Projection clock: cheap
2006-02-02 17:41:32.259603+01 by
Dan Lyke
2 comments
Last weekend we went to a local school fundraiser: Bingo night. I felt 70 years old and Catholic, but we had a lot of fun. One of the issues, however, is that a room full of kids is loud, and I started daydreaming about cheap ways to build a large display to put the numbers up high, rather than just being written on a low and easily obscured white board after they were called.
Mark V had a link to a note on using a cheap digital watch to build a projection clock. Not an immediate solution, for one thing the main problem with projection systems is building a cool light source that's bright enough to make a difference, but one which has me thinking...
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comments in ascending chronological order (reverse):
#Comment Re: made: 2006-02-02 23:34:36.201268+01 by:
mvandewettering
You could put 100 15,000 millicandela leds together for about $28.00.
http://cgi.ebay.com/100-MEGA-B...05QQcategoryZ26207QQcmdZViewItem
Shine these through a simple mask and then through projection optics, and you would probably get pretty good results. Total current, roughly 2 amps, which
seems doable.
#Comment Re: made: 2006-02-02 23:35:23.820793+01 by:
mvandewettering
http://www.instructables.com/e...9D07B9C83FD1028A786001143E7E506/
also would seem to be relevent...
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