130-28176 Parallax Inc, 130-28176 Datasheet - Page 259

• 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

Breaking down the control in English:
Figure 8-1 Evaluation and Control of PID
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The controller will deliver a level of drive based on the calculations to try and
maintain the system at the desired setpoint.
Bias Drive is the amount of signal needed to drive the system at the setpoint
under normal conditions. In Chapter 6, the PWM drive to the heater was
manually adjusted until the incubator's temperature was in the operating band.
Under constant conditions, approximately 30% of output drive was necessary to
keep the system in the band. But, as we saw, when air was blown over the
incubator, conditions changed, the drive remained constant and the system
dropped below our defined operating limit.