28176 Parallax Inc, 28176 Datasheet - Page 250
28176
Manufacturer Part Number
28176
Description
KIT PARTS PROCESS CONTROL W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28176.pdf
(330 pages)
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
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If all disturbances to the process remained constant, the temperature would stay at the
setpoint when the right percentage of drive was applied. We also saw that as conditions
changed, so did the measurement. Chapter 8 will investigate controls that take an
appropriate amount of action based on an evaluation of the measurement. Proportional,
Integral, and Derivative control theory can be employed to maximize the effectiveness of
the control system.
SOLUTIONS TO CHAPTER 7 CHALLENGES
Challenge 7-1 Solution
Part A:
√
√
√
√
√
In the Initialization section of your program, comment out
then set the temperature setpoint in hundredths.
'GOSUB ReadSP_Span
SetPoint = 10150
Also in the Initialization section, set the values for
V_Offset
V_Span
In the main
'
Add a subroutine to control the fan.
Drive_Fan:
Add a subroutine call in the
GOSUB Drive_Fan
IF TempF > (SetPoint + 300) THEN
ELSE
ENDIF
RETURN
LOW FAN
GOSUB ReadSP_Controls
HIGH Fan
=
=
DO...LOOP
50
70
, comment out
DO...LOOP
' Read StampPlot for ADC
GOSUB ReadSP_Controls
' Check fan state for setpoint +3F
' Above – Fan on
' Below - Heat off
:
V_Offset and V_Span
GOSUB READSP_Span
:
,
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