28176 Parallax Inc, 28176 Datasheet - Page 132
![KIT PARTS PROCESS CONTROL W/TEXT](/photos/8/99/89989/mfg_28176_sml.jpg)
28176
Manufacturer Part Number
28176
Description
KIT PARTS PROCESS CONTROL W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28176.pdf
(330 pages)
Specifications of 28176
Accessory Type
Process Control
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Note the period of the waveform. The time represented between each horizontal major
division, or dashed vertical line, is 2 ms. A complete cycle takes approximately 3.6
divisions.
Frequency is the inverse of period, f = 1/T.
More accurate readings are obtained by the software and displayed below the waveform –
133 Hz and 7.5 ms. How does the frequency compare to what the BASIC Stamp was
reading for a count of 1 second? Also note that the waveform does not go from HIGH to
LOW sharply. The rise and fall of the wave takes a finite amount of time (about 0.4 ms).
This is due to the time required for the encoder vanes to transition and the response of the
phototransistor.
Figure 4-21 Waveform of Phototransistor Output for 1 Cycle/Revolution Encoder
3.6 div x 2 ms/Div = 7.2 ms for the period of the wave (T).
f = 1/7.2 ms = 138 Hz, or the number of cycles per second (Hz).
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