Homemade laser motion sensor

[forevaclevah]

converting monochromatic photons to polychromatic photons. can you calculate the efficiency of this conversion?

[SJefferyWilliams]

Hi, do you think it would be possible that this design of blocking the laser to trigger the light to switch off could be used as the base model of a 'laser harp'? Could be a good project?:-)

[TheMegalucian]

how did you make it to let the current pass if the light isn't shining???? shoudn't the diode let the current pass ONLY if the light is shiing??? plz answer

[k0b0yash1]

could use a noise maker instead of another LED?

[CognitiveNetwork]

So everyone working with IR motion sensors are adults, but when I search for DC motors only kids show up... why?

[shashwatssanghavi]

Thats A Simple Optocoupler

But it's cool

[Prodigy319j5]

thanks.



[preet319]

@caiolagana can use ldr for the same????????

[urfaceisnotavailable]

how would you do the same thing with a buzzer? like an alarm? as in if the lazer is blocked the alarm rings?

[vov35]

@urfaceisnotavailable

you'd need a transistor to invert the output....

the diode would go between the ground and base, and a fixed resistor between the base and Vcc. you would then hook the buzzer such that current for it must pass through the transistor.

[CampNextDoor]

great video but can you show how to make an easier one?

[SharukGuitar]

what is that a led or a infrared thing?

[mrrarekip]

can you maked witch sound ?

[28mrunal]

Which transistor should we use

[MrPsyco32]

check out mine least its inexspensive not to mention very simple why build it if its more complicated then buying one

[JotMaks]

I like it. It's as magick.

[kikaro11]

Is their any way to have it work the other way?

If something is blocking the lazer it then turns on the led?

[caiolagana]

@kikaro11 yeah I guess it is possible, but you might use a transistor to do so

[ithomas087]

@caiolagana hi i have a question what voltage is going to the photo resistor/led and is there a resistor if so wha voltage

thanks

[forevaclevah]

@kikaro11 the beauty of this is that the light from the laser is what is powering the led. to have it work the other way around you would need some kind of energy storage device.

[ledzeppelin7510]

secret agent laser obstacle chess here i come

[001madone]

has anyone else actually built this and it worked,becus ppl will but bs on youutbe sometimes

[muddymuddymuddmann]

opto coupler

muddY

[CanadaIndieFilm]

EXACTLY what I was looking for.

[EvendimataE]

what is the specs of that photodiode?

[EvendimataE]

this is exactly what i need......im thinking of building a target for pistol dry firing using laser..ther is one available but its $300 i think

[roger170892]

Is it possible to turn on one led if i shine, and turn on another led if i don't shine?

Do u know how i could do that?

[caiolagana]

@roger170892 I think it is possible. maybe you should use a transistor

[hirampr21]

@caiolagana i want to know how much could be the range of a laser? how far? thanks...

[caiolagana]

@hirampr21 maybe up to 20 meters...i haven't tested

[chuchuchuxor]

@roger170892 use logic gates

[cooperm123]

could you wire this up for something audio

i.e music plays with lazer on and then off when lazers off.

or

[cooperm123]

could you wire this up to something audio

[Zaharkl]

how can i make a toggle. so i shine on it one time and it stays on then i shine and it turns off

[caiolagana]

@Zaharkl i think you may need a more elaborated circuit to do this

[Zaharkl]

@caiolagana do you think you would be able to?

[caiolagana]

@Zaharkl maybe...it would be possible to use my PIC18F microcontroller kit to do this task....but sincerely nowadays I'm very busy :( try to do yourself :) pic18f.com

[Zaharkl]

@caiolagana i have no idea on any of this building things. im completely new i dont know how to do anyhting. where did u learn?

[caiolagana]

@Zaharkl well, one must start from somewhere... you already have the motivation! I actually have learned by myself

[Zaharkl]

@caiolagana well, what are some good tutorials or stores where i can buy things online etc. videos

[mrmjordan]

@Zaharkl I recommend "Make - Electronics: Learning Through Discovery" by Charles Platt.

This book teaches the basic concepts of electronics in a very interesting and easy to understand way. You can either buy a copy or google "make electronics rapidshare"

[Zaharkl]

@mrmjordan thanks

[Tomi852]

@Zaharkl Google is your friend, Wiki is your girlfriend

[insAneTunA]

Simple but effective, great video. It could even be used with some tiny mirrors if you want to change the path from the laser beam. For example if you want to make a fishpond protecting system.

[KrunchyGoodness]

i wouldn't say its a motion sensor, its more of a laser trip wire. a motion sensor would shine light through an entire room, receive all the reflected light, and if the reflection's frequency changes it triggers. kind of like a speed gun

[kikaro11]

@KrunchyGoodness mirrors can solve most problems

[kikaiden]

hey what is that device you attach the photodiode and LED to?

[kikaiden]

hi i am trying to make this sensor, may i ask what kind of photodiode you use?

what is the white piece of board you connect the LED and photodiode?

[xmin111]

hey dude was that a ir led or a photo diode?

[caiolagana]

@xmin111 photo diode (the white one at the end is a normal led)

[vik95170]

logic

[voon100]

This is what I'm looking for, perfect trigger application for a mouse trap, although be a good idea to change to Infrared laser diode instead.

[playfsx]

it is great video !!! 5* :-)

[Armin3322]

could you also use a green laser ? because the distance of them is much more better...

[caiolagana]

You can use green laser, it will depend of your light-sensor, but in general the sensor is sensible from 190 to 1100 nm of wavelenght, and the green laser have 532 nm of wavelenght.

[votolibreysoberano]

What do you recon is the maximum distance can you put between the laser pointer and the photo diode and still get an accurate motion detection?

[caiolagana]

I don't know, but I think it is about 10 meters...

[longhi328]

hmmm, try to use sound signal in your laser end a sound aplifier in your photo diode

[drakukha]

good job!

[SerafiMan]

Simple but good exemple!