Author Topic: Transmitting Data Through Laser  (Read 2785 times)

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Offline MaltiKTopic starter

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Transmitting Data Through Laser
« on: November 12, 2008, 05:05:36 AM »
Is this possible to use a LDR on one microcontroller and a laser on another and when the laser hits the LDR 1's appear, and when it doesnt, 0's appear, does anyone know of a tutorial for this, its a very interesting subject.
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Offline arixrobotics

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Re: Transmitting Data Through Laser
« Reply #1 on: November 12, 2008, 05:41:33 AM »
I've done a project like this some years ago. But I transmitted analog signals instead of digital  :o

It's pretty easy really. What I did before was I connect a laser pointer to the audio-out of a radio, and an LDR to the audio-in of an amplifier. I can't really remember the exact circuitry, but it was probably just some transistors for a bit of amplification etc.

This setting worked perfectly indoors. The furtherst I tested indoors was like 5 metres, and there was very little noise.

I tried to do it outdoors during a party we had, but the laser beam was too small to see from a few metres. I had a really hard time trying to focus the beam exactly on the LDR. Since a party is not a party without music, I had to cancel my experimentation after a few minutes of trying  :(

I remembered seeing some tutorials on the web. There was this guy who managed to get his system working across the street. But he used a really big laser.

Google around!


Found this: http://www.instructables.com/id/Send-Music-over-a-Laser-Beam/
« Last Edit: November 12, 2008, 05:46:07 AM by arixrobotics »

Offline Half Shell

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Re: Transmitting Data Through Laser
« Reply #2 on: November 12, 2008, 08:16:42 AM »
Sweet project man. How long did it take you to write the interface for it (translating data to laser and then back to data again)?

Offline airman00

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Re: Transmitting Data Through Laser
« Reply #3 on: November 12, 2008, 10:03:28 AM »
there is no software involved with the laser music system , its all in the circuitry
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

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Offline ArcMan

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Re: Transmitting Data Through Laser
« Reply #4 on: November 12, 2008, 11:45:31 AM »
When I was in high school, I saw a LASER data transmission project.  If you can imagine this, on the transmission side, the guy glued a piece of cardboard to a speaker cone on edge so that the cardboard stuck out perpendicular to the speaker cone.  The speaker/cardboard were positioned so that it blocked the LASER beam when the speaker coil was not energized and unblocked it when the speaker coil was energized.  He would send a "high-speed" data stream through the speaker.  The receiver on the other end would then reproduce the data stream.

Offline izua

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Re: Transmitting Data Through Laser
« Reply #5 on: November 12, 2008, 11:53:47 AM »
check these projects:
http://ronja.twibright.com/
http://www.modulatedlight.org/

they give a decent intro on the subject.
Check out my homepage for in depth tutorials on microcontrollers and electronics.

Offline Admin

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Re: Transmitting Data Through Laser
« Reply #6 on: November 13, 2008, 02:51:35 AM »
Its actually really easy . . . hook up the outputs/inputs to the Tx and Rx of your mcu UART, and you're done :P

If you have a $50 Robot completed and a pocket laser handy, I bet you can get it working in under 2 hours (including any soldering).

Offline MaltiKTopic starter

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Re: Transmitting Data Through Laser
« Reply #7 on: November 13, 2008, 06:59:04 PM »
Its actually really easy . . . hook up the outputs/inputs to the Tx and Rx of your mcu UART, and you're done :P

If you have a $50 Robot completed and a pocket laser handy, I bet you can get it working in under 2 hours (including any soldering).

So, using the Laser as a transmitter, what do you use as a reciever, and LDR?
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Offline Admin

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Re: Transmitting Data Through Laser
« Reply #8 on: November 13, 2008, 07:59:48 PM »
Quote
So, using the Laser as a transmitter, what do you use as a reciever, and LDR?
Depends on the wavelength of the laser :P

Unfortunately an LDR is too slow for a receiver, as it takes up to ~10 ms to change resistance. I *think* the pen lasers also emit infrared but not sure. Try using an infrared LED receiver and see if you get a signal - LEDs take only microseconds to detect a signal.

 


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