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Home › Magazines › 2000 › December › Three Switches on One RCX Input

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Three Switches on One RCX Input

Published in issue 294, December 2000

One of the main limitations of the RCX module of the Lego Robotics Invention System is that only one switch can be connected to a given input. Even though each input has a measurement range of 0 to 1023, using an internal 8-bit A/D converter, the software works with only two states for detecting a switch: open and closed.If you use the standard Lego software, you will have to accept this limitation. However, if you use a different programming language, such as Visual BASIC, it is not that difficult to find a way around it.

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