What is BCD? The full form of BCD is binary coded decimal, as its name the binary digits is showing decimal value. It is a very simple representation of decimal numbers in different ways, so you can google BCD or binary coded decimal on google.

Why did I make this? I want to make a watch which has led, so instead of a simple watch I came with a unique idea. This watch shows time in binary digits. In my engineering I have learned about binary coded decimals, I think some schools also teach this. This unique way of time representation is not easily understood by normal users.

How it Works? There is a single button in the controller, if you press the button it will show hours and minutes in one second of delay as shown in the image. When it show hours the re led on the top will glow and when it shows minutes the minute led on the top will glow.

YouTube link :- https://www.youtube.com/watch?v=fd1oudY0hw8

When you long press the button it will go in to setting mode,

Firstly the hour led will blink means it is in hour setting mode, the hours can be increased by pressing the button.

When you long press the button again it will go in minutes setting mode, the minute led will start blinking. The minutes can be increased by pressing the button.

Now to come out from setting mode long press the button again, after long pressing it will show normal hours in minutes with one second of delay as before.

Note:- This watch Does not use RTC So time may be mismatch after few hours. Recommended :- set time every day in morning.