That sounds like a good addition to my Car. The only question, Does it work only in the US or the whole of the World ? Because I live in India. Jeethu Rao -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Scott F. Touchton Sent: Friday, June 29, 2001 6:46 PM To: PICLIST@MITVMA.MIT.EDU 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 Dan Michaels cc: Sent by: pic Subject: Re: [EE]: Modulating a headlight microcontrolle r discussion list 06/28/01 08:00 PM Please respond to pic microcontrolle r discussion list Miles McKinnon wrote: >I am building a motorcycle headlight modulator using a PIC to monitor >ambient light and a few other things. Anyway, the PIC has to modulate the >headlight ( ~ 4Amps) at a arount 240Hz or so. > Miles, 240 hz is a little high, if your intent is to have people see the flicker as a warning signal. The flicker fusion frequency of humans is about 20 hz, so even 24 hz may be too high. Might be good for insects however. I think somewhere around 4 hz is the most noticeable to humans. You might do a web search on "psychophysics". good luck, - dan michaels www.oricomtech.com ======================== -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu