Self-Check
- In this activity you:
- Probed, measured, and graphed voltage with an oscilloscope.
- Examined the appearance of the duty cycle on the voltage vs time graph.
- Used the Time/Div control to view the voltage signal in more detail.
- Were you able to manipulate the duty cycle through the script?
- Could you see the relationship between the LEDs supply voltage and time?
Questions
- What are oscilloscopes used for?
- What does an oscilloscope do?
- What does it mean to have a falling trigger event?
- Describe a rising edge.
- Where on the graph will you find the high signal represented?
Exercises
- How do you change the duty cycle from 50% to 75%?
- What is the purpose of sleep(1) in the oscilloscope script?
- In order to more closely inspect each on/off signal on the graph, you can make adjustments to which setting on the CYBERscope?
- What function sends data to the CYBERscope so that it can be displayed on the graph?
Project
Change the resistor in the green LED circuit to a 1 kΩ resistor (brown-black-red-gold). What changes do you observe in the graph? (Make sure to switch the resistor back.)