28176 Parallax Inc, 28176 Datasheet - Page 90
28176
Manufacturer Part Number
28176
Description
KIT PARTS PROCESS CONTROL W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28176.pdf
(330 pages)
Specifications of 28176
Accessory Type
Process Control
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Challenge 3-2 Solution
Placing the photoresistor on the Vdd side of the potentiometer modifies the circuit for a
darkroom sensor. When more light falls on it, the resistance decreases dropping more
voltage across the bottom half causing voltage to increase. The potentiometer must again
be adjusted for the desired light/dark threshold in the darkroom.
Challenge 3-3 Solution
1. The circuit in the figure is termed Active-Low because when the button is
2. A pull-up resistor used to keep the input high (up = high) when the switch is not
3. Your circuit should look like Figure 3-26. Pressing the button after reconfiguring
pressed (active) a connection is made to Vdd.
active.
should have caused the digital plot to go low.
Figure 3-25
Photographic Darkroom Alarm
Circuit Solution
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