28129 Parallax Inc, 28129 Datasheet - Page 97
28129
Manufacturer Part Number
28129
Description
TEXT BASIC ANALOG & DIGITAL
Manufacturer
Parallax Inc
Type
Programmingr
Datasheet
1.28129.pdf
(176 pages)
Specifications of 28129
Style
Book
Title
Basic Analog and Digital
Contents
Basic Analog and Digital Text
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Not applicable / Not applicable
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Chapter 4: Basic Digital to Analog Conversion· Page 87
Why did I learn it?
There are many different “real world” circuits that require some sort of analog voltage.
For example, when you listen to a compact disc, you’re listening to sounds that started as
analog signals from a microphone. Then the signal underwent the A/D process when it
was digitized. The CD player then performs the D/A conversion using the digital
information on the CD. The analog signal is amplified and played on a speaker.
When designing commercial products, it is your responsibility to determine the most
appropriate (and cost effective) method to accomplish a given task. A resistive D/A
converter is a very economical method to get an analog voltage from a digital device.
How can I apply this?
You've just built a variable voltage source and a digital voltmeter on the same
breadboard. You also used some PBASIC Programming techniques to obtain information
about the converter using a voltage sweep. One application of this can be testing circuits,
but there are many others. In Chapter #5, we'll see how PBASIC can be used to control
the volume of tones emitted by a speaker. In Chapter #7, we'll use D/A conversion to
control the brightness of an LED transmitting a signal to a photoresistor.
The applications for D/A and A/D interfaces combined with a microcontroller are only
limited by one's imagination. These techniques can be applied to automated houses,
irrigation systems, rocket guidance systems, and robotics to name a few. Control systems
engineering is a field of study within electrical engineering that you might look into if
you find designing such systems interesting.
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