To Zigbee or not to Zigbee. Is that a question?

[rcjordan]

Visonic MCT-340 E Contact/Temperature Sensor can be found for $15-ish. I picked up a couple for $11 each + free shipping (shoulda bought a dozen at that price). Also, we have a hack

DIY Wired Contact Hack Using Visonic MCT-340 E

After looking, unsuccessfully, for an off-the-shelf Zigbee device that would sense and report the state of mechanical contacts---relay contacts, simple pushbuttons, etc. I decided to make my own from a Visonic MCT-340 E. It's a "supported,'" relatively low cost magnet sensor used for doors, windows and the like. 'Turns out it is also quite easy to hack. (See photos.) [sensor%20hack%20small] [sensor%20hack%20PCB%20Small] Remove the battery cover. Pry off the rest of the rear cover. (Use a …