28129 Parallax Inc, 28129 Datasheet - Page 122
![TEXT BASIC ANALOG & DIGITAL](/photos/6/49/64954/mfg_28129_sml.jpg)
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
- Current page: 122 of 176
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Page 112 · Basic Analog and Digital
Now, try adjusting pot B and make the low signal two asterisks wide. What happened to
the pulse width? It should also have gotten narrower too.
Next, try adjusting pot B as far as it will go to increase the frequency (making the pulse
widths narrower). The piezoelectric speaker should be clicking pretty fast now. Carefully
adjust pot A and you should be able to hear an audible tone out of the piezo speaker. It's
not a pretty tone; it sounds about like a kazoo.
The Stamp-O-Scope 2 is probably not working very well any more, as shown in Figure 6-
6. We'll replace it with another program that lends itself to measuring audible sound.
Figure 6-6: Output Sample of Faster Pulse Train
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