122-28176 Parallax Inc, 122-28176 Datasheet - Page 266
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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Our main focus will be on watching how changes in the sensor cause changes in the
output values, even though the output values are not in themselves meaningful in the
physical world. Furthermore, the activity is set up so that as the photoresistor reading
increases, the output drive will also increase. This is the opposite of our incubator model
– as the temperature readings increase, the heater output must decrease to keep the
temperature at the setpoint.
The materials needed for this activity are listed below.
ACTIVITY #1: BIAS DRIVE
Parts required:
(1) 10 kΩ Photoresistor
(1) 0.1 µF Capacitor
(1) 220 Ω Resistor
√
Add the light sensor circuit in Figure 8-7 to your board, leaving all the other
components in place.
placement. We will be using the full heater circuit again shortly.
The wiring diagram shows the recommended parts
Figure 8-7
Light Sensor
Schematic (left) and
Wiring Diagram
(below)
Leave the other parts
on the board.
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