122-28176 Parallax Inc, 122-28176 Datasheet - Page 246

• 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

PlotTemp:
Note that the code adds a band control (+/−) to StampPlot to adjust the control band.
Shortly, we will discuss how this was performed.
The smallest possible value is 0.01 since the BASIC Stamp is controlling in hundredths
of degrees. A gap of 0.01 °F may not be a realistic value depending on the resolution of
the ADC. To find the smallest temperature change, divide the resolved temperature span
(120 − 70 = 50 by default) by the 255 to obtain the resolution.
Figure 7-10 is a plot of our results. Note that the UTP and LTP are plotted along with the
setpoint and current value. Are the eggs harmed when temperature overshoots 105 °F?
Probably not. Remember that the transfer of energy is not instantaneous. The eggs,
based on their mass and heat conduction properties, have a time constant. A short rise
ENDIF
IF (TempF > UTP) THEN
ENDIF
RETURN
DEBUG "[", DEC TempF,",/,100]", ",", ' Plot current temp,
"[", DEC SetPoint, ",/,100]",",",
"[", DEC UTP, ",/,100]",",",
"[", DEC LTP, ",/,100]",CR
DEBUG "!O txtTemp=(AINVAL0)",CR
DEBUG IBIN Heater, BIN Fan,CR
RETURN
√
√
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√
√
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HIGH Heater
LOW Heater
Open StampPlot macro sic_pc_incubator_on_off.spm.
Verify the Lower and Upper Temperatures for monitoring are 70 to 120
respectively.
Verify the setpoint is 101.5.
Connect and Plot.
Verify the control band is set to (+/−) 1.
Note the action of the incubator as it rises to the setpoint.
Once temperature has stabilized after several cycles, clear the min/max
temperatures and monitor for several minutes.
Adjust the band (+/−) to achieve the smallest control band for minimizing
overshoot or undershoot while preventing actuator cycling due to noise.
' Heat On If less than LTP
' Heat off if greater than UTP
' and setpoint,
' and UTP
' and LTP
' Update current temp text
' Plot heater as digital