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Robot Building for Beginners by David Cook

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Chapter 14. Variable Resistors

The brightness sensors and balancing dial at the front of Sandwich are variable resistors. In this chapter, you'll learn about variable resistors and you'll prototype the first portion of the line-following circuit. Along the way, you'll run across techniques for simplifying schematics.

Thus far, the resistors you've experimented with have had fixed values. That is, their resistance stays the same all the time.

For the LED power indicator circuit, the brightness of the LED is based on the value of the resistor installed. To change the brightness, you need to remove the resistor and replace it with a resistor of a different value. It would be nice if the circuit had a resistor that could alter its value so that you ...

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