28176 Parallax Inc, 28176 Datasheet - Page 243

• Manufacturer Part Number: 28176
• Description: KIT PARTS PROCESS CONTROL W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28176

• Accessory Type: Process Control
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Chapter 7: Closed Loop Process Control · Page 233
still result in some amount of overshoot and undershoot. We are accepting a wider
variance in temperature. When processes allow this variance, differential-gap control is
usually preferred over simple on-off control.
Parts Required
Same as previous Activity
Modifying the program and StampPlot only requires a little code to adapt the BASIC
Stamp program and the StampPlot macro. Figure 7-9 is a flowchart representing the
control action. The allowable band must be read from StampPlot, values for Upper Trip
Point (UTP) and Lower Trip Point (LTP) calculated, and the heater controlled based on
these setpoints.
Figure 7-9 Representative Flow Chart of Differential-Gap Control