vbSteve

Cool it worked! Thanks! ;D

Ah of cource, the Ohms Law, how could I forget that! :P Well I guess I will be using the phototransistor then :) Another thing, when I bundle the IR beam (using a lens or something) , is it possible to increase the range between the IR LED and the diode? Probably not relevant to my project now, but it's good to know :)

hmm, sounds complicated. So I have to treat it as a transistor? How many Ohms does the resistor need to be? And how does a receiver with 2 pens work? like a simple switch? Ah, sorry, just experimenting,see whats the easiest ;)

Hi, I'm new to electronics, well new, I mean I know the basic theory of electricity. You guys don't mind if I ask noob questions here not? I'm actually better at coding in Visual C++ and Visual Basic :) I'd like to know what influence an IR beam has on a photodiode, a diode with 3 pins. I'd like to light a green LED whenever the IR receiver receives. I have other intentions with it, but I guess this is the simple way of explaining. Eventually it will be used in a computer controlled doorlock, where when the IR beam is established, it returns "1" (= "closed/connected") to the parallel port. So what do I need to do in order to light the LED. Nothing to fancy stuff please. I search the net, but there is just so little information about it (Or maybe i was looking at the wrong sites) Here is image that might help: Thanks in advance.