Dodgey99 built an Arduino-powered Etch-a-Sketch clock, in which a pair of stepper motors painstakingly draw out the current time. It's got a very low refresh rate, though: the limits of the motors and the Etch-a-Sketch means that it takes more than a minute to display the time, and it needs a couple of minutes' rest between each number. There's a plan to accelerate things with some beefier motors.
I use an Arduino driving two very cheap darlington stepper drivers with 64:1 internally reduced steppers for the drawing. For the rotation I'm using an Easy-Driver driving a Nema 17 stepper.
I also have a DS1307RTC real time clock installed so it always knows the time. Setting the time is a one-off via USB connected to a PC. Once done, you un-tether, and then the RTC keeps the time, for up to a year on the rechargeable battery, or so I'm told...
The code is actually very simple, it's just a pain drawing the numbers!
The G clamp on the back is for a counter balance until I find something more elegant!
The steppers are far too slow to write the time in under a minute so I delay it for a couple of mins between each draw. Mostly to give the very hot motors a while to cool off and to give the etch a sketch a break!
Etch a Sketch clock powered by Arduino
I don’t think Stewart’s ever been in finer form, and his “I’ve been living in a cave”/Transmet schtick plays well with Colbert’s own persona.
Russel Cameron’s grotesque, beautiful sculptures “possess human characteristics such as skin texture and some form of anatomical structure,” fashioned into blobby, nightmarish, sexual forms.
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