computer controlled relay

I want to build a SIMPLE computer controlled relay. Not where u have the relay that is on when the computer is on, the kind where u have a program that has little buttons that u click to activate a relay.
Please help me!!!!!

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Its really easy. Here:



We also have Serial, Bluetooth, Ethernet, and several other communication interface options.

sci4me (author) 7 years ago
im back and gonna keep triing
I know this question is a few years old, but I've been looking through your profile and found it. If you're still looking for a solution, velleman do some nice kits. here and here, one of them is pre-assembled, and one is a kit and therefore cheaper (And more fun to build). Its a really great kit, if you are in the UK, you can pick it up in maplin, but if not, I think they do worldwide shipping. You simply connect it to a usb port, install their software, and you can control all the outputs with a simple button interface. They even have an iOS app so if you leave the pc its connected to on as a server, you can control the outputs on the go.
guyfrom7up8 years ago
does your computer have a parallel port?  if so, it's as simple as 1 resistor (for transistor), 1 transistor, 1 relay (duh), and one diode to protect your computer.  Software is also very easy, too.

If you want more in depth stuff, say you have a parallel port

there are other ways, but this is by far the simplist
sci4me (author)  guyfrom7up8 years ago
What should i do?????????????
the second easiest way: arduino
sci4me (author)  guyfrom7up8 years ago
how would i connect the paralell port way? my dad does have a computer with paralell port, i think.
sci4me (author)  guyfrom7up8 years ago
ok, now the problem is that i have no previous programming skills
better start learning! lol
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