28123 Parallax Inc, 28123 Datasheet - Page 147

• Manufacturer Part Number: 28123
• Description: TEXT WHAT'S A MICROCONTROLLER
• Manufacturer: Parallax Inc
• Type: Programmingr

Specifications of 28123

• Style: Book
• Title: What's a Microcontroller?
• Contents: Whats a Microcontroller? Text
• Product: Microcontroller Accessories
• Core Processor: PIC16C57c
• Flash: 128 Bytes
• Operating Supply Voltage: 9 V
• Board Size: 31 mm x 16 mm
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Chapter #5: Measuring Rotation
ADJUSTING DIALS AND MONITORING MACHINES
Many households have dials to control the lighting in a room. Twist the dial one
direction, and the light gets brighter; twist the dial in the other direction, and the light gets
dimmer. Model trains use dials to control motor speed and direction. Many machines
have dials or cranks used to fine tune the position of cutting blades and guiding surfaces.
Dials can also be found in audio equipment, where they are used to adjust how music and
voices sound. Figure 5-1 shows a simple example of a dial with a knob that is turned to
adjust the speaker’s volume. By turning the knob, a circuit inside the speaker changes,
and the volume of the music the speaker plays changes. Similar circuits can also be
found inside joysticks, and even inside the servo used in Chapter #4: Controlling Motion.
THE VARIABLE RESISTOR UNDER THE DIAL – A POTENTIOMETER
The device inside sound system dials, joysticks and servos is called a potentiometer,
often abbreviated as a “pot”.
potentiometers. Notice that they all have three pins.
Figure 5-2 shows a picture of some common
Figure 5-1
Volume
Adjustment
on a Speaker