28123 Parallax Inc, 28123 Datasheet - Page 285

• 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

SUMMARY
This chapter introduced integrated circuits and how they can be used with the BASIC
Stamp. A transistor was used as a current valve, and a digital potentiometer was used to
control the amount of current passing through the transistor. Examining the digital
potentiometer introduced the reference notch and pin map as important elements of
electronic chips. The function of each of the digital potentiometer pins was discussed, as
well as the device’s internal structure. The PBASIC command
a means to save program memory.
Questions
Exercise
Project
Solutions
1. What are the names of the terminals on the transistor you used in this chapter?
2. Which terminal controls the current passing through the transistor?
3. What can you do to increase or decrease the current passing through the
1. Write a program that adjusts the tap in the digital pot to position 0 regardless of
1. Add a photoresistor to your project and cause the brightness of the LED to adjust
Q1. Emitter, base, and collector.
Q2. The base controls the current passing through the transistor.
Q3. Increase or decrease the current allowed into the transistor's base.
E1. To solve this exercise, look at TerminalControlledDigitalPot.bs2. The first thing
transistor?
its current setting.
with the brightness seen by the photoresistor.
it does, in the Initialization section, is to set the tap to the lowest position. This
exact code is used in the solution below.
' What's a Microcontroller - Ch9Ex01_SetTapToZero.bs2
' Turn tap on digital pot all the way down to zero
' {$STAMP BS2}
' {$PBASIC 2.5}
DEBUG "Program Running!"
TOGGLE
was introduced as