Now a bit of floating sin/cos to flatten out the images (rather than
wrapping around the z-axis !!)

Excellent product !!

I can think of a large market if you can get rid of the shaft encoder...
the display must be able to mount 'effectively' in free space, so some other
method for determining the rotation start point is needed.... minimum
clearance from nearest static object is about 4--to-6 inches - so hall
effect is not an option - perhaps an IR  pair at the index point ??

 -----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
Behalf Of Joris van den Heuvel
Sent: Tuesday, 1 January 2002 00:18
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]: Mechanically scanned display


  Hey y'all,

  Remember Bob Blick's Propeller clock (www.bobblick.com)?

  I am very excited about having built a mechanically scanned display,
taking Bob's Propeller as an inspiration. I multiplied about every aspect of
the Propeller by four, and came up with the following:

  - radially scanned display
  - diameter is 1 meter across
  - rotation speed is currently 300-400 rpm
  - Led bar contains 35 rectangular dual LEDs, 32 green, 3 yellow
  - microcontroller is a PIC16F876-20
  - synchronization is done by a 480-pulse shaft encoder
  - Power to the PCB is supplied through the ball bearings
  - The rotor is driven by a DC motor at 3 volts, 3 amps
  - The software is contained in 7 files, making the total listing over 1500
lines.

  The clock diplays the following:

  - an analog clock: seconds, minutes, hours, and hour markers
  - a digital clock: time, weekday, date, year
  - a 64x32 pixel logo
  - the logo changes over to a 96 bit wide scrolling message every 4 minutes

  I'll be putting up a web page.

  TTYL,

  Joris van den Heuvel.





  _______________________________________________________________
  "Bass is the basis of all that is music"

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