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Charliewatch
n the rush to digitisation, we’ve lost something
immediate about analogue interfaces. Numbers
need a moment to parse, dials have to be read and
understood, rather than just glanced at. That’s not so
with Trammell Hudson’s Charliewatch, based on Travis
Goodspeed’s GoodWatch21 schematic. It uses 72 surface
mount LEDs to tell the time, just like an analogue clock-face. It’s
so simple, we feel a bit silly explaining it: you can clearly see that it
has 60 LEDs instead of a minute hand, and twelve LEDs to denote
the hour hand. And the name? That comes from Charlieplexing,
which is how the LEDs are chained together.I
By Trammell Hudson hsmag.cc/d1odGiRight
After a year of use,
the Charliewatch
has consumed two
CR2032 batteries
Credit
CC-BY Trammell Hudson