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 :)

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

Binary Clock: How to read it ( http://www.wikihow.com/Read-a-Binary-Clock )

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 .

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.

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.

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 !!!

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 !

Before power on check all the connections.

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

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