This project makes use of an Arduino and some fairly simple electronics to trigger a DSLR when a person breaks a laser beam. This laser beam is password-protected and can be enabled and disabled using an iPhone/iPod Touch web app. It’s conceptually simple, and makes for really fun party games as well. The Laser In [...]
The good folks over at element14 sent me a really, really small OLED display for an upcoming project. The Densitron DD-6448BE-2A with the accompanying evaluation board. It’s a blue/black OLED screen, 64 pixels wide by 48 pixels high with good visibility and pretty decent contrast. It uses 3V logic, but needs a 9V supply to drive the display. Here’s [...]
Recently, I saw an impressive business card how-to that uses Persistence of Vision to display floating text. Take a look at it. I was considering the plausibility of a version of this card that can display the text and graphics in color. The basic mechanism (Persistence of Vision) is still the same, but the new [...]
This project extends a simple remote-controlled car, allowing it to be controlled by an iPad or by hand gestures. This project builds on the Arduino project, the Kinect and certain HTML5 features (WebSockets, DeviceMotionEvent, Canvas). The final product is this: Overview There are two different versions of this project – one for the HTML5 web [...]
Recently, the Minesweeper3D project was adapted into a web application for iPad – complete with multi-touch gestures and offline caching. It’s available here, with the source code here. iPad web application can be written to function remarkably like native applications. With the ability to keep a copy of the web app for offline use, web [...]
All modern browsers limit the number of concurrent connections that they establish with HTTP servers so that connections and devices are not overburdened. There are usually two limits: a cap on the number of connections to a host, and another cap on the total number of outbound connections. At the time the HTTP/1.1 standard was [...]
Recently, as part of my research, I implemented a modified version of the algorithm detailed in this paper. While it was unsuitable for the intended purpose, the process did yield interesting results in the form of three-dimensional color-frequency histograms. First, a quick introduction to the concept of a color space: Colors are usually described, additively [...]
Last weekend, a friend and I spent some time photographing laser beams. Laser beams are not directly visible in air, and so talcum powder was used to scatter light. The first such image (of two laser beams) was generated by taking a long exposure shot in a darkened room. Talcum powder was spread by a [...]
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