28123 Parallax Inc, 28123 Datasheet - Page 288

• 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 #10: Running the Whole Show · Page 281
Chapter #10: Running the Whole Show
SUBSYSTEM INTEGRATION
Most of the activities in this text introduce how to program the BASIC Stamp to interact
with one or two circuits at a time. Many microcontrollers have to handle tens or even
hundreds of circuits. This chapter will demonstrate a few of the techniques used to
manage a variety of circuits with a single microcontroller.
Programming the
microcontroller to orchestrate the activities of different circuits performing unique
functions is called subsystem integration.
The example in this chapter uses a sensor array consisting of two pushbutton circuits, a
potentiometer circuit and a photoresistor circuit. The activities in this chapter will guide
you through building and testing each subsystem individually. After each subsystem is
built and tested, you will then write a program that combines each subsystem into a
working unit. Figure 10-1 shows the circuit schematic for the system you will build, and
the master parts list is below.
Always remember: whenever possible, test each subsystem individually before trying to
make them work together. If you follow this rule, your projects will go much more
smoothly, and your chances of success will be greatly improved. The activities in this
chapter will guide you through the process.
Sensor Array Parts List
(4) Resistors – 220 Ω (red-red-brown)
(2) Resistors – 10 kΩ (brown-black-orange)
(2) Pushbuttons – normally open
(2) Capacitors – 0.1 µF
(1) Potentiometer – 10 kΩ
(1) Photoresistor
(5) Jumper wires