# laser command circuit

Posted on Feb 5, 2014

Laser Command is a game which I build using a 8x8 matrix LED and an Arduino Mini. This game was developed as a `sample` class project in S10-05833 Gadgets, Sensors and Activity Recognition in HCI. The class is taught by Scott Hudson at Carnegie Mellon University, and I`m doing TA for the class. The name `Laser Command` comes from an old game called Missile Command. In Missile Command, you are

asked to shoot enemy`s missiles using missiles. In Laser Command, you shoot using laser, i. e. , a laser pointer. The most interesting part in this game is that the game uses a laser pointer as a two-dimensional input device in conjunction with a matrix LED. Here are a video, explanations of how it works, circuit diagrams and source code. I hope that these are enough for you to replicate and/or build on the technique :) In the followings, I will explain how the two techniques work using a simplified example shown below. The example consists of two digital ports (D0 and D1), two analog ports (A0 and A1) and four LEDs, i. e. , a 2x2 matrix LED. The first technique is well-known technique for using LEDs as light sensors. In this technique, we charge LEDs by applying reverse bias, and, then, measure how quickly the charged current leaks after stopping the reverse bias. In the example here, the technique works as follows: The time required for the leakage to discharge the LEDs is inversely proportional to the brightness. So, if D0 becomes LOW quickly, we can know that one of (or both) the LEDs at the top row is pointed by a laser pointer. Likewise, if D1 becomes LOW quickly, the LEDs at the bottom row are pointed by a laser pointer. This technique is sufficient if we just want to use a single LED as a light sensor. But, it is not sufficient if we want to use a matrix LED as a light sensor array. As described above, we can...

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