Transfer Data with Lasers?

[lasersbee]

@ MrGreenJeans....

Thanks for the interesting targeting info you provided...

and BTW...

to the Forum...

Jerry

 

[killmore231]

I actually did something like this a couple years ago. Used this link as the main source of how to set it up, and I sent stuff. I'm pretty sure it wouldn't be to hard to throw something together in C++ to get this to send files.

 

[lasersbee]

Just a quick look at that project brings up a flag that it may
not work...
The schematic has the transistors Base controlled through
Pin #5 of the 9 pin 'D' connector and Pin #4 to ground.

The 9 Pin 'D' connector's pin #5 is GROUND...:thinking:

And connecting Pin #4 of the 9 Pin 'D' to ground would
render this pin inoperative...
Have I missed something...:thinking:

Jerry

 

[killmore231]

Just a quick look at that project brings up a flag that it may
not work...
The schematic has the transistors Base controlled through
Pin #5 of the 9 pin 'D' connector and Pin #4 to ground.

The 9 Pin 'D' connector's pin #5 is GROUND...:thinking:

And connecting Pin #4 of the 9 Pin 'D' to ground would
render this pin inoperative...
Have I missed something...:thinking:

Jerry

I think that the ground may just be to the 9v battery ground. HIs site has a couple of things that are flip floped like that tho, so I'm also thinking that it may just be a mistake on his part, and pins 4 and 5 are swapped in his schematic. Honestly, im pretty suprised now that I look back that I even got this working using his guide. :thinking:

 

[Sk8freak315]

How about a laser mic?
http://www.wonderhowto.com/how-to/video/how-to-build-a-laser-microphone-77427/
You could use certain sounds to send certain data/bytes. But then interference comes into place. Maybe a box with a little speaker inside which will be the thing that the laser bounces off of. Different frequencies for different bytes would come out of the speaker. Then it would be just reading frequencies when it comes back and putting them back into bytes. But still there may be alot of interference, it would have to be tested.
Problem with this is flat out, light travels faster than sound. But we are mixing the two, so I'm not sure....

 

[drlava]

Hi guys, this is possible, I've been using a free space laser to transmit digital audio from my TV to the surround amplifier for a few years now. The bandwidth of s/pdif is about 6-8MHz. The receivers can be had for a few dollars and contain built in thresholding and AGC. Search digikey for a TOSLINK receiver. For the transmitter you can use a few digital logic buffer gates in parallel, driving a transistor biased to keep the laser just below lasing threshold with a logic 'low' and a few 10s of miliwatts at logic 'high'. I used a CRT color drive transistor but a 2n2222 array should work equally well.