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
Click here to download the full size of the above Circuit.
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...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: