Potentiometer to control direction of Motor

Using Arduino Project Guidance
#1

Hi guys, can anyone tell me whether there’s anything wrong with my program below ? I’m trying to make the motor turn left/right when the potentiometer reading is <512, and right/left vice versa when reading is >512. Help is greatly appreciated.

const int analogInPin = A0;
int d = 9;
int e = 10;
int f = 12;

int sensorValue;

void setup()
{
Serial.begin(9600);
pinMode(d, OUTPUT);
pinMode(e, OUTPUT);
pinMode(f, OUTPUT);
}
void loop()
{
sensorValue = analogRead(analogInPin);
if(sensorValue < 512)
{
digitalWrite(d, LOW);
digitalWrite(e, HIGH);
digitalWrite(f, HIGH);
}
else
{
digitalWrite(d, HIGH);
digitalWrite(e, LOW);
digitalWrite(f, HIGH);
}
Serial.print(sensorValue);
Serial.print("\n");
}

#2

It only spins when the sensorValue is more than 512. which is confusing me

#3

please use the # button when posting code, looks so much better :wink:

you allways write HIGH to F, think the first one should be low???

a variation

const int analogInPin = A0;
int d = 9;
int e = 10;
int f = 12;

int sensorValue;
int state = LOW;  

void setup()
{
  Serial.begin(115200);
  Serial.println("Start"):
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
}
void loop()
{
  // do an average reading to prevent flux

  for (int i = 0; i< 4; i++) sensorValue += analogRead(0); 
  sensorValue /= 4;

  // prevent noise area
  if(sensorValue < 500 && state == HIGH) state = LOW;
  if(sensorValue > 525 && state == LOW) state = HIGH;

  // execute 
  if (state == LOW)
  {
      digitalWrite(d, LOW);
      digitalWrite(e, HIGH);
      digitalWrite(f, HIGH);   
  }
   else
   {
       digitalWrite(d, HIGH);
       digitalWrite(e, LOW);
       digitalWrite(f, HIGH);
     }
    Serial.print(sensorValue);   
    Serial.print("\n"); 
}
#4

Hi there ! I tried the program you pasted, the Serial Monitor shows some weird corrupted signals and the motor spins at a certain value and stop like what I exactly did previously.

#5

So Sorry ! Didnt mention that the f is the Enable A of the H bridge. while d and e are the inputs for h bridge l298 to the arduino

#6