
  10. 1 x 10uF electrolytic capacitor
  11. 1 x buzzer
  12. 1 x 2 pin screw terminal
  13. 1 x resistor package.
  14. 1 x 4 digit seven segment display

The schematic is given below:



1. Assembly tutorial

2. How to use digital clock

3. Download manual

Package Includes: 1 x Components required to build Digital Clock

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