It’s rare for the fields of the engineer and the mediaevalist to coincide, but there’s a clock project bringing the two fields together. The Cistercian monastic order used an intriguing number system from the 13th century onwards that could represent any four-digit number as a series of radicals expressed in the four corners of a single composite symbol, and it’s this number system that’s used by the clock to render the full range of 24 hour time on a large 5×7 LED matrix mounted on a wooden base.
Every numeral has a line down the middle, and the system uses the four quadrants of space around it to display the ones, tens, hundreds, and thousands positions starting in the upper right corner.
[andrei] adapted the system to show time by assigning tens of hours to the thousands quadrant in the bottom left, hours to the hundreds quadrant in the bottom right, tens of minutes in the upper left, and minutes in the top right. The tricky part is that the system has no zero, but [andrei] just darkens the appropriate quadrant to represent zero.
The timekeeping is done with an ESP-01, and there are a total of 31 RGB LEDs including the middle bit, which blinks like a proper digital clock and doubles as a second hand. As usual, [andrei] has provided everything you’d need to build one of these for yourself. We admit that the system would take a little time to learn, but even if you never bothered to learn, this would make a nice conversation piece or focal point for sitting and staring. Take a minute to check it out in action after the break.