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RCX-based Multiple RCX Remote Control (demonstration) An RCX-based remote control unit can be used to send the numbers, with RIS code. Light sensors can be used to select the number to be sent, by detecting different colored bricks, and using the range of values to branch to a given number to be sent. One light sensor will control one motor or combined function (white/grey/black - forward/stop/backward or left/stop/right, needing two input channels). Touch sensors can be used, but because of the numbers needed, a touch switch port expander is needed (to allow one switch for forward, one for backward, one for left, one for right, no switch pressed for stop, using four input ports). This was just a demonstration project for us, due to how many RCXs could be required. However, the LEGO Company could easily produce a remote like this at a modest cost (combining a GamePad-style controller and a four-channel selector), and expand the market for Mindstorms (hint, hint!). RCX and dual light sensor remote control The left lever controls forward/reverse (lever forward=forward, lever mid=stop, lever back=back), and the right lever controls left/right (lever forward=left, lever mid=no turn, lever back=right). If no lever is engaged, stop is the default action. The levers rotate a gear engaged with a rack gear, which moves a beam covered with colored tiles (white/grey/black) to indicate position through the light sensor. This remote has not been optimized for actual use, but just built as a demonstration of the concept. It pulses the robot, due to constant resending of signals.
Dual light sensor remote control Single light sensor joystick
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