LED Wristwatch

I wanted to make a small, practical wristwatch that could be enclosed in a "fashionable" enclosure.

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Like many users on this site, I tend to have a lot of projects I've been wanting to do on the back of my mind. One of them was making my own unique digital wristwatch, and when the square inch project rolled around I decided it was the perfect opportunity to give it a shot. Also, this is my first project for

This watch uses an Atmel Atmega88 (Kinda overkill, but was actually easier to use than a smaller package), with a DS1307 RTC and a two-digit alphanumeric display. I could have gone down the smartwatch route, but I've always had an affinity for seven-segment displays and their aesthetic qualities. The plan is to incorporate this into an enclosure of milled mahogany and machined aluminum, with an acryllic protective sheet over the watch-face. One of the buttons triggers the set command, one increments the value, and the other on the pcb toggles between hour-minute and month-day modes. There is a fourth button that will be implemented into the case that will act so that when the watch face is depressed the digits will temporarily illuminate for a couple of seconds, to get maximum life out of the battery.

  • 1 × ATMEGA88A Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
  • 1 × DS1307 RTC RTC with year, month, day, hour, minute, second functionality
  • 3 × Right angle SMD NO tactile switch For the set, adjust, and mode buttons
  • 1 × 6 pin ISP header For programming
  • 1 × 2N7000 N-channel MOSFET For switching power to the LEDs

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  • Boards are on the way

    Will11/06/2015 at 03:31 0 comments

    Three copies of my lovely purple boards are on their way from OshPark, and they just barely fit in the Square Inch competition (.99"x.99").

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alpha_ninja wrote 12/07/2015 at 01:12 point

Just a friendly reminder to please upload your design documents (source files and gerbers) by 23:59 UTC on Dec 8, 2015 to be in the running for #The Square Inch Project!

  Are you sure? yes | no

alpha_ninja wrote 12/02/2015 at 00:44 point

This is your one-week reminder to upload design documents:

  Are you sure? yes | no

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