There was a project just for this in Electronics Now or Popular Electronics just recently. I'd say Feb. or March issue. If I have time tonight, I'll dig-up the article. As I recall, it uses a PIC and a group of LEDs on a pendulum to provide the date and time using the same "persistence of vision" as mentioned below. I don't recall if the swinging was user-invoked, motorized or magnetic. Rich ========================== Richard A. Cini, Jr. Congress Financial Corporation 1133 Avenue of the Americas 30th Floor New York, NY 10036 (212) 545-4402 (212) 840-6259 (facsimile) -----Original Message----- From: Marvin [mailto:marvin@rain.org] Sent: Tuesday, May 09, 2000 11:06 AM To: classiccmp(a)classiccmp.org Subject: Re: Cool hack (was Busses vs no busses) John Foust wrote: I can't recall either, but that brings to mind an interesting project a friend of mine worked on quite a few years ago. The Art Museum here was having some kind of show and an artist wanted to paint electronic pictures. My friend designed the electronics (I built the circuit boards) to put a line of LEDs on a pendulum and paint pictures electronically as the pendulum swung through its arc. With the multi-colored and higher intensity LEDs available today, it would be really cool to do the same thing but with color pictures. Doesn't sound like too hard a project especially with the speed of todays computers.