Metric Time: 10 Hours/day, 100 minutes/hour, 100 seconds/minute. You can also see what percent of the day is gone by looking at the first 2 digits. For example 8:65:71 means 86.571% of the day is past. Hex Time: 16 Hours/day, 16 minutes/hour, 256 seconds/minute displayed in hex (base 16). So actually it reads F hours per day, F minutes per hour, FF seconds per minute Circle Time: 2pi radians makes up 1 day (6.2832).
The brain of the clock is a PIC microcontroller (PIC16F873) running at 4MHz. I was lucky enough to be able to complete this project using a C compiler for the firmware (otherwise the oddball conversions would have taken forever to write!). I have decided not to post the schematic or the source code, but email me if you're interested.
Two boards were built: One to hold the display and one to hold the microcontroller. They were etched in my basement on 1-ounce single-sided copper clad board. I layed out, etched, drilled holes, and stuffed the boards myself. Most of the components are on the bottom side because I used mainly surface mount.
The concept of redefining time is a bit tricky. There are 86,400 regular seconds in a day but there are 100,000 metric seconds in a day. So a metric second is a bit shorter than a regular second. The clock has gets a pulse ever 1/60th of a regular second so it has to turn 5184000 pulses into 100,000 seconds in each day. That means the metric clock is incremented 1 second every 51.84 pulses. Hex time has 65536 seconds in a day so the conversion is similarly complicated.
Last Updated: Dec 16, 2001