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From: "stellite" <1newsATstelliteDOTmailshellDOTcom>
References: <firstname.lastname@example.org> <2fMx9.160$tQ1.email@example.com>
Subject: Re: Urgent help needed to blank monitor
Date: Tue, 5 Nov 2002 08:57:42 -0500
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Here are 3 web sites that have circuits for parallel port relay control. The
last is the google link to many more sites.
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"Ulrich Peters" wrote in message
> Hello again.
> I think it might be best to expect a certain bit pattern on the parallel
> port, to get one logical high (or low) to control the circuit, because
> the serial port is already in use by a bill acceptor, and the sound card
> is used to provide acustical feedback to the user during the normal
> operation of the software.
> Although a 555 timer could be used to create a delay to switch on the
> monitor, I prefer to use the parallel port solution, because I would
> have control over the shutdown process as well. The equipment has a
> button on its back to power down the equipment. Before my software shuts
> down, the last thing it could do is quickly send a new byte to the
> parallel port, turning off the monitor, before Windows shows its usual
> shutdown dialogs ("saving settings", "closing connections", etc.).
> Unless you send new data to the parallel port, the last byte sent
> If somebody could just tell me how to control the coil of a 5V reed
> switch, probably using a simple BC5xx transistor and a couple of
> resistors, controlled by a logical H or L of the TTL output - I think
> then I would have all I need. Could you specify this circuit?
> Thank you again,
> In article , info@pcs-nooo-spam-
> electronics-nospam.com says...
> > A solution requiring no hardware modifications inside of the PC case
> > might be preferred. He could get the 5V from one of the ports.
> > Another solution would be to play a DTMF sound (if this PC has a sound
> > A simple DTMF decoder could than turn on the monitor.
> > You could even setup windows to play that particular DTMF (wav) upon
> > > Yes, and the duration (and sometimes the states) is consistent each
> > > it boots. I'm thinking it might be easier and just as effective to
> > > a 555-timer configured as a one-shot to provide a delay equal to a bit
> > > more than the computer's boot time. Just trigger it from the +5V
> > > to the mobo and have it operate a relay on the monitor's input power.
> > > Someone already suggested this, and I think it may be best.
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