What's the simplest way to trigger a pushbutton or common grounded circuits from a computer, except from LPT1?

Hi every one, I have did a lot of searching on internet, and found lots of ways for control leds and eletric devices from computers. By LTP1, COM ports, and others most expensive ways, like using a usb->lpt1 true emulator to work ok on win7.

I'm asking if anyone know how can I control pushbuttons and eletrical devices, from the computer using a easy and cheap way, it can be anything, microcontrollers, usb port. I prefer the cheapest one of course. But any advice will be great.

If anyone need more details please just leave a message.

Thank you.

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adam 1015 years ago
At the radio station I work at we have a usb based set of relays that allow our automation software to turn things on. When activated it completes a circuit between two pins. you could run a wire to each side of a switch and wire that to the relays
Raziel_LOK (author)  adam 1015 years ago
Do you know the if that device is for sale everywhere? is it expensive, the software is free to use?

THank you.
I could not remember the name earlier but this is a link to the device I mentioned. As for configuring I am not sure, I have only used it inside of BSI's Simian radio automation system

http://support.bsiusa.com/FAQ/usb1024triggerkit/usb1024triggerkit.php

I quick search puts it at $100 -a bit spendy for a hobbyist but maybe you can find a similar product for less, after all, you don't need this many channels.
lemonie5 years ago
You did a lot of searching on internet, and found lots of ways for control leds and eletric devices from computers.
Didn't you find anything that looked like you could use it?
There is little point in asking the question without saying what you've already seen and do/don't like.

L
Raziel_LOK (author)  lemonie5 years ago
I know it looks weird , but LTp1 looks to be obsolete, and a usbltp1 that runs a perfect lpt port is to expensive, any other solution will do the trick.

I need to connect a signal and a ground by computer command just like a pushbuttom but the difference is that the computer press it for me.

COM port looks to have win7 support, so if anyone know a slution with this port or any other, will be nice.

Thank you.