28176 Parallax Inc, 28176 Datasheet - Page 101
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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Chapter 4: Sequential Processes and Optical Switches · Page 91
Table 4-1: Surface/Distance Combinations for 1.5 Volts
Surface Material
Distance (mm)
White Paper Test Reflector
ACTIVITY #2: BATCH OR SEQUENTIAL PROCESS CONTROL
A batch, or sequential process, uses input signals and timing to perform a straightforward
set of operations. A good example of a sequential process is a traffic light. A sensor
embedded in the road detects a vehicle, and a sequence begins to switch the lights,
controlling the flow of traffic.
In this experiment, a mix process will be simulated using the opto-reflector and
pushbuttons for inputs. The opto-reflective switch will be used to sense level. A more
realistic approach for sensing the level would be an inductive proximity sensor that may
be adjusted to 'ignore' the container's mass, and detect level inside an opaque container.
LEDs will be used to indicate the status of the process.
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