low cost DIY laser shifter

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As an avid electronics enthusiast and hardware hacker, I annually attend a hacking conference in Las Vagas. Unfortunately due to college I was unable to go but Fortunately, my friends were able to make it and they went to some interesting presentations. Anyways I'm getting ahead of myself and I'll cut to the chase.

enter
NOTCHACOTCHA

A low-cost DIY microcontroller-based laser jammer solution that sends pulses of light back at law enforcement Lidar based guns. Notchacotcha Its based off an esp8266 which is really popular in the DIY electronic scene because of its ease of use with the Arduino IDE and Bluetooth capability. The circuit is hooked up to a voltage regulator to run the matrix and run off 12v cigarette charging port. Now It does come equipped with MIRT functionality which is SUPER illegal so use at your own risk. I will link the GitHub repository where all documentation and schematics are available. Tomorrow I'm actually going to raid the local Frys for all their LED matrixes because I can't wait to get this working and start testing this thing.

In conclusion. I believe that having access to low-cost laser countermeasures will greatly decrease the number of times you are hit with a laser which some people (myself included) simply do not have the luxury of owning a thousand dollar laser shifter setup. I would really like to hear everyone's opinion because I am totally psyched for this.

github link
DEFCON 27 presentation
 

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Saussie

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Why not? Try it. See how you go. Only one way to find out really and speak from experience using it. That usually overrides hypothetical speech. Always some extra variables in a real world scenario, so road testing will be the only way really.
LOL first thing... Make sure your cigg socket isn't buckled or warped, otherwise there goes your power. Might want to hard wire it for power stability. Other than this, I can't comment as I've no idea. Interested in it's ability though.
 

doubledge

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Well this is super interesting for sure. Can’t wait to see how your testing goes. I think the only concern I would have is how smart will this actually be able to be with regard to the more complex VPR guns? From your images it looks like it is simply using a brute force method to jam rather than matching the actual pulse rate of the gun. If so it’s most certainly going to throw jam codes on the guns which could be problematic. Exciting none the less. Keep us posted.
 

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Well this is super interesting for sure. Can’t wait to see how your testing goes. I think the only concern I would have is how smart will this actually be able to be with regard to the more complex VPR guns? From your images it looks like it is simply using a brute force method to jam rather than matching the actual pulse rate of the gun. If so it’s most certainly going to throw jam codes on the guns which could be problematic. Exciting none the less. Keep us posted.
forgot to add that you can just comment out code to suit the laser application. Also, the other thing I forgot to add is that you can wire up buttons to the I/O pins and cycle through the different modes that way. I could totally see people wiring led light-strips(or even light bars lol) in between their grill and tucking away the unit for a clean stealth install. Yeah and as for testing... I don't exactly have a lidar/radar gun collection like some of the older members on this board, so maybe someone in the Oregon/Washington area could help me test the functionality and report my findings.

current units supported.
-Ultralyte Non-LR
-Ultralyte Rev.1
-Ultralyte Rev.2
-Jenoptik LaserPL
-Jenoptik Laveg
-Kustom Prolaser3
-Kustom Prolaser2
-Kustom ProLite
-Stalker LZ-1
-Laser Atlanta
-Laser Atlanta Stealth Mode
 

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RedRocket

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If you live where exclusively only those Lidars are used you might have a chance. Otherwise, there are multiple Lidars not in your list that will eat you alive.
What does the IR beam pattern look like & what is the divergence measured in degrees ?
 

doubledge

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What exactly are the modes? Does that translate to the Lidar gun? If so having to manually select the gun to jam makes it useless.

As far as testing, there are definitely people by you that might be able to assist in testing. It would be interesting to see.
 

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It worries me that they are using a "940nm LED Array", police Lidar use 904nm.

I don't know the validity of this argument but they made it so the 940nm LED array can mimic the 904nm pattern.

Code:
  pinMode(LIDAR_EMITTER, OUTPUT);  // 940nM LED output (mimic 904nM laser diode)
  pinMode(CHANGE_MODE_BUTTON, INPUT);
  pinMode(TRIGGER_BUTTON, INPUT);
  Serial.println("start");
-- Double Post Merged: --
I'm just spitballing here but I could modify the code so the mode select can be displayed on the OLED display and cycle with the onboard buttons
 

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Jammernet

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I don't know the validity of this argument but they made it so the 940nm LED array can mimic the 904nm pattern.

Code:
  pinMode(LIDAR_EMITTER, OUTPUT);  // 940nM LED output (mimic 904nM laser diode)
  pinMode(CHANGE_MODE_BUTTON, INPUT);
  pinMode(TRIGGER_BUTTON, INPUT);
  Serial.println("start");
I'm always open to new ideas but as far as I know the wavelength is determined by the doping of the semiconductor and can't be changed by external factors. Will be interested to see how this turns out.
 

NTLGNC

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The infra-red output frequency of semiconductor opto devices is a bell-shaped curve and ideally the output is centred on 904nm, but as @Jammernet states there can be manufacturing distributions in output and where the centre frequency will be. As @RedRocket states, the beam angle will be a concern, but of greater concern is using LEDs rather than laser diodes. The output of the average infra-red LED is a lot less than the average infra-red laser diode, and also an LED's output beam angle is typically much greater. It might be possible to compensate by using an array of LEDs but I suspect that this will still not have the "punch" of a laser diode.
 

Saussie

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Needs truspeed on the list to get my full attention. But that's just me. The list may suit others, and generate interest for them, if there's something they face in it.
 
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Tb12

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Might work at short range, not going to be anywhere near focused enough (or powerful enough) for long range, especially in the sun. I imagine it will work great in bench testing but not real world.

Might be able to get it more functional with a bunch of aspheric lenses to help focus those LEDs though...
 

oktavf

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Nothing wrong with testing! I'm sure the first few jammers/RDs started out the same as a "crazy" idea, etc.! :drinking:
 

meismyname

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Might work at short range, not going to be anywhere near focused enough (or powerful enough) for long range, especially in the sun. I imagine it will work great in bench testing but not real world.

Might be able to get it more functional with a bunch of aspheric lenses to help focus those LEDs though...
Keep in mind that a lot of the older products from both Blinder and K40 were LED based, and they used far fewer LEDs. Not saying that those examples worked well, but they did okay with a lot of the older guns. With the number of LEDs in those pods, there's at least a chance it'll work decently.
 

Saussie

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Hopefully it blasts the gun tho. Imagine if you had something like this that frys the gun completely. Wouldn't have to worry about jam codes then haha! Once you pass the leo his device is just wiped and malfunctioned. Save everyone after you and he has to pack up and go home.
 

Fermy

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Lots of info in the thread, Maybe it should be bumped up to a higher level?


I am curious about this too! Time to do some research.
 

RedRocket

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It worries me that they are using a "940nm LED Array", police Lidar use 904nm.
If the wavelength is really centered at 940nm that would be a big issue. I don't recall the spectral bandwidth of the Opto-diodes in the "receiver" side of the Lidar gun, but being 36nm higher in frequency is a problem. I suspect the guns receiver will tend to ignore an infrared light so far off where it should be.
That would be like trying to listen to an AM/FM radio station but you've got the Tuner knob set in-between 2 different radio station frequencies. You're just not going to hear either one of them.

You MUST be close to exactly on 904nm wavelength +/- a couple nm for the gun to "see" the incoming IR.
 

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If the wavelength is really centered at 940nm that would be a big issue. I don't recall the spectral bandwidth of the Opto-diodes in the "receiver" side of the Lidar gun, but being 36nm higher in frequency is a problem. I suspect the guns receiver will tend to ignore an infrared light so far off where it should be.
That would be like trying to listen to an AM/FM radio station but you've got the Tuner knob set in-between 2 different radio station frequencies. You're just not going to hear either one of them.

You MUST be close to exactly on 904nm wavelength +/- a couple nm for the gun to "see" the incoming IR.
obviously, I'm not as versed in the physics of Lidar technology as you are. You mention that the LEDs must have a 904nm wavelength to work effectively. how would I go about changing the wavelength to satisfy this constraint?
 

doubledge

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You need the correct LED array meaning one that is designed to emit at 904nm. That part of the system is fixed. The software just fires the LEDs in the pattern according to the gun it detects is shooting at it.
 

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