Comments | ewedistrict: (без темы)

ewedistrict

(Untitled)

Oct 30, 2009 01:27

Shown here is a split-flap single-digit display in action. The display is designed in sketchup, printed using a laser cutter on birch, and made of absolutely nothing but glued wood. The motor is a three-wire switched reluctance motor, which I control by energizing the three coils independently using an RBBB Arduino-like microcontroller and a ( Read more... )

Comments 11

jestercard October 30 2009, 09:00:44 UTC

That's beautiful.

tweetxor October 30 2009, 18:38:28 UTC

Nifty!

Does it spin both ways? It appears like it doesn't yet but maybe this is planned. If not... Doesn't it make more sense to put the numbers in descending order? That way as the minutes count down one-by-one it doesn't have to spin completely around each update.

ewedistrict October 30 2009, 18:46:59 UTC

I rigged the motor to step in either direction but the flip board only works when it's flipping in one direction. Regarding the numbers should count down: you are most correct.

the101dmnations October 30 2009, 19:58:29 UTC

You will be a damn mass transit Robin Hood if you put a real-time bus arrival sign in a shop window, bless your heart. This is wonderful stuff.

ewedistrict October 30 2009, 19:59:57 UTC

One shop? Oh no. I want to make hundreds.

the101dmnations October 30 2009, 20:04:54 UTC

Still, I want to have a ceremony involving a big crowd in sackcloth and a milk-and-Trader-Joe's-dunkers toast when the first one is put up.

ewedistrict October 30 2009, 20:07:36 UTC

Grand idea. I've been looking for a PR manager. You're hired.

peristaltor October 30 2009, 20:17:23 UTC

Retro cool!

loganb October 31 2009, 00:30:23 UTC

Do you have a link to the SRM and/or where'd you find control info for it? I hear they're significantly harder to operate than BLDC motors.

ewedistrict November 1 2009, 07:17:23 UTC

The only thing I had to go on was the SRM Wikipedia article - I implemented a sort of three-way H-bridge to switch up the three coils. After taking the thing apart and re-reading the wikipedia SRM article, I don't think it's an SRM anymore - it's just a funky little minimalist stepper that for whatever reason doesn't work with any of the stepper drivers they tried before I showed up. In conclusion, this is why abstraction frameworks are counterproductive in a pedagogical setting.