Week 3 Lab

from Electronic Technologies for Art

Contents

Analog Input

• File->Sketchbook->Analog->AnalogInput

 val = analogRead(potPin);    // read the value from the sensor

• Potentiometer

• Q: What will the voltage at A_IN be? What are the upper and lower values?
• Q: Looking at the Arduino help for the analogRead() function, what will the value val be for those highest and lowest voltages?

• photoresistor from your 147A kit... 160k - ~10k (depending on your lighting conditions).
• Q: With the same 10k resistor from the schematic above, what range of voltages (and corresponding data values) would you expect to see with this?
• Q: How could we verify this?

• strain gauge

Analog Output

LED Dimming

• File->Sketchbook->Examples->Analog->Fading

   analogWrite(ledpin, value);           // sets the value (range from 0 to 255) 

PWM (pulse width modulation)

• lights, fading

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Motor Speed Control

• Basic motor control (DC motors) see week 5

Sound, Tone Generation

• sounds, tone generation