Flex PCB Binary Watch

Binary flexible PCB watch

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This project is a watch that displays time in binary. It will be made on a flexible pcb, and mounted into a flexible 3D printed TPU band.

I am using an ATTINY20 for controlling everything, and an M41T62 RTC chip for, well, timing. I am also using a TLC59282 LED driver.

There are 2 rows of LEDs at the top: a row of 4 to display hours, and a row of 6 for minutes. There is a third row at the bottom for the seconds.

There are three (3) buttons on the bottom front. The left button lets you choose between hours or minutes and the right button increments the selected function by one with each press.

The watch will be running off of a single CR2016 3v battery, and in the interest of saving power the LEDs will be turned off most of the time. The middle button on the watch face will turn display the current time for 5 seconds, then turn the LEDs back off.

After the project is completed I will upload the 3D models, KiCad files, and link to the code repository.

Enjoy this project?



Ryan Absher wrote 05/25/2019 at 19:58 point


I'm trying to keep it very simple, so there is a row of 4 LEDs at the top to display hours, and a row of 6 LEDs below that for the minutes.

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Tyler Gerritsen wrote 05/25/2019 at 20:04 point

Very simple, I would love to see the final build. Having seconds would also be cool, but I could see how you lose simplicity.

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Ryan Absher wrote 05/30/2019 at 15:45 point

After thinking about it some, I think you're right. I have re-designed the project to allow it to show seconds as well.

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Tyler Gerritsen wrote 05/30/2019 at 20:00 point

I like the new layout.  The seconds having some separation from the buttons.  Nicely executed!

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Tyler Gerritsen wrote 05/25/2019 at 19:51 point

This sounds like a great way to practice reading binary!  I don't normally wear a watch, but would actually consider it for this.  What are you using for the display?

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