Python IR tracking for the handicapped

[Techb] had a friend who was paralyzed after an accident and could no long use a computer. He rigged up an amazingly simple mouse interface using python to implement infrared tracking. The controller was built from an old hat by adding an IR LED and wireless mouse modified so that the button could be clicked by the user’s mouth. A webcam with exposed film used as a filter can track the IR LED and take input from the wireless mouse buttons.

This setup, which draws inspiration from Wii Remote white boards,  is much simpler than the Eyewriter (and doesn’t shine an IR LED into your eye). Although [Techb] wants to add facial recognition to the system, there’s something to be said for such a simple implementation.

[Thanks Wolfmankurd]

RFID tracking system

[Nicholas] built an active tracking system using RFID tags. The system’s tags operate in the 2.4 GHz band and are used to track either people or assets. The readers are on a mesh network and can triangulate the location of any tag for display on a map. His system is even set up to show the travel history of each tag. [Nicholas] shared every detail in his writeup including some background about available hardware options and how he made his final decisions on what devices to use for the job. His conglomeration of software that ties the whole project together is also available for download.

Open source artillery

Thanks to [Josh, Kyle, and Mike], it is now possible to wage (Nerf) war with an Arduino. The turret designed around it is capable of shooting 6 foam projectiles in close succession, between reloads. The faux weapon interfaces with a computer through the Arduino’s onboard serial link (via USB). Software on the PC sends commands to the Arduino, which then executes functions, such as panning, tilting, firing, and rotating the cylinder. The power for the firing itself comes from a 5 gal, 80 psi air compressor. The Java software on the host PC also does smarter things, like show streaming video from the turret’s webcam and even performs basic object tracking (with mixed success). All the code for building the brute is available on [Josh's] website.

Perspective tracking with only a web cam

[Johhny chung Lee], eat your heart out. Check out what these guys are doing with face tracking and immersive 3d as their final project in class. They’re using a singe camera and an FPGA to produce the demo you see in the video. Facial tracking is done by skin color, so that might have some issues in some environments, but being able to have perspective shift with you, without rigging up some more hardware is fantastic.

We realize that this is completely different that what [Johnny] is doing. We love [Johnny]‘s work and think it is ground breaking to be able to pull this stuff off with a cheap game controller. We just couldn’t help but draw the parallel from the end result.

[thanks Bruce]

Alzheimer’s victims fitted with LoJack

alzheimers-tracking-watch

First it was for finding stolen cars, then keeping track of criminals, now Alzheimer’s sufferers are being fitted with tracking devices. This has been going on for some time now, but unlike the old tracking devices we’re seeing an update in technology to take advantage of the cell network for communications. The person wearing the device can be located using Uplink Time Difference Of Arrival or U-TDOA. This is the same technology that is used by 911 services to calculate the location of a cell phone.

Alzheimer’s is a frightening disease. The thought of a loved one wandering off with nothing to identify them and no recollection of who they are is a fear of every family dealing with the illness. There’s no doubt that this is a cost-effective solution that really works.

But from our perspective, can someone hot-glue a $3 Seiko to this thing? If you were designing this, would you even consider something that straps to your wrist and doesn’t have a clock on its face?

Update: Andrew corrected an error in the original post.  This system uses U-TDOA for location, not GPS.

Update: Jeremy works for LoJack and has informed us that the product in the post and the technology used have nothing to do with the LoJack brand of products.

Sticky light

light

With the availability of webcams and projectors, multitouch and interactive demos have become increasingly popular because they’re so easy. Students at the University of Tokyo took a new approach that uses lasers instead. They created Sticky Light, which uses mirrors, a laser, and a single photodetector. Unlike camera-tracking setups, this system requires no visual processing. The laser moves around and bumps into dark objects, sticking to them. It can follow drawings on the table or objects in space, such as shirt designs. They also created a few basic games and a demo that makes sounds based on the movement of the spots. Video of the project after the break.

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Plexi cliffhanger for trackmate

cliffhanger1

If you’ve ever wanted to play with tangible tracking systems quick and cheap, you might be interested in this super quick tracking surface for trackmate. Trackmate is open source software for physical object tracking. Making a surface for it isn’t that hard in the first place but this one is probably the easiest.  All you really need is some Plexiglas, some c-clamps and a web cam. The whole thing packs into a backpack or over the shoulder bag. This would be perfect for live performances.