all you technical wizards

ikillbears

ikillbears

ikillbears

Soldato
Joined
5 Feb 2006
Posts
3,524
Hey Chaps,

I have an electronical question for you all. Im trying to build a little audio device to remind people to do something when leaving a room. namely turning off the lights. I could probably bolt together something which makes a sound based off my good old electronics GCSE but does any one know of a product which i can record or put on my own sound file etc. Are there any easy homebrew esc products which can pick up motion detection or any thing like that. the project is to remind people to turn off meeting room lights. Oh and it would be smashing if it was cheap as chips.

Answers on a postcard. Or you know. Here. :p
 
Motion sensor (a simple security PIR will do), plus an arduino :p

www.arduino.cc


/edit - To go into more detail I suppose... A motion sensor is essentially just a switch. The Arduino is a prototyping platform that is cheap, open source, and simple to program. It should be as simple as wire up the arduino to the PIR and perhaps an LDR as well (so that it can tell when the lights are on), program it so that when both motion and light are detected, it turns on your output device. Or alternatively, you could have it so that when motion isn't detected it turns off the lights (again, pretty simple, even working with 240v). Alternatively, you could buy one of the many bespoke products that already serves this purpose, but DIY is fun :D
 
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So you'll create a gadget which is electrically powered in order to save power?

Poster on the door "turn the ******* lights off!". and low energy bulb. Job done
 
Break the circuit of the "On" part of a light switch, attach a small circuit between, add a pressure pad and an audio device on the board.

Cheap as chips.
 
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