28119 Parallax Inc, 28119 Datasheet - Page 71

• Manufacturer Part Number: 28119
• Description: KIT UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc

Specifications of 28119

• Lead Free Status: Contains lead
• Accessory Type: Oscilloscope
• Interface Type: USB
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Summary
This chapter demonstrated resistor/capacitor charge signals. It also showed how to use
the OPTAscope to verify a calculated constant for an R/C network. Finally we
demonstrated how to calculate a value of an unknown resistance, given the value of the
capacitor and measuring the time constant.
Exercises
Further Investigation
“Applied Sensors”, Student Guide Version 1.3, Parallax, Inc. 2003.
1. Build the circuit used in Activity 1, but replace the 10 µF capacitor with a 1 µF
2. Replace the photoresistor with a potentiometer and calculate the resistance.
3. Set the thumbwheel on the potentiometer to a new position and calculate its
capacitor. Calculate the RC constant and verify your answer with the
OPTAscope.
resistance.
Authored by Tracy Allen, PhD., this text provides very detailed discussions of
the BASIC Stamp’s RCTIME command with temperature probes and
photodiodes. It is available online from the Stamps in Class Curriculum menu
on the Education page at www.parallax.com.