130-28176 Parallax Inc, 130-28176 Datasheet - Page 278

• 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

Set 1
Set 2
Set 3
Set 4
Set 5
Figure 8-10 is a plot of our results for discussion.
Set 1
As the signal gradually rises, the slope of the error (line connecting dots) is positive, and
the output is positive. As the signal gradually falls, the slope of the error is negative and
so is the output. It does not matter if the actual value is above or below the setpoint, it is
simply a matter of the direction of change.
Set2
As the signal changes faster, the output increases in magnitude. The error changed more
over the same sample time though the level of the signal was relatively the same.
Set 3
With the signal relatively constant, though well above the setpoint, the output is roughly
zero (as well as we could hold our hand stable). Even though there existed an error, the
error was not changing, therefore no output.
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Reset the plot, reset the BASIC Stamp, and slowly darken and lighten the sensor
over 30 seconds or so.
Change the light level fairly rapidly for about 10 seconds.
Hold the light level constant above the setpoint.
Change the evaluation sample time to 0.5 seconds and reset the BASIC Stamp
(not the plot).
Slowly darken and lighten the sensor over 20 seconds.
Quickly lighten and darken the sensor over about 10 seconds.
Close the connection (F6).