Infrared Motion Switch needed urgently!

[tim_l_012]

Hi All

i need simple schematics to build a small infrared motion sensor, so when someone walks between a LED and the other wall, the path will be broken, and set off a buzzer.

If any of you have any plans that match this sort of descirption, or have any other questions, please reply with as much detail as possible!

Thanks in advance,

Tim.

 

[mozikluv]

sensor alarm

hi there tim,

i had that schem of what you really want, however i've forgotten where i have filed it, what i have now is anultrasonic intruder alarm which i preferred. it sends out 40khz signal and can cover 7' x 15' tear drop-shaped area. if you like this just email me, cant post the schem here its not mine, i dont know who the author is. to avoid legal complications i can send you the schem thru email. :wink: