Description

I used one potentiometer to control 2 LEDs and one DC motor.
When you run the program and revolve the potentiometer above the certain threshold (512), the Bear's eyes glow. When you revolve the potentiometer more, the pinwheel whirls.

Hardware Components Used

2 LED
3 Resistors (1K*1, 220k*2)
1 Potentiometers
1 DC motor
1 Transistor
1 Diode
Arduino Board
Breadboard
Wires
1 Pinwheel

Arduino 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
* Modified again by EunKyoung Choe
* TUI Lab6 Homework
* 10/10/07
*/

int potPin = 0; // select the input pin for the potentiometer
int motorPin = 9; // select the pin for the Motor
int LEDpin1 = 11;
int LEDpin2 = 12;
int threshold1 = 512;
int threshold2 = 900;
int val = 0; // variable to store the value coming from the sensor

void setup() {
Serial.begin(9600);
pinMode(LEDpin1, OUTPUT);
pinMode(LEDpin2, OUTPUT);
}
void loop() {
val = analogRead(potPin); // read the value from the sensor, between 0 - 1024
Serial.println(val);

//if value greater than threshold1 then turn on LED
if (val < threshold1){
digitalWrite(LEDpin1, LOW);
digitalWrite(LEDpin2, LOW);
}

else if (threshold1 < val < threshold2){
digitalWrite(LEDpin1, HIGH);
digitalWrite(LEDpin2, HIGH);
}

//if value greater than threshold2 then turn on motor
else{
digitalWrite(LEDpin1, HIGH);
digitalWrite(LEDpin2, HIGH);
analogWrite(motorPin, val/4); // analogWrite can be between 0-255
}

delay(10);
}

Photo