Just ran across this site. Might be old news to some. If you need to control relays from your computer, try this: http://www.sainsmart.com/sainsmart-4-channel-12-v-usb-relay-board-module-controller-for-automation-robotics-1.html?kpid=171_en&gclid=CjwKEAjwxKSoBRCZ5oyy87DimEcSJADiWsvg6qOUkSFIgDS4mWGJUWTSlCo9nN9zlxf9OYss_yGv5RoCPOvw_wcB
They have a variety of relay modules for different voltages, number of relays, etc. Also lots of other handy little boards to work with RPi, Arduino, etc. Have fun, Michael
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