28129 Parallax Inc, 28129 Datasheet - Page 137
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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The photoresistor senses light level. Under a bright light, the resistance can drop to as
low as a few ohms. In darkness, the resistance can climb as high as 50 k s. Figure 7-4
shows the circuit symbol for a photoresistor and a drawing of the component
Build It
Build the circuit shown in Figure 7-5. Recall from Chapter #4 that the inputs of the
ADC0831 have very high resistance, and they resemble an open circuit. Because of this,
it's okay to connect the output of the D/A converter to the ADC0831's Vin(+) input
without the buffer.
We are going to use the
conversion. Then we'll measure the voltage using the ADC0831 as a DVM.
P8
10 k
Ω
Vss
1 µF
Vss
PWM
2
4
3
command to send pulses to the RC circuit for D/A
Vdd
Vin(+)
GND
Vin(-)
ADC0831
8
Vdd
Vref
CLK
5
/CS
D0
1
7
6
Figure 7-4
Photoresistor Circuit
Symbol and Component
P0
P1
P2
Figure 7-5
RC Circuit for PWM D/A
Conversion
Connected to the Vin(+)
terminal of the ADC0831.
The ADC0831 is
connected to the output of
the D/A converter to
measure the output
voltages.
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