/*

Voltaat learn (http://learn.voltaat.com)

Link for full tutorial:

Tutorial: Control motor speed using Arduino and a potentiometer!

The purpose of this sketch is to control a motor speed with a potentiometer

and an Arduino, using the PWM technique.

Connections from the Arduino to the breadboard:

• Arduino 5v pin → breadboard 5v line

• Arduino GND pin → breadboard GND line

Connections from the Rotary potentiometer to the Arduino:

• potentiometer GND pin → Arduino GND pin

• potentiometer out pin → Arduino A0 pin

• potentiometer VCC pin → Arduino 5V pin

Connections from the NPN transistor:

• NPN emitter pin → Arduino GND pin

• NPN base pin (middle pin) → Arduino pin 3

• NPN collector pin → Motor first wire

Connections from the motor:

• Motor first wire → NPN collector pin

• Motor second wire → Arduino VCC pin (5V)

*/

int pwmPin = 3; // assigns pin 3 to variable pwm

int pot = A0; // assigns analog input A0 to variable pot

int c1 = 0;   // declares variable c1

int c2 = 0;   // declares variable c2

void setup()  // setup loop

{

 pinMode(pwmPin, OUTPUT);

 pinMode(pot, INPUT);  

}

void loop()

{

 c2= analogRead(pot);

 c1= 1024-c2;         // subtracts c2 from 1000 ans saves the result in c1

 digitalWrite(pwmPin, HIGH);

 delayMicroseconds(c1);  

 digitalWrite(pwmPin, LOW);  

 delayMicroseconds(c2);  

}

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