How can I make smooth movement ?

Hi everyone,

I would like to ask you how can I make smooth object movements in Unity ?

In my scene I have a sun that changes its position based on values detected in real-time from Arduino, actually I'm using this function but it doesn't work, because it's change like a flash and not smoothly.

  private void ReadValue(int[][] packageOfData, int chnIndex)
     {
         for (int i = 0; i < packageOfData.Length; i++)
         {
                  if (packageOfData[i][chnIndex] < 1000 && packageOfData[i][chnIndex] > 800) 
            {
                   if (DirectionalLight != null) 
                 {
                     DirectionalLight.transform.rotation = Quaternion.Slerp(point0.rotation, pointA.rotation, timeCount);
                     timeCount = timeCount + Time.deltaTime;
                 }
             }
        }
 }