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’m about to switch off my email until September 5 and drive to Black Rock City for 10 days of incinerating the dude.
As Oracle desperately tries to reanimate its wretched, failed attempt to destroy everything Sun Microsystems stood for and end computer science as we know it, there’s never been a better time to rock one of these “You Wouldn’t Reimplement an API” tees, which were an underground hit during the earlier trial.
Kyohazard’s Lament Configuration is a terrific piece of fan-art for those of us who loved the Hellraiser movies (the good ones, at least).
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