PWM DC motor control

I have been experimenting with using PWM (pulse width modulation) to control the speed of a DC motor. I have been using the Arduino as a standalone device, with a pot attached. I have also been using a ULN2003.

This method will make the DC motor "think" it is being powered by a variable voltage source between 0 and 5V, depending on the state of the potentiometer.

So, the following hardware connections should be made:

• ULN2003 PIN 8 to GND
• ULN2003 PIN 9 to 5V
• ULN2003 PIN 1 to Arduino digital control pin 9
• ULN2003 PIN 16 to one terminal of the motor
• the other terminal of the motor to 5V
• one of the outer legs of the potentiometer to 5V
• the other outer leg of the potentiometer to GND
• the middle leg of the potentiometer to Arduino analog in 0

Arduino Code:

byte data;

void setup() {

}

void loop () {
data = analogRead(0) / 4;

analogWrite(9, data);
delay(5);
}