28129 Parallax Inc, 28129 Datasheet - Page 159
28129
Manufacturer Part Number
28129
Description
TEXT BASIC ANALOG & DIGITAL
Manufacturer
Parallax Inc
Type
Programmingr
Datasheet
1.28129.pdf
(176 pages)
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
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Under brighter light conditions, the resolution is poor. You can replace the 1 µF capacitor
with a 10 µF capacitor to increase the resolution at higher light levels. For full sun, some
kind of shade for the photoresistor would help. If you are dealing with low light
conditions, use a 0.1 µF capacitor instead.
The reason for using different capacitors is because the range of resistances for the
photoresistor varies for different ranges of light levels. Under lower lighting, the
photoresistor has a much higher range of resistance values than it does in a well-lit or full
sun area.
As discussed earlier, the discharge time depends on the RC time constant, R x C. If R
tends toward a relatively high range of resistances, using a smaller value of C will bring
the value of R multiplied by C back down. Likewise, if R is low, using a larger value of
C helps bring the value of RC back up.
Figure 8-8
Sample Debug
Terminal Output
in After
Somebody
Turned Out the
Lights
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