Spy Trakr: Wide Angle Lens (more)

A little bit more about the lenses and installation.

This is the 1.8mm lens installed on the board.

I had to make a custom lens holder and I made it a little loose. The lens would shift when I installed it in the TRAKR. So I manually focused it and dribbled Elmers glue into the threads overnight. Now it is sturdy enough to install in the 'bot.

These are 3 of the 4lenses I used (excluding the one I installed).

The TRAKR lens is on the right. It has a 9mmx0.5 thread on the lens. This diameter is less common, but not too bad. The screw holes on the lens mount (and the TRAKR CMOS) are 18mm apart. This lens has an IR filter built in. This lets 850nm pass and blocks the other IR frequencies.

The other two lens are from the Surveyor SRV-1 (basic on left, wide angle in the middle). These are both 12mmx0.5 thread lenses. Much more common size. The included lens mount is on the center lens. The screw holes on the lens mount are 22mm too big for the TRAKR.

So I built my own lens holder: 12mmx0.5 thread with a narrow 18mm base. Not hard, but I was sloppy (thus the glue)

Spy Trakr: Wide Angle Lens

I recently purchased a Spy Gear Spy Trakr. $80 R/C Tank with video camera that displays on the remote. It's claim to fame is that it runs Linux and is user programmable. Hackaday.com did a few good write-ups on it //hackaday.com/2010/08/27/spy-video-trakr-first-impressions/

Unfortunately, Spy Gear has stopped supporting it and taking the source code with it. Darn.

In the meantime, it is still a fun little toy. I drove it around the apartment, tough to navigate on the small screen. Just for giggles, I thought I would swap out the lens with a wide angle lens. I had 3 other lenses from work: 3.6mm, 2.2mm, and 1.8mm. (The Spy Trakr lens looks to be 3.6mm).

These lenses are 12mmx0.5 thread, very common; the Spy Trakr lens is 9mmx0.5 thread, less common.

This is an image with the default lens

This is an image with the 1.8mm lens

A top view of the kitchen, er... test arena.

The green line is 1.8mm and red is the 3.6mm.

The wider view and increased "peripheral vision" make the Spy Trakr an order of magnitude easier to drive.

A couple of notes about the 1.8 mm lens. It was labeled as 180-degree field of view. Clearly not 180 degrees. The fine print is that on a 1/3" imager it yields a full 180-degrees, but on the Spy Trakr 1/4" imager, we get 90-degrees. Again, still better than the 45-degree Spy Trakr lens.

A problem though, the wider lens needs A LOT more light. Thus my images are bad outside of natural sunlight. D'oh. External LEDs will fix that.