28176 Parallax Inc, 28176 Datasheet - Page 162
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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ACTIVITY #3: PWM FILTERING
The inertia of the fan performed mechanical filtering, or damping, to run at various
constant speeds with a quick cycling of high and low voltages. Your eye performed
filtering of the LED blinking on and off rapidly to see a bright or dim LED. Electrical
filtering of a changing voltage can be achieved by the use of a resistor-capacitor (RC)
network.
A capacitor is used to hold a charge of electrons. An RC network, properly sized, can be
used to filter the cycling PWM to a constant voltage.
Additional Parts Required
(1) 10 kΩ Resistors
(1) 100 kΩ Resistor
(1) 1 MΩ Resistor
(1) 0.68 µF Capacitor
√
√
Remove the fan circuit connected to P2 (including its MOSFET transistor, LED,
both 220 Ω resistors, and the fan itself).
Replace it with the RC circuit as shown in Figure 5-11. DO NOT connect R
initially.
L
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