28176 Parallax Inc, 28176 Datasheet - Page 131

• 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

Chapter 4: Sequential Processes and Optical Switches · Page 121
Figure 4-20 Fan RPM with When Powered from Vin
With this configuration and sample time what is the resolution of the tachometer? For
each count change, there is a change of 60 RPM. Depending on the application, this may
or may not be an acceptable resolution.
Figure 4-21 is an oscilloscope capture of the voltage at the phototransistor's collector.
The waveform shows the voltage at P8 at the input to the BASIC Stamp (as the fan
rotates).