There are many ways to judge time, from using analog dial to 7-segment display. Hackers tend to like binary watches. If only because of their connection with digital machines, these digital machines seem to have changed the world today. [Vishal Sony] decided to build one by himself.
This is a simple design, using six digits to display time. The red light on the top of the watch lights up, indicating that the watch displays minutes, which are displayed in binary form on the six blue LEDs below. Then, the watch displays the hours and uses the six blue LEDs again to display the relevant numbers.
[vishal] calls it a binary coded decimal (BCD) watch, but BCD involves using binary to directly represent numbers between 0 and 9. Instead, it seems to be a conventional binary watch using 6-bit symbols.
The core of the watch is attiny85, which is also equipped with tp4056 for charging and maintaining the lithium battery used to power the watch. Charge through usb-c port. It’s all built on a custom printed circuit board, designed as the body of the watch, with the shoulder strap directly connected to the printed circuit board itself. The only thing missing is a 32.768 kHz crystal or real-time clock for accurate timing.
In general, this is an interesting build that can teach [VISAR] many useful design skills. We believe that these will play a good role in future projects. If you’re mining binary watches, think about some of the other great builds we’ve seen over the years. Video after break.