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Could I use a PIR sensor as a hands free on-off switch like in 1960s SciFi movies? Answered

I like the idea of waving my hand over a little dome to turn on or turn off an a/c device. I know a PIR can be used to actuate a circuit for a time period, but don't want the thing to turn back off until I'm ready. I would like to use the PIR to toggle on or off switch for the circuit only when I wave my hand over the sensor bulb. I'm sure this can be done, but I am not skilled enough to figure it out without a little help. I want to turn on or turn off the light on my night stand next to my bed. I could build a battery powered LED night light, but I want to use the circuit to control the a/c powered lamp. I am guessing I'd need a solid state relay or something to handle the 110 volt a/c for the lamp. Any help?

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iceng

Best Answer 5 years ago

Yes you can.

Simply replace the lamp the with a Flip-flop that powers another light.

If you need a schematic, just provide the info or ckt of your PIR device.

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Purphekticeng

Answer 5 years ago

I think you've got a real good idea of what I'm trying to accomplish. A schematic would be really helpful. I scored a PIR device from Adafruit. Here is the link to the PIR. http://www.adafruit.com/products/189#Description
I would assume your idea includes the solid state relay suggested by jduff54?

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icengPurphekt

Answer 5 years ago

Here is a solid state circuit complete.
You could replace the opto and triac with a solid state relay.
The 4017 acts as a flilp-flop for the output of the PIR open collector.

PIR-017-OPTOISO-sw.JPG
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ariweeiceng

Answer 4 years ago

gooooooooooooooooooooooooood

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icengiceng

Answer 5 years ago

BTW This control concept was first seen by me in the movie
Forbidden planet and had Robby the robot
You can get a DVD of that wonderful movie for under $8.

RobbyRobot.jpeg
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Purphekticeng

Answer 5 years ago

Exactly! "Robby. I beamed you and beamed you. Where have you been?"

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icengPurphekt

Answer 5 years ago

Click Click Clack ..... sorry sir ..... hoping to get best answer !

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I am working with a project..to save energy and money...can anyone provide a in-expensive PIR Occupancy Sensor circuit? Thanks in advance...Philippines

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Hi I'm working with PIR sensors, can anyone provide a in-expensive circuit PIR Occupancy sensor? without using any micro controller...When there a presence of human, the PIR is always active/ON (e.g. Light Bulb) in case the human leaves from the area with PIR sensor, it turns off (Lights OFF)...This an alternative way to save power...Many thanks

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jduffy54

5 years ago

toggling the lamp might be a little difficult if you want it to be analog. If you don't mind microcontrollers, then you can use an attiny, and a very basic arduino program to monitor the PIR sensor and switch a relay accordingly. You could use this relay, or something similar, as long as it can take 120VAC and maybe half an amp. You will need a transistor off of the logic output of the microcontroller in order to switch enough voltage and current for the relay.

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jduffy54jduffy54

Answer 5 years ago

Sorry, forgot to put up the relay link: http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2077378_-1

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Purphektjduffy54

Answer 5 years ago

Thanks. I knew there had to be a way of doing this project. Just a matter of tapping on the shoulder of those with more experience. My wife doesn't see the cool facter, but then again she married me.