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Picture of Keep Unwanted Visitors Away With a Motion Activated Sprinkler
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Do the local animals think that your front lawn is their personal toilet? Do ninja assassins keep trying to sneak into your house? Keep these unwanted visitors away with a motion activated sprinkler system. As soon as they step into your lawn, a passive infrared motion sensor detects the intruder and turns on the sprinkler to chase them away.

Step 1: Watch the Video

Here is a video of the build that I made for Make Magazine.

 
kaschlegel5 months ago
i finally got around to picking up the supplies for this project. i can't wait to start! There may be several of these on the market, but they're expensive and I would rather know how to make my own so I can modify it and add to it to fit my yard and my use in the best way. Thanks for posting this!

Brilliant! I wish I had thought of this first. I'd buy one...

There has been one on the market for years to scare away deer and other pests. Was/is marketed as the scarecrow. Only needs a 9v battery and a hose connected to it if I remember right.
epicalien1 year ago
Those are the same wire strippers I have!
MagicWood1 year ago

Are these motion sensors not also set to only activate at night?

You can get around that by applying a small piece of tape over the light sensor.
How much did you spend on this?
I got the motion sensor at a used building material store for $5. The sprinkler valve was $12. The fittings were $2 each. The rest of the parts (hoses, sprinkler and power adapter, connectors) I already had lying around my house.

So in total about $20.
Fliggerty1 year ago

This is hilarious! I just happen to have a spare valve laying around.... hee hee hee hee

This would be a great project to keep the dogs from roving into certain areas in the backyard....MUHAHAHA