Small-Range Motion Detector

This instructable will teach you how to make a small-range motion detector from cheap parts you can get at Radioshack. With this neat project, you can vary the brightness of the detector. This is my first instructable, so please mind the simplicity of the steps. Enjoy!!

Step 1 Materials

For this instructable, you can scavenge for parts at home and/or go to Radioshack and pick them up.

Parts:

- 1 LED
- Alligator Wires
- Set of Infrared Emitter and Detector (Radioshack #276-0142)
- 1 Small Enclosure/Case (About 3.5"x2.5"x1")
- 2 3V Coin Cells
- 1 PNP Transistor

Comments

[Kirbsome!]

I have a part that does this exact thing, it's called "ON1387" and I dug it out of a dead VCR.

[doc1tyler]

Thank you so much. I have tried for 10-20 hours to find out how to get these to talk to each other. Even tried 555 chip, built lots of other circuits but none worked. I knew this had to be sorta how to design it but have not done this stuff for 25 yrs.   The trouble I have had since I am so rusty is 1) the positive and neg parts of a circuit diagram hard to tell witch is witch. Label for us new guys :-)    2) you say the neg leg of the photo transistor but they call them C & E.  after carefull studying of your diagram I answered these questions.   I need this circuit to be a no contact switch for a fliud despensing system I am making. Thanks so much!!. doc1tyler  I almost gave up but you saved the day.

[Bongmaster]

its more a "tripwire" than a motion detector ;)

[crazycircuits]

Well, I guess so, thanks.

[Colonel88]

doesnt work, maybe because the circuit is the same as your remote control