[Cialug] Pressing a button remotely

[Zachary Kotlarek]

On Jan 28, 2009, at 3:20 PM, Nathan C. Smith wrote:

> Yes doing it yourself is part of the fun.  And Parallel printer  
> ports are harder to find these days (no, I don't want your old  
> Pentium)

Your serial port, or your USB->serial port, has some current available  
on the flow control pins. It's not a lot of power -- a typical max is  
50ma per pin -- but since you're only looking to drive a solid-state,  
low-output-current relay it should be sufficient (if you size the  
components correctly). And you could hijack the USB line for more  
power if you're using a USB->serial adapter and were willing to build  
a slightly more complicated circuit.

	Zach

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