Automated Power Switches

created:17 Oct 2009 @ 05:41 pm
edited:17 Oct 2009 @ 05:46 pm

While I was browsing the SparkFun website (as you do), I stumbled across a PCB they have made that allows you to control a relay using a logic output. This reminded me of a project I have wanted to do for quite a while!

Normally this would not be possible as the logic outputs of micros only provide a small current (between 4mA and 40mA) which is not enough to energize the relay coil and bring the contacts together (which takes around 150mA).

I have rigged up an XBee and the relay PCB, and now I'm able to wirelessly switch mains voltage. YAY!

I intend to make a modular switching system that will be controlled by a central PC. The main aim is to reduce energy consumption by 'unplugging' (or disconnecting) computers and screens while they are not in use. Another side of this project will allow me an amount of security (This will be detailed later).

Check back for more soon!