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I think you are right that it is looking for more than just whether the laser is on. It's possible it is additionally timing the laser against the diode response to calibrate the image.

An update in case anyone is interested in hacking these things. The thing labelled DS1 at the top middle of this image is quite important. It appears to be a set of photodiodes tuned for different wavelengths. The last dichroic mirror is actually a beamsplitter. A small percent of the red...

Re: Testing the Microvision SHOWWX Laser Pico Projector I've been running them without batteries. The original SHOWWX allows that at least.

I managed to swap the red diode for a 780nm one. It lights up along with the blue and green for a couple of seconds and then it fails some self check condition, the red LED starts blinking, and the projector shuts off. I'm not sure what to do now. The projector is apparently very thorough...

Thanks for the info about the 3.6mm. I found a CD-RW drive that I scavenged what I assume is a 780nm out of, so until I burn that one out, I'm set on 5.6mm. Edit: Forgot to describe what my intentions are. My plan is to do invisible structured light scanning with a SHOWWX. I'm going to have...

I'm new to this whole laser thing, so I don't have a pile of diodes scavenged from drives yet. ;) I'm looking for laser diodes in the 50-100mW range, preferably near 90mW. 780nm - 940nm, preferably at the lower end. 3.5mm or 3.8mm would be ideal, but I understand those are not a normal size...

Film and floppy disc material works decently well, but getting a narrower filter around the wavelength you want works better for rejecting sunlight. Imagine having a white box on a table with the scanner/projector pointed at it. You can project whatever you want to onto the box, making it look...

The PS3 Eye can take in a frame sync signal. I can try to harness the VGA V-sync signal for this, with a microcontroller as an intermediary to get the proper timing. I have a PS3 Eye modified to remove the IR filter and add an IR bandpass filter.

I want to do simultaneous structured light scanning and projection. That is, something like this video, but projecting back onto the things being scanned in real time (for slow values of real time). I was planning on having the structured light pattern constantly iterating in infrared while...

As a note, it appears that mirror is actually a cold mirror. 940nm infrared passes right through it. I was thinking about replacing the red diode with an infrared one, but it seems I would have to replace that mirror too.