Motion Activated Indoor Wind Chime

1,272

8

About: I am an American teaching English at Shangluo University, Shaanxi. I like making machines that do interesting but fairly useless things - I call them Quixotic Machines.
I wanted a wind chime that would work indoors and triggered by movement. So I wired a PIR (infrared motion sensor) to a 2n7000 MOSFET transistor and to a fan composed of a 5 volt motor I salvaged from an old dvd drive and an RC propeller.

Here is video of it in operation:

Photo 1: shows whole wind chime mechanism. Chime holder is a cigar box with curtain rod holder holding a section of broom with acrylic ruler clamped to the broom handle with a paper c clamp.

Photo 2:  motor held in some packing foam with attached propeller from an RC airplane. Probably a simpler fan would be to use one of those baseball hat solar powered fans. What is important is to use a motor that has low current draw - around 50 milliamp. If you use a 300 milliamp motor the transistor will not be able to start the motor and the batteries will not last long.

Photo 3: shows transistor wired to PIR, negative battery and one of the motor terminals. Transistor Drain, Gate and Source are indicated in the wiring schematic. You might be able to use a simple NPN 2n2222 transistor if the motor doesn't draw much current. Didn't use circuit board as only had two components. I plugged the PIR into the wiring harness I also salvaged from the DVD drive. Lots of good parts in those drives.

Photo 4: shows PIR motion sensor which uses 5 to 15 volts.

Photo 5: shows wiring schematic. Note: should probably use a diode wired across the motor terminals to protect transistor but it seems to be fine when using low current motor without it.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Be the First to Share

    Recommendations

    • CNC Contest

      CNC Contest
    • Make it Move

      Make it Move
    • Teacher Contest

      Teacher Contest

    Discussions