Binary Wrist-Band Watch




I think its often cool to show off with a retro Gadgets. I was planning to make a wrist watch with LCD display, but then I changed my mind and made this Binary Wrist Watch on a prototype board. Even I made a micro controller with Atmega328p-pu but any Arduino can be used in place of it ( Arduino pro mini will be the best option for this project)
Lets start :)

Step 1: List of Things ... !!!

1. Arduino Pro Mini (or Atmega 328p -pu)

2. 3 mm L.E.D (minimum 13 )

3. Prototype board

4. Soldering iron

5. Soldering wire

6. Multimeter

7. Push button (x3)

8. Resistor (330 Ohm)

9. Wire ( thinner is better )

10. Wrist band material

11. Velcro or Band lock

12. Heat shrink tubing

13. Battery

Step 2: Project Idea

Binary Clock: How to read it ( )

Selection of the Microcontroller : Before starting this project I must say that if you are a beginner then you may also use a Led Matrix Module. This project need a lot of soldering job, so be patient do check for short circuit by continuity test.
I used a Standalone Arduino as I dont have a Arduino pro mini. But its better to use a Pro mini .

Step 3: Schematic

The LED s are connected to the Arduino's Digital pins(1 to 13) according to Schematic. The push buttons are connected to the Analog pins (A0, A4 and A5) respectively.

Step 4: Make LED Display

Before soldering the LED s to the board align them properly and check if the spacing among them is correct or not. Then solder all the cathodes and connect then to the GND with wire.

Then add the 220Ω resistors to the anodes of the LED as shown in the picture.
Its better to use Tape to hold those LED s in position while soldering.

Step 5: Adding the Buttons

Now connect all the three buttons on the board then solder the resistors (10 Kohm) . The connection is done according to the Schematic as shown in previous step. Connect the buttons to the Analog pin A0, A4 and A5 .

The buttons will set the minutes, hours andd the display status ( if the display will remain on or off).
The connection are almost done !!!

Step 6: Power !!!

To power the board lithium ion battery can be used as they are small as well as they are light weight too.
The current consumption of the total unit is around 30mA (max) when all LED s are on, at ideal condition (display is off) it consumes around 8 to 10 mA.
For a 5V arduino pro mini even 2 X 3v button cells in series will work fine !

Step 7: Connecting With Arduino

Before power on check all the connections.

Step 8: Upload Program to the Clock and Let the Retro Machine Rock

Now upload the program and set the time by pressing the buttons. The electronic part is done :)
Lets move on to make the band !

Step 9: Prepare the Band

For the band you may use leather, fabric what ever you feel like. I am not good in this kind of work but i tried to manage things up, with your creativity in many ways the band can be decorated according to your wish..!
You may ask for help from your parents or friends.
I used a torn piece of Jeans for the band and attached velcro at its end for fitting it to the wrist of my hand.

Step 10: Its Done ....!!!! :)

Its done have fun with your new watch !!!
It may be old school, You may have many expensive wrist watches but still its your watch, you made it... It will always remain special to you :) :P :D



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    14 Discussions


    2 years ago

    I want to make something similar to this, but I have a question, you state that the watch is drawing 8-10 mA at 6 V when not activly used. Online I have found that batterys similar to the ones shown have a capacity of about 260 mAh so is it true that your watch only works for a little more than one day until the batterys are empty ?

    Thanks in advance


    3 years ago

    I have no experience with an Arduino. I think a video would be very helpful. This is hard to follow. I don't know if that is just because I know nothing about this, or if it really is. Please help me, I would like to try this, but I don't know how to do it. Even after reading this several times.


    3 years ago

    uh bruh ? where is pin 1 tho ? i'm having a hard time finding pin 1 XD

    3 replies
    Kaustav NandyPhamA1

    Reply 3 years ago


    3 years ago

    I'm a little lost with step 7...what is that board for? Is that for testing? This is too cool of a project not to do. I can't wait to undertake it!

    1 reply
    Kaustav Nandyruiz8098023

    Reply 3 years ago

    That board is a Arduino (self made) if you want toy can make your own , or use a Pro mini. For more details check the link !!

    Link :


    3 years ago

    Doesn't the arduino typically have trouble keeping track of time though? I have heard you typically need a RTC module. How did you account for this?

    1 reply
    Kaustav NandyDadNerd

    Reply 3 years ago

    Arduino will keep track of time untill you power it off. In RTC there is a 3v battery in the module so that it can keep the track of time even if you power off your arduino.


    3 years ago

    Very good project !


    3 years ago

    Very well made. Nice project!