Control DC Motor Direction with Potantiometer

Projects General Guidance
1

Hi there;

I am new about Arduino, I try to learn it. I want to control motor direction using pot. Motors speed is stable. When I turn right the pot, motor turning right. When I turn left the pot motor turning left.
Finally, when the motor turns left or right, is it possible that the motor stops when I stop turning the potentiometer?

2

So you want a motor to turn at a constant speed in both directions but use a pot whose centre position is motor off and right travel is say, clockwise and left travel is anti-clockwise.

Could be done but you would need a deadband somewhere near the centre that does nothing otherwise the motor will hunt from one direction to the other.

Your last request doesn't make much sense.

Why a pot if you're not controlling speed?

2 push buttons would suffice.

3

This is not garantied, but try this

int PotPin = A0;
int PotPos;
int lastPotPos;
int MotorPin1 = 3;
int MotorPin2 = 4;
void setup() {
  // put your setup code here, to run once:
  pinMode(MotorPin1, OUTPUT);
  pinMode(MotorPin2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  PotPos = analogRead(PotPin);
  PotPos = map(PotPos, 0, 1023, 0, 200);

  if (lastPotPos != PotPos) {
    if (lastPotPos < PotPos) {
      digitalWrite(MotorPin1, HIGH);
      digitalWrite(MotorPin2, LOW);
    } else if (lastPotPos > PotPos) {
      digitalWrite(MotorPin1, LOW);
      digitalWrite(MotorPin2, HIGH);
    } else {
      digitalWrite(MotorPin1, LOW);
      digitalWrite(MotorPin2, LOW);
    }
  } else if (lastPotPos = PotPos) {
    digitalWrite(MotorPin1, LOW);
    digitalWrite(MotorPin2, LOW);
lastPotPos = PotPos;
  }
}
4

Finally, when the motor turns left or right, is it possible that the motor stops when I stop turning the potentiometer?

Do you mean like the Servo in the Servo library knob example?

5

Not quite. I made another change to my code. It should work, but like I said it might not work.