--0__=85256A7A0054EA498f9e8a93df938690918c85256A7A0054EA49 Content-type: text/plain; charset=us-ascii You will get a ticket, I know. My old boss loved the idea, so we built him a unit based on a strobe tube and used an IR filter to "hide" the flash. Of course, when we did this, he told us it was a development project for a product he was going to sell to the fire departments. Anyway.. the thing got mounted on the top of his truck... he got away with it for about 2 months. Then the police caught on. They staked out the local big intersection, and discovered that the same Ford pickup (with the big shiny reflector up on top) was always going through the intersection when the priority green system activated. He got fined. It is a very simple system. All you need to do is pulse modulate an IR source at a 14hz rate (flash at 14hz rate). It is tough to use point sources (such as LED's) since they must be pointed at the receiver on the light pole. We used the strobe to get a broad emission. Now for the ethics: This info is in the public domain (so I am sharing nothing confidential). There are companies out there who will sell you this equipment. You can also sell this equipment to municipalities. If you abuse this system you will get in trouble with the authorities. I do not condone use of this system. I have seen very close calls caused by fire trucks and ambulances (let alone nuts in pickup trucks). People get used to the pattern at a traffic light, and when the light suddenly changes people are caught by surprise. Scott michael brown cc: Sent by: pic Subject: [OT]: Priority Green was Modulating a headlight microcontrolle r discussion list 06/29/01 10:44 AM Please respond to pic microcontrolle r discussion list Scott, I am very interested in any information you could give me about Priority Green specs. Living in Houston is unbelievable. I swear the oil companies are in control of the traffic light timing. I have never been anywhere else in the US where you had to stop for approx 90% (this is not an exaggeration) of every traffic light you encounter. It simply has to be seen to be believed. It's so bad that people who are approaching a light that is green will begin to slow down (preparing to stop), because they have been so well conditioned. They seem to think that something is wrong with the light, and it might be green in both directions. I admit that after eleven years of this stuff, I am skeptical of greens too. But you should see the way that people will race thru a red even though it's been red for more than three seconds. It's absolutely astounding. Not that I would ever do anything illegal, I am still interested in the specs. ;-D Michael Brown Instant Net Solutions www.KillerPCs.net "In the land of the blind, he who has one eye is king" ----- Original Message ----- From: "Scott F. Touchton" To: Sent: Friday, June 29, 2001 8:16 AM Subject: Re: [EE]: Modulating a headlight > > Back it down to 14hz and you can trip all the Priority Green systems here > in the US... have a green light everywhere you go!!! (and alot of other mad > drivers!!!). Of course, this is probably illegal. > > Scott F. Touchton > 1550 Engineering Manager > JDS Uniphase -- http://www.piclist.com#nomail Going offline? 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