This Arduino code controls a motor's speed based on the value read from a potentiometer. It sets pin 9 as an output to control the motor and pin 5 as an input to read the potentiometer. In the loop, it reads the potentiometer value, divides it by 4 to scale it to the motor's PWM range, writes this value to pin 9 to set the motor speed, and prints the value for testing.

1. int motor = 9;
int potenciometer = 5;
void setup(){
pinMode(9,OUTPUT);
pinMode(5,INPUT);
Serial.begin(9600);
}
void loop(){
int value = analogRead(potenciometer);//read input value: range between (0,1023)
int motor_speed = value/4;//PWM can only ouput 255 different values
analogWrite(motor,motor_speed);
Serial.println(motor_speed);//for testing purposes
}