130-28176 Parallax Inc, 130-28176 Datasheet - Page 237

• 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

CalcTemp:
Drive_Heater:
PlotTemp:
When you start your system, the heater will be on as indicated by the LED. The
heater/resistor becomes quite hot when full power is applied. This heat transfers through
the environment and warms the temperature sensor. When the sensor has heated to 101.5,
the BASIC Stamp will turn off the heater. For a period after the heater is turned off, the
temperature continues to rise. This is called overshoot. At this point, it is important to
understand the dynamics of your system. The heat held within the mass of the resistor
will continue to dissipate into the air, the air becomes warmer, and the LM34 reports that
overshoot has occurred. Similar to the mechanical inertia of a moving object, this
phenomenon is called thermal inertia.
Overshoot becomes large when the heat energy contained in the mass of the resistor is
large, relative to the heat already in the test tube. The test tube is small, but the mass of
HIGH ADC_CS
RETURN
TempF = (V_Span * 100)/255 * ADC_ByteValue + (V_Offset * 100)
RETURN
IF TempF > SetPoint THEN
ELSE
ENDIF
RETURN
DEBUG "[", DEC TempF,",/,100]", ",",
DEBUG "!O txtTemp=(AINVAL0)",CR
DEBUG IBIN Heater, BIN Fan,CR
RETURN
√
√
√
√
√
√
LOW Heater
HIGH 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
Note the action of the incubator as it rises to the setpoint.
Once temperature has stabilized, clear the min/max temperatures and monitor for
several minutes.
"[", DEC SetPoint, ",/,100]",CR
' Disable ADC
' Transfer function for temperature in hundreths
' Determine heater state
' Above setpoint - Heat off
' Below setpoint - Heat on
' Plot temperature
' and setpoint
' Update temperature reading
' Plot fan as digital