Outdoor IR beam fence
I need a 30 foot outdoor IR beam "fence" ,
that closes a relay when the beam is broken . Thanks ... Jim |
Outdoor IR beam fence
http://www.ramseyelectronics.com/cgi...ction&key=LTS1 Or you can modify a laser pointer and use a Radio Shack photodiode to trigger the relay pretty easily... I can send a schematic if you like... fazelock On Mon, 29 Sep 2003 01:24:17 GMT, Jim Davis wrote: I need a 30 foot outdoor IR beam "fence" , that closes a relay when the beam is broken . Thanks ... Jim |
Outdoor IR beam fence
http://www.ramseyelectronics.com/cgi...ction&key=LTS1 Or you can modify a laser pointer and use a Radio Shack photodiode to trigger the relay pretty easily... I can send a schematic if you like... fazelock On Mon, 29 Sep 2003 01:24:17 GMT, Jim Davis wrote: I need a 30 foot outdoor IR beam "fence" , that closes a relay when the beam is broken . Thanks ... Jim |
Outdoor IR beam fence
I need IR's invisiblity .
Perhaps a standard modulated TV receiver , fresnel lens , aluminum foil , and several LED's transmitting ? wrote: http://www.ramseyelectronics.com/cgi...ction&key=LTS1 Or you can modify a laser pointer and use a Radio Shack photodiode to trigger the relay pretty easily... I can send a schematic if you like... fazelock On Mon, 29 Sep 2003 01:24:17 GMT, Jim Davis wrote: I need a 30 foot outdoor IR beam "fence" , that closes a relay when the beam is broken . Thanks ... Jim |
Outdoor IR beam fence
I need IR's invisiblity .
Perhaps a standard modulated TV receiver , fresnel lens , aluminum foil , and several LED's transmitting ? wrote: http://www.ramseyelectronics.com/cgi...ction&key=LTS1 Or you can modify a laser pointer and use a Radio Shack photodiode to trigger the relay pretty easily... I can send a schematic if you like... fazelock On Mon, 29 Sep 2003 01:24:17 GMT, Jim Davis wrote: I need a 30 foot outdoor IR beam "fence" , that closes a relay when the beam is broken . Thanks ... Jim |
Outdoor IR beam fence
I believe with a 555 timer you could send out low duty cycle pulses,
which would be invisible even though it is a visible laser. Short Pulse widths in the order of a few mS on and a lot of mS off ( say 5 on, 50 off) might do the trick.... It would also serve to reject any ambient light falling on the photodiode.... It would be fun to play with.. On Mon, 29 Sep 2003 19:52:55 GMT, Jim Davis wrote: I need IR's invisiblity . Perhaps a standard modulated TV receiver , fresnel lens , aluminum foil , and several LED's transmitting ? wrote: http://www.ramseyelectronics.com/cgi...ction&key=LTS1 Or you can modify a laser pointer and use a Radio Shack photodiode to trigger the relay pretty easily... I can send a schematic if you like... fazelock On Mon, 29 Sep 2003 01:24:17 GMT, Jim Davis wrote: I need a 30 foot outdoor IR beam "fence" , that closes a relay when the beam is broken . Thanks ... Jim |
Outdoor IR beam fence
I believe with a 555 timer you could send out low duty cycle pulses,
which would be invisible even though it is a visible laser. Short Pulse widths in the order of a few mS on and a lot of mS off ( say 5 on, 50 off) might do the trick.... It would also serve to reject any ambient light falling on the photodiode.... It would be fun to play with.. On Mon, 29 Sep 2003 19:52:55 GMT, Jim Davis wrote: I need IR's invisiblity . Perhaps a standard modulated TV receiver , fresnel lens , aluminum foil , and several LED's transmitting ? wrote: http://www.ramseyelectronics.com/cgi...ction&key=LTS1 Or you can modify a laser pointer and use a Radio Shack photodiode to trigger the relay pretty easily... I can send a schematic if you like... fazelock On Mon, 29 Sep 2003 01:24:17 GMT, Jim Davis wrote: I need a 30 foot outdoor IR beam "fence" , that closes a relay when the beam is broken . Thanks ... Jim |
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