Dynamic Waveforms

Overview

In this lesson, you will create waves that change over time. Wave forms are defined by their HIGH and LOW times. When the two tiem sare fixed values the wave produces a fixed frequency. If you vary eith the HIGH time or LOW time you can change the frequency or sound of your wave form. Exercise: ~~~~~~~~~

  1. Write a program that creates a waveform, but instead of using fixed values for the delay values (HIGH and LOW) use a two variables. See example below. Initialize these variables at the top of your code. Set both to 400. Make sure to use delayMicroseconds() for your two delays. Display your waveform on your scope.

delayMicroseconds(400); //Fixed 400us delay

delayMicroseconds(x); //A variable delay based on the value of x

  1. Add a piezo speaker with volume control to your breadboard, and drive the speaker with this waveform.

    TEACHER CHECK _____

  2. Modify your code to include a for loop to control one of the delay variables. Set up your code so the for loop controls one of the delay values over time. Display this on your scope as well with your piezo speaker.

    TEACHER CHECK _____

  3. Play around with changing your waveform to make different sounds and displaying them on your scope.