Arduino with Adafruit V1 Motor Shield and Potentiometer

Hello, first post as I am VERY new to this whole field. I am trying to control the speed of a stepper motor (two eventually) using a 10K potentiometer. I have the following components:

• Arduino R3
• Adafruit V1 Motor Shield L293D
• Two Vexta Model C5919-9012 Bi-Polar stepper motors with 200 steps and 0.14A

I am powering the motors with an external 12VDC power source. I have also tried a 5V power source through the Arduino as well. The code I found passes the checks but there is no response from the motor.

Here is the wiring setup:

#include <AFMotor.h>

AF_Stepper stepper1(100, 1);

int analogPin = A0; // Pin analog

int val = 10; // variable to store the value read
int prepos = 0;
int pos = 0; //0 to 224

void setup()
{
   stepper1.setSpeed(10); 
   Serial.begin(9600);
}

void loop()
{
   prepos = pos;
   val = analogRead(analogPin); // read the input pin

   //pos = map (analogRead(analogPin), 0, 1023, 0, 200);
   
   // read pot and map to stepper speed
   int spd = map (analogRead(analogPin), 0, 1023, 0, 200);
   stepper1.setSpeed(spd);
   
   if (pos != prepos)
   {
      int diststep = pos;
      if (diststep > 0)
      {
         stepper1.step(diststep, FORWARD, DOUBLE);
      }
   }
}

Any help is greatly appreciated.

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