28123 Parallax Inc, 28123 Datasheet - Page 148

• 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

Figure 5-3 shows the schematic symbol and part drawing of the potentiometer you will
use in this chapter. Terminals A and B are connected to a 10 kΩ resistive element.
Terminal W is called the wiper terminal, and it is connected to a wire that touches the
resistive element somewhere between its ends.
Figure 5-4 shows how the wiper on a potentiometer works. As you adjust the knob on
top of the potentiometer, the wiper terminal contacts the resistive element at different
places. As you turn the knob clockwise, the wiper gets closer to the A terminal, and as
you turn the knob counterclockwise, the wiper gets closer to the B terminal.
W
10 k
Pot
+
B
A
Ω
B
A
W
10 k
Pot
Ω
B
A
+
W
Figure 5-3
Potentiometer
Schematic Symbol
and Part Drawing
Figure 5-4
Adjusting the
Potentiometer’s Wiper
Terminal
Figure 5-2
A Few
Potentiometer
Examples