122-28176 Parallax Inc, 122-28176 Datasheet - Page 114

• Manufacturer Part Number: 122-28176
• Description: GUIDE STUDENT PROCESS CONTROL
• Manufacturer: Parallax Inc

Specifications of 122-28176

• Accessory Type: Manual
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Propeller Education (PE) Kit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

ACTIVITY #4: BOX CONVEYOR BELT – COUNTING AND EDGE
DETECTION
Parts Required
Same circuit as Activity #2
This conveyor belt simulation activity uses the same BASIC Stamp circuit and StampPlot
macro as the previous activities, but addresses different issues by using a conveyor
system to count and divert boxes to one of two loading bays. The following is the feature
set of this control system, depicted in Figure 4-14:
EDGE DETECTION
Before beginning any programming, let us first discuss issues involved in counting with
digital inputs. One of the functions of the system is to count the boxes that pass. The
digital input is LOW when a box is detected with the opto-reflective switch. Should the
Figure 4-14 Conveyor Belt System
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Detection and counting of boxes to be loaded onto trucks. The yellow LED
indicates detection.
Operation of a gate to divert the boxes to one of two truck-loading bays signified
by a green LED. One full truckload is 6 boxes.
Operation of the conveyor belt with the use of two pushbutton switches – Start
and Stop. The energized conveyor is signified with the red LED.