28176 Parallax Inc, 28176 Datasheet - Page 83
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 #7: TYPICAL INDUSTRIAL SWITCHES
The pushbutton is just one of many switches available. Figure 3-19, Figure 3-20, and
Table 3-2 show a variety of different switches commonly used in industrial applications.
These switches may be either mechanical or electronic in their operation.
A mechanical switch, such as the pushbutton, opens or closes contacts to allow current to
flow. When being used as an input to the BASIC Stamp, a pull-up or pull-down resistor
is needed. The need for output conditioning is true of many electronic switches as well.
Electronic switches that provide “non-contact” detection are very popular in industrial
applications. No physical contact for actuation means no moving parts and no electrical
contacts to wear out. The pushbutton switch used earlier should be good for several
thousand presses. However, its return spring will eventually fatigue, or its contacts will
arc, oxidize, or wear to the point of being unreliable.
Figure 3-19
Different
Switches used
in Industry
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