Um...Me123 Posted January 1, 2006 Report Share Posted January 1, 2006 I need to make a driveway monitor that blasts a piezo indoors when someone comes in the driveway. (I am making this for someone) their driveway is maybe 1000ft. long or so. I figure I could have a IR led powered with a 555 and bateries on side and the other side could have the IR photo diode. Since I want to use just one 24 awg wire to run to the house (a radio signal strong enough sould be to hard od a project for me and probably use to much battery power) I may need a transistor with another battery(ies)? to transmit though all that small wire? Inside I want to use maybe another transistor with activate a 555 monostable to set off a 2 tone piezo.I need help on the schematic because I don't have experience with transistors. NPN PNP ?? ahhh!!!!!Thanks Quote Link to comment Share on other sites More sharing options...
ante Posted January 1, 2006 Report Share Posted January 1, 2006 Hi,You could get some ready made radio modules and perhaps a small solar panel this way you don’t need much wiring. Quote Link to comment Share on other sites More sharing options...
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