Just a reminder
Microcontrollers cannot produce varrying voltages. They produce a high (5V) and a low (0V).
But you can "fake" analog output by using pulsewidth modulation. Just like animation creates the illusion of movement, pulsewidth modulation, manipulates the
intervals bewtween on (the pulsewidth) and off in such a way that it fools the eye and appears to be between on and off.
Wire up a flex sensor (a flex sensor uses the same circuit as a photocell). Make the lights fade and blink.
Wire up a pressure sensor (an fsr uses the same circuit as a photocell).
Make the lights fade and blink.
The more pressure applied, the lower the resistance.
Assignment
Create a piece to present to the class that uses an fsr. Embed it in some material. Think about action and reaction.
What do people apply pressure to? What can happen when they do?
Do you want to help, surprise or inspire someone?
- A toothpaste or paint tube
- A sponge
- A Stress ball
Experiment!!