For this lab, I chose to make a coffee cup that stirs itself. I used the DC motor to power the spinning/mixing of the spoon within the coffee cup and I programmed the potentiometer to control how quickly the spoon stirs the coffee.

Components:

• Arduino board
• Breadboard
• Jumper wires
• 1 DC motor
• 1 potentiometer
• 1 1k resistor
• 1 diode
• 1 battery pack

Code:

/*
 * one pot fades one motor
 * modified version of AnalogInput
 * by DojoDave <http://www.0j0.org>
 * http://www.arduino.cc/en/Tutorial/AnalogInput 
 * Modified again by dave
 */

int potPin = 0; // select the input pin for the potentiometer
int motorPin = 9; // select the pin for the Motor
int val = 0; // variable to store the value coming from the sensor
void setup() {
 Serial.begin(9600);
}
void loop() {
 val = analogRead(potPin); // read the value from the sensor, between 0 - 1024
 Serial.println(val);
 analogWrite(motorPin, val/4); // analogWrite can be between 0-255
}