![](http://photos1.blogger.com/img/43/4435/320/GH-20AC-Controller.jpg)
Years ago, I built this controller to switch 110 volts with a printer port on my computer. I am adding a micro-controller so my computer will not be required in the greenhouse. Each one or all of the six A/C lines may be switched on or off.
Description of devices used to make growing more plants less work!
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