MatriLED Watch

This is a full 4,096 color 8×8 LED matrix based wristwatch with software-driven 4-bit PWM for each channel at 60 full PWM sweeps per second.

Background

I wanted to see how much performance I could squeeze out of the then-newly released PIC16F1 series of MCUs.

Video of time display

What it does

  • Displays time in a totally tubular way.

What it’s made of

Theory of operation

Press a button and the time shows up for three full seconds before putting the MCU to sleep. With the PWM blazing away at 60 full refreshes per second, there remains 50% CPU time available to do work. Pretty amazing for a ~$0.75 part. How time is represented:

  • Current second: fading yellow pixel, going from upper-left to lower right.
  • Current minutes (units): two-pixel wide blue column on far right. 0-8 are shown as pixels emanating from top as zero and bottom as 8. 9 is shown as a red pixel at the bottom.
  • Current minutes (tens):  two-pixel wide blue column on middle right.
  • Current hours (units):  two-pixel wide blue column on middle left.
  • Current hours (tens):  two-pixel wide blue column on far left.

Conclusion

Yuuuuup

UFanders

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