122-28176 Parallax Inc, 122-28176 Datasheet - Page 134

• 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

Page 124 · Process Control
Figure 4-22 Fan RPM Plot with Varying Sample Durations
One way to increase the resolution without having to sample longer is to increase the
number of counts per revolution. Using an encoder wheel with two light/dark pairs will
double the number of counts and increase the resolution.
Compare the earlier waveform in Figure 4-21 using the 1 cycle/revolution encoder to
Figure 4-23 using the 8 cycles/revolution. As the number of encoder patterns increases,
more counts occur during the same time period.