Re: How to detect power cutout for PC?

Rene Tschaggelar <none@xxxxxxxx> writes:

> Emre Sevinc wrote:
>
>> Rene Tschaggelar <none@xxxxxxxx> writes:
>>
>>>emre.sevinc@xxxxxxxxx wrote:
>>>
>>>
>>>>I need a circuit that can detect when electricity goes out
>>>>and sends a signal to the serial port of my PC, so that a
>>>>program that continously listens to the serial port can
>>>>understand the situation and send a poweoff command to the
>>>>operating system. I already have a simple UPS but I need
>>>>such an extra circuit because UPS doesn't last for long.
>>>>I have two purposes:
>>>>1- Learn how to build such a circuit.
>>>>2- Save my PC from unhealthy shutdowns.
>>>>I have only beginner's knowledge of electronics
>>>>so any resource, URL, etc. that provides
>>>>clear instructions will be very useful.
>>>
>>>IMO, one of the handshake signal inputs of the
>>>Serialport is used for exactly that purpose.
>>>A decent OS already has a driver to listen to this signal.
>> My main OS at home is Debian GNU/Linux and if I can construct such a
>> circuit I think
>> it is not going to be very difficult to write
>> a program that listens to the serial port and
>> issues the shutdown command when it receives
>> some bit from there.
>> The main challenge for me is to construct
>> such a circuit.
>
> Detection of missing power is not that hard as
> long as you have some left. From the battery powered,

"From the battery powered"... you mean the circuit that
is going to be constructed?

> detect whether the secondary of the transformer
> is delivering power. EG, attach before the rectifyer

Hmm, first I have to learn what a rectifier diode is and what
is its specification.

> a diode plus an RC. As long as the RC is having voltage,
> there is line power.

You mean an RC circuit? Just a resistor and capacitor?
Or some specific RC circuit? What kinds of resistor(s)
and capacitor(s)?

--
Emre Sevinc

eMBA Software Developer Actively engaged in:
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