the laser trip alarm I find this project absolutley great but I want to know if there is a way to make it so when the alarm is triggered i can be notified without having to look at the LED on the circuit board. so for example i have the laster and circuit board at the enterance to my house, and im in the basement 1 floor under, is there a way to make it so a light or buzzer is triggered where i am as opposed to upstairs?

NachoMahma10 years ago
. You could replace the LED with a small relay (don't forget the clamping diode). This might require the use of a transistor that will handle more current. . Or use a photosensor aimed at the LED.
astrozombies138 (author)  NachoMahma10 years ago
im really just getting into the tech world, woudl you mind explaining what a clamping diode, relay or a transistor would do?
. In this case, a transistor is just an electronic switch. It can also operate as an amplifier. . A relay will usually handle more current than a transistor and would allow you to drive a horn, bright light, etc. . When a relay coil is de-energized, a counter-EMF is produced that can damage the circuit. A clamping diode short circuits the counter-EMF.
in even simpler forms you put a diode across the coil of the coil in the relay (electronic mechananical switch that works with an electromagnet) so that it normally doesn't conduct. Whenever you stop giving power to the coil it will produce harmful stuff that will potentially destroy stuff like integrated circuits. The clamping diode is the normally nonconducting (any normal diode pretty much) that is places between the 2 pins of the coil. for example you would put a relay to a battery, it turns on. put the anode of the diode on the negative and the cathode on the positive. This way it doesn't conduct, but when you turn of the relay it'll absorb all of the harmful effects.