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Controlling Devices Through a Computer's Parallel Port
Posted on Thursday, April 10, 2008   •   Category: PC Circuits


This is a very easy and fun to build project that will allow you to control up to eight external devices through your computer's parallel port. You may for instance control different appliances such as lamps, computers, printers, tv sets, radios, music systems, air conditioners, air fans, garden sprinklers and anything else you can think of, all through your computer. You can do a simple test by connecting a LED directly to a ground and any PINs 2 through 9 of your parallel port. The voltage on the parallel connectors is around 4.5V but it drops to around 2V once you connect the LED. You may use a 100 Ohm resistor if you want to, but it is not necessary since the current is very low.

   Controlling Devices Through a Computer's Parallel Port

 

Build Accurate LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and reset function to make sure the readings are as accurate as possible ... [more]



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