On Wed, 13 Feb 2008, Ashley wrote:
> I just purchased my first embedded project. A TS-7200. In the manual
> it tells how to read the input of a pushbutton on DIO 1.
>
> How do I program the DIO to connect a flipflop so it can to ground an
> external 5 volt line.
>
> I guess what I am trying to say Is I wanted to connect the DIO to the
> DC power switch pins on a standard PC to turn it on/off.
>
> Schematics...Code...transistors chips.. any direction would be helpful.
>
>
> Thanks,
> -Paul
> e:pknific (AT) gmail.com
You'll need a transistor and a resistor.
The DIO ports run on 3.3v logic, not 5v so you can't connect them
directly.
instead, try this: dio -> 1k resistor -> transistor base, transistor
emitter -> ground, transistor collector -> pc power pin.
The ground will have to be common to both machines, and you'll have to
work out which of the 2 wires on the switch is ground and which is signal.
Since ATX motherboards use momentary pushbuttons, you don't need a flip
flop -
pcon () {on, usleep 10000, off}
pcoff() {on, usleep 7000000, off}
or similar.
You may be able to run the ts-7200 from the power supply's 5VSB output,
but check that the power supply is capable of more than 500mA on that
line.
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