28176 Parallax Inc, 28176 Datasheet - Page 139

• 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

Challenge 4-7: Adding Speed Indicators
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Re-run Tachometer.bs2, and close the Debug Terminal.
Run StampPlot macro pc_gen_process.spm.
Complete Table 4-4 in Activity #6 using the higher cycles/count encoder wheels
if not yet complete.
Add an active-high red LED to P11, and a green one on P10.
Save Tachometer.bs2 under a new name.
Add code that will light the Green LED if the RPM is greater than 7500 RPM (or
500 RPM below your normal RPM). Light the red LED if the speed is less than
that value.
You may have to re-adjust the distance between the QRB1114 and the fan when using
the Darlington pair circuit.
Figure 4-27
Opto-Reflective
Switch Using
Darlington Pair
Wiring Diagram