28128 Parallax Inc, 28128 Datasheet - Page 122
28128
Manufacturer Part Number
28128
Description
KIT BASIC ANALOG/DIGI PARTS ONLY
Manufacturer
Parallax Inc
Datasheet
1.28129.pdf
(176 pages)
Specifications of 28128
Accessory Type
ADC, DAC
Product
Microcontroller Accessories
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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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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