28129 Parallax Inc, 28129 Datasheet - Page 122

• Manufacturer Part Number: 28129
• Description: TEXT BASIC ANALOG & DIGITAL
• Manufacturer: Parallax Inc
• Type: Programmingr

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

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