Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!spool.mu.edu!news.cs.indiana.edu!ux1.cso.uiuc.edu!mrcnext!khan From: khan@mrcnext.uiuc.edu (Scott Coleman) Newsgroups: sci.electronics Subject: Re: IR receiver on traffic lights ? Message-ID: Date: 13 Apr 91 18:30:18 GMT References: <1991Apr12.042157.6685@engage.enet.dec.com> <1991Apr12.063837.7120@bradley.bradley.edu> <31802@ucsd.Edu> Sender: usenet@ux1.cso.uiuc.edu (News) Distribution: na Organization: University of Illinois at Urbana Lines: 18 brian@ucsd.Edu (Brian Kantor) writes: >The "Opticon" sensors in use throughout San Diego County for traffic >light control by emergency vehicles use a photocell in a focusing >assembly that's pointed down the road. They ignore changes in ambient >light levels and look for flash rates of either 10 or 16 hz, which the >bus or emergency vehicle generates with a very bright xenon strobelight. Hmm... Sounds to me like a few parts from Radio Shaft will get you a sure- fire way to minimize the dreaded morning commute! ;-) -- Scott Coleman tmkk@uiuc.edu University of Illinois at Urbana-Champaign "If a software computer consultant believes her gonads are ruled by the moon, then none of us is safe." - Karla Jennings