4Channel Xbee Sprinkler Controller

I built this simple XBee based sprinkler controller for my home automation system.  Its so basic there is no schematic.

The digital IO lines on the XBee to drive a few TIP120 darlington transistors I had in my parts box.  No extra logic or firmware required.

A salvaged power switch and IDC connector bring power into the box.  The large transformer and bridge rectifier are all it takes to power the solenoids.  A linear regulator and some caps feed the XBee.

Software wise, I’m just using a cron job to trigger a script that sets the XBee IO line state.

Closeup of the Circuit Board

Ready to close up

Finished Sprinkler Controller