130-28176 Parallax Inc, 130-28176 Datasheet - Page 194
130-28176
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
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Figure 6-3 is a plot of the heating and cooling. Have you seen a curve of this shape
previously? Recall the discharge plot of the RC network in Chapter 5. This is, or is close
to, what is called a First Order Response Curve and is seen in many simple systems that
have a transfer of energy.
mathematical value e, the natural log, is based on this response curve.
The shape of the curve stems from the fact that when there exists a large difference in
energy, there is a fast transfer of energy. As the two systems' energy states become
closer, the transfer rate decreases exponentially. The voltage across a capacitor and the
Figure 6-3 Plot of Heating and Cooling
√
√
√
√
√
√
√
√
Construct the circuit in Figure 6-2.
Run the BASIC Stamp program DataMonitoring.bs2 from Chapter 3, page 46.
Open StampPlot macro sic_pc_data_monitoring.spm (also from Chapter 3).
Adjust the analog (Y-axis) scale to 2.50.
Increase the time (X-axis) scale to 480 seconds.
Connect and plot.
Use a lighter or other heat source to apply heat to the LM34, not to exceed 2.0 V
(200 °F).
Monitor temperatures noting the minimum change in voltage.
In this case the energy is that of temperature.
The
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