LPT circuit switching

Question

Is there a short tutorial describing simple, low voltage circuit switching using the LPT port?

I know it could be done using USB or RS 232 relays, but I would like to assemble it with (buying) minimum or none electronic components, except things I have: an LPT cable, a LED diode or a fan, and a 12 V adapter.

"a LED diode or a fan" How can you have one or the other? Is this a student project, perchance? — HikeOnPast, Oct 29 '12 at 20:35
Yes it is, although I'm not a student, or is this homework or test. — JJ_Jason, Oct 29 '12 at 20:37
Where do you even find a computer with a parallel port these days? — Theran, Oct 30 '12 at 16:57

JJ_Jason · Accepted Answer · 2012-10-29T20:56:59.443

2

This is one way:

Parallel Port Controlled LEDs

edited Oct 29 '12 at 20:56

answered Oct 29 '12 at 20:38

JJ_Jason

164
8

by copying inpout32.dll you'll opening your door to many bad things. – Standard Sandun Oct 29 '12 at 20:52
5

Would you mind elaborating? – JJ_Jason Oct 29 '12 at 20:56
Source code for that DLL is freely available. You can check it and compile yourself, if you are concerned with safety. – Al Kepp Jan 27 '13 at 23:28

LPT circuit switching

1 Answers1