28176 Parallax Inc, 28176 Datasheet - Page 62
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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In the CdS (Cadmium Sulfide) photoresistor, light photons excite electrons and allow
them to flow more freely. This in turn changes the resistance. As light level increases,
resistance decreases. In our case, as we shade the photoresistor, its resistance increases.
A greater voltage is dropped on the bottom half of the voltage divider (from the wiper to
Vss). When the voltage drop to ground increases above the threshold voltage, the BASIC
Stamp senses P8 as a logical HIGH.
√
Cast a shadow over the the photoresistor. What happens to voltage? When does
your light energize?
Figure 3-4
Photoresistor Added
to Potentiometer
Portion of the Circuit
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