I have written very similar code before for having my planes rotate side-side when the player moves. This should get you going.
public class PlayerMove : MonoBehaviour {
public float maxMove=0.1f; // speed of the movement of the object
public float maxTurn=30; // max angle it turns up/down
public float turnRate=10; // how quickly it turns up/down
Rigidbody2D rb2d;
// Use this for initialization
void Start () {
rb2d = GetComponent ();
}
// Update is called once per frame
void Update () {
float delta = Input.GetAxis ("Vertical");
rb2d.MovePosition (rb2d.position + Vector2.up * delta * maxMove * Time.deltaTime);
// simply set the angle
//rb2d.rotation = turnAngle * delta;
// use Lerp to set the angle
rb2d.rotation = Mathf.Lerp (rb2d.rotation, maxTurn * delta, turnRate*Time.deltaTime);
// you could use SmoothStep/SmoothDamp as well
}
}
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