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Geoffrey L. Barrows's Blog (32)

Video summarizing current Centeye vision chips

I quickly put together this video to help clarify the differences between Centeye's current batch of vision chips. You can also download the slides below:…


Added by Geoffrey L. Barrows on February 15, 2011 at 1:20am — 2 Comments

Open Source Hardware (OSHW) Definition, version 1.0, has been released!

On the 23rd of September, early in the morning, I took a taxi from my home to National Airport (DCA) here in DC, and boarded a flight to Laguardia Airport (LGA). The airplane went up, then went down, and a short while later I was in a taxi, trying to find this "New York Hall of Science". The cab driver had no idea where it was, but with GPS we managed to find it. I met up with Alison, who lives in Brooklyn (she biked over; I had to fly) and we entered the Hall of Science to attend an event I…


Added by Geoffrey L. Barrows on February 12, 2011 at 5:30pm — 6 Comments

Formally kicking off two open source optical flow / vision sensor projects

I would like to announce two formal open source projects based on the optical flow sensor technology developed at Centeye. In both cases, the source code has been opened up under a modified FreeBSD license, while the board design has been released under a Creative Commons Attribution-ShareAlike…


Added by Geoffrey L. Barrows on January 19, 2011 at 5:30pm — 3 Comments

Make your own plastic mini lens, part 2


In a recent post I described some simple acrylic lenses I made using a simple press-molding technique. The methods were crude, but the results weren't too bad. Also, I had designed an assembly containing four minor variations of these lenses and submitted that for…


Added by Geoffrey L. Barrows on January 11, 2011 at 8:30pm — 2 Comments

Arduino Pro Mini optical flow sensor

This is a follow-on to an earlier post about an Arduino-based optical flow sensor prototype. Here I actually constructed a complete sensor that could actually be integrated into a robotic platform. To achieve a smaller size, I used an Arduino Pro Mini board from Sparkfun, and…


Added by Geoffrey L. Barrows on January 10, 2011 at 9:25am — No Comments

Make your own plastic mini lens

In my past experience, one of the most difficult parts of developing a tiny vision sensor is finding the right optics. Ideally we want something that is cheap, easy to mount, has a decent field of view, and yet creates a reasonable image. For higher resolution images (hundreds of pixels across or more) and image sensors four or more millimeters wide, there are many…


Added by Geoffrey L. Barrows on December 22, 2010 at 7:00am — 2 Comments

125mg TinyTam sensor, Part 2: Construction of the sensor

You've seen our previous post describing our TinyTam 125mg optical flow sensor prototype. Now we show you step-by-step how it was assembled! We hope that some of you find this interesting, and get a sense of what is involved with working with bare chip die an electronics at this scale.

In this first… Continue

Added by Geoffrey L. Barrows on November 12, 2010 at 6:16pm — 2 Comments

Printed optics- light, cheap, and wide field of view

This post describes the printed optics used on both our CYE8 sensors and the 125mg sensor prototype. This technique allows the construction of optics that are extremely light and support a wide field of view (approaching 180 degrees), and where resolution and sensitivity are not the highest priorities. This technique can be applied to practically any image sensor with exposed silicon- it will not work as well if… Continue

Added by Geoffrey L. Barrows on November 10, 2010 at 1:30pm — 1 Comment

Arduino optical flow sensor (fun and rough prototype)


Added by Geoffrey L. Barrows on November 2, 2010 at 12:00am — No Comments

125 milligram optical flow sensor "TinyTam"

As an exercise in size reduction, we have prototyped a complete optical flow sensor in a 125 milligram and 7mm x 7mm package. This mass includes optics, image sensing, and all processing. Above is a video and a close-up photograph. In the video, note the green vector indicating measured optical flow as a result of image motion.

Image sensor: Centeye Tamalpais… Continue

Added by Geoffrey L. Barrows on November 1, 2010 at 2:30pm — 18 Comments

Having fun: Connecting an Arduino with a 16x16 Tam chip

Recently I bought an Arduino board (to see what the fuss was about) and decided that a good first project would be to hook it up one of our Tam image sensor chips and see if we can pull an image off of it. The results below represent about three hours of playing around.

The Tam chip is the simplest image sensor chip we have designed. We fabricated two…


Added by Geoffrey L. Barrows on October 19, 2010 at 9:30pm — 5 Comments

Some eye candy for you...

These are all just rendered of course.…


Added by Geoffrey L. Barrows on October 14, 2010 at 11:00pm — 4 Comments

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