130-28176 Parallax Inc, 130-28176 Datasheet - Page 266

• Manufacturer Part Number: 130-28176
• Description: KIT PARTS PROCESS CONTROL
• Manufacturer: Parallax Inc

Specifications of 130-28176

• Accessory Type: Education Kit
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Board of Education Full Kit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

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.