122-28176 Parallax Inc, 122-28176 Datasheet - Page 62
122-28176
Manufacturer Part Number
122-28176
Description
GUIDE STUDENT PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 122-28176
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Propeller Education (PE) Kit
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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