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1  Forum 2005-2010 (read only) / Interfacing / Question about transistors on: February 12, 2009, 02:53:01 pm
Hello fellow Arduino users!

I am working on a project that uses an IR sensor to detect a signal from a universal remote and turns on/off a computer.  One of my concerns is activating the power switch for the computer.  I want to retain the stock functionality of the power button, but also be able to electronically activate it.

So far, I have 2 2-pin headers connected pin for pin to each other.  one being where you plug in the case switch (just a momentary pushbutton), the other header will plug into the motherboard (probably with wires, not the header itself smiley ), so when the case switch is pressed, it will connect the wires on the motherboard and voila, power!

Now, for using the arduino to connect the switch, I could use some type of relay, but that seems like overkill for such a small load (I can't imagine the motherboard uses much current to detect the power switch).  I think I can use a small signal transistor, but that would mean I would have to mind the direction that the circuit is plugged into the motherboard (because transistors can only flow current in one direction, if I'm not mistaken).  Here's a diagram:

My question: is there any way I can make a bi-directional solid state relay with basic components?  I have a bunch of transistors and diodes that will hopefully be able to do the trick.  thoughts?
2  Forum 2005-2010 (read only) / Interfacing / Re: Interfacing LED-driver on: December 31, 2008, 10:23:49 am
ah, I see.  I made some headway yesterday, actually.  It turns out I fried the first chip or it was faulty from the factory (probably the former).  I got the chip to print out some characters.  not the ones I wanted, but it prints something smiley
3  Forum 2005-2010 (read only) / Interfacing / Re: Interfacing LED-driver on: December 30, 2008, 07:21:21 pm
I too am having a similar problem using that display driver.  Roxlu, did you get it working?  It's a fairly old post, I was hoping you may have had some luck.
4  Forum 2005-2010 (read only) / Exhibition / Re: Arduino 3DOF Head Tracker on: January 06, 2009, 10:21:31 am
ah, don't worry about it then.  I used C# for some reason (Java programmer at work, I figured it was close enough smiley )  It's fairly simply anyway.

Thanks for the inspiration though, this is neat!
5  Forum 2005-2010 (read only) / Exhibition / Re: Arduino 3DOF Head Tracker on: January 05, 2009, 04:30:43 pm
Wow, this is very cool.  I recently got into Arduino boards, and electronics in general, because I wanted to make a few physical controllers for FSX.  I have since completed a switch panel for controlling things like magnetos, flaps, lights and fuel selection.  I'm currently planning out an auto-pilot interface with an LCD screen and some fancy light up buttons.  Would you mind posting the code you wrote to interface with FSX?  I'd like to compare it with mine to see if I could improve it.

Also, if anyone is interested, I could post some pictures of my build, perhaps in another thread.

6  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Question on Serial LCD on: January 21, 2009, 03:51:54 pm
I just got my 2x16 LCD working with my Arduino.  it's not the same one, but it looks pretty much exactly like the one you have there, with the same pinouts and everything.  Somebody correct me if I'm wrong, but it seems like most of the parallel displays out there follow this same type of connection, either 4 or 8-bit parallel data with RS, R/W and E lines and power connections.

I'd say you're probably safe.  make sure you pick up some male headers so you can connect this to a breadboard easily.

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