I wish I had seen this when I needed a controlled ...

2009-08-11T06:19:40.947-07:00

I wish I had seen this when I needed a controlled relay for something I built the other day.

I ended up tying the DTR and RTS pins of the serial port together to run a small reed relay- when you bring them both high it produces ~5V.

It's a nice way of triggering a contact closure on the security system of our office building from trixbox for when I forget my pass :-)

Comments on Karosium: Relay on LPT port

I wish I had seen this when I needed a controlled ...