![]() An even simpler version of the Scout would be featured in two Star-Wars themed Mindstorms sets as well. Instead of being based on the RCX, it had its own programmable brick called the Scout. The Robotics Discovery Set was a more affordable and simpler package than the Robotics Invention Set. Robotics Discovery Set and Droid/Darkside Developer Kit Since barcode is just a series of variances in light, this form of command entry was dubbed VLL (Visual Light Link) and has been used in several later Lego models. It is programmed by setting it to 'learn' and using the light sensor to feed barcoded commands. It features a single motor, a single touch sensor and a light sensor. This unit was the first programmable brick (or Pbrick). It talks the same protocol as the RCX but cannot communicate directly to it (due to IR vs RF) but with a repeater (a computer with 2 serial ports and a simple program) they can communicate indirectly. This makes it very useful for various mobile platforms and performing advanced motion/positioning tasks. The built-in tachometer and speedometer sensors on the internal motors provides the same function as the external rotation sensor to the RCX, but without using up sensor ports. ![]() ![]()
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