1. Special Topic: Sound

2. Overview What is sound? How is it made? How can I make sound with the Wunderboard?

3. What is Sound? Sound is vibration of molecules Sound has – Amplitude (Loudness) – Frequency (Pitch)

4. ‘Types’ of sound Pure Sine Waves Square Waves

5. More ‘Types’ of Sounds Voice

6. How is sound made? Quickly moving objects – Speakers http://www.youtube.com/watch?v=F4frsl7gW0A – Flyback Transformers http://www.youtube.com/watch?v=w8d0GorQmrY – Fans

7. Driving Headphones Square Waves – Main frequency is at center – Sounds pretty ‘8 bit’ PWM – Much smoother output – Sounds pretty good.

8. Simple Sound Example Uses the headphone jack Uses Timer1 Simple square wave sound

9. Things to remember Hardware can take care of some simple tasks Sound is easy to make, hard to make sound nice