122-28176 Parallax Inc, 122-28176 Datasheet - Page 288
122-28176
Manufacturer Part Number
122-28176
Description
GUIDE STUDENT PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 122-28176
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Propeller Education (PE) Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Before connecting, we will discuss some features of this interface, shown in Figure 8-12.
When plotting begins, the Message window should open, listing the current incubator
settings and conditions. Data will also be logged to message and data files when logging
is enabled. Let’s try it now.
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√
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Actual Temp: Displays the current temperature of the system.
%Error: Displays the %Error between the setpoint and actual temperatures.
200% is the maximum the StampPlot macro will calculate.
Kp, Ki, Kd: Sets the gain constants for control.
E∆t, ΣE∆t and ∆E/∆t: Displays values used for integral and derivative controls.
%Dp, %Di, %Dd: Displays the %Drive from each of the control actions.
%Bias: Sets the bias drive of the system.
%Dt: Percent of total drive, 0 − 100.
Cool: Energizes the fan, de-energizes the heater.
Mark: Marks the current control settings on the plot.
The lower graphs will plot the %Drives for P, I, D and total drive.
Open StampPlot macro sic_pc_pid_sp_calc.spm.
Upper and Lower Temp.: Sets the upper and lower temperature for reading by
the ADC. If this setting changed, you must reset your BASIC Stamp.
Full, Mid, Band: Sets the span of the plot to the temperature limits, mid range for
the band selected, or the control band only.
Setpoint: Sets the temperature setpoint of the system.
+/− : Sets the control band, such as a setpoint of 100 °F +/− 1 = 99 to 101.
* Drive Time: Sets the seconds to apply heating drive continuously before
updating.
∆t: Actual time between samples.
Connect on StampPlot and plot.
Verify that the Drive Control Setting match the following:
Upper Temp:
Lower Temp:
Setpoint:
Band (+/−):
Time:
Kp, Ki, Kd:
%Bias:
120
70
101.5
1
1
0
50
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