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by briefly depressing button 2. While a previously stored set of steps is being played any joystick motions are ignored. If necessary you can abort play mode at any time by depressing button 2 again. When playback is complete, the program automatically goes back into free-run mode.
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There are a number of enhancements you may wish to add. One is to increase the number of steps per second. This is done by decreasing the value as follows:
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The value 256 is approximately one half of a second, so 128 would be a quarter second, 64 would be an eighth of a second, and so forth. Be aware that the smaller the number is, the more steps are recorded per second, so the 60-element array will fill up faster. Another enhancement is to add an additional joystick. The DB-15 connector is designed to accept signals from two joysticks at a time when used with a suitable joystick Y adapter (available at Radio Shack and elsewhere).
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I still remember the first television remote control I ever saw. The remote control, which looked like something from a 1950s sci-fi movie, was for a Zenith black-and-white TV , made circa 1962. The remote had just two functions: on/off and channel changing. To change the channel you had to keep depressing the channel button until the desired channel appeared (the channels changed up, from 2 through 13, then started over again). What was more amazing than the remote control itself was how it worked: by ultrasonic sound. Depressing one of the control buttons struck a hammer against a tuning fork. A microphone in the TV picked up the high-pitched ping and responded accordingly. These days, remote control of TVs, VCRs, and other electronic devices is taken for granted. And instead of just two functions, the average remote handles dozens more than the knobs and buttons on the TV or VCR itself. Except for some specialty remotes that use UHF radio signals, today s remote controls operate with infrared (IR) light. Pressing a button on the remote sends a specific signal pattern; the distinctive pattern is deciphered by the unit under control. You can use the same remote controls to operate a mobile robot. A computer or microcontroller is used to decipher the signal patterns received from the remote via an infrared receiver. Because infrared receiver units are common finds in electronic and surplus stores (they re used heavily in TVs, VCRs, etc.), adapting a remote control for robotics use is actually fairly straightforward. It s mostly a matter of connecting the pieces together. With your infrared remote control you ll be able to command your robot in just about any way you wish to start, stop, turn, whatever.
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Here are the major components of the robot infrared remote control system:
I Infrared remote. Most any modern infrared remote control will work, but the signal pat-
terns they use vary considerably. You ll find it most convenient to use a universal remote control (about $10 at a department store). Specifically, you want the universal remote to support Sharp TVs and VCRs 99.99 percent do. I Infrared receiver module. The receiver module contains an infrared light detector, along with various electronics to clean up, amplify, and demodulate the signal from the remote control. The remote sends a pattern of on/off flashes of light. These flashes are modulated at about 38 40 kHz in order to reduce interference from other light sources. The receiver strips out the modulation and provides just the on/off flashing patterns. I Computer or microcontroller. You need some hardware to decode the light patterns, and a computer or microcontroller, running appropriate software, makes the job straightforward. For this project we ll use the BasicX-24 microcontroller, from NetMedia. The same programming techniques described here can be used with other microcontrollers and computers, but you ll need to adapt the program accordingly.
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