// Fades from minimum to maximum in one second
    var minAngle = 0.0;
    var maxAngle = 90.0;
    function Update () {
        var angle : float = Mathf.LerpAngle(minAngle, maxAngle, Time.time);
        transform.eulerAngles = Vector3(0, angle, 0);
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public float minAngle = 0.0F;
    public float maxAngle = 90.0F;
    void Update() {
        float angle = Mathf.LerpAngle(minAngle, maxAngle, Time.time);
        transform.eulerAngles = new Vector3(0, angle, 0);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public minAngle as single = 0.0F

    public maxAngle as single = 90.0F

    def Update():
        angle as single = Mathf.LerpAngle(minAngle, maxAngle, Time.time)
        transform.eulerAngles = Vector3(0, angle, 0)