Player change direction

Hello.
I want my Player to change direction when he hits a wall by 180 degrees, but im not sure how to do it. I also want him to change the facing direction 180 degrees at the same time. The movement is just fine, its just the changing of direction i need some help with

Code (CSharp):

1. public class MoveTest : MonoBehaviour {
2.  
3.     public float Speed = 0.3f;
4.  
5.     private void FixedUpdate()
6.     {
7.         transform.Translate(Speed * Time.deltaTime, 0, 0);
8.     }
9.  
10.     void OnTriggerEnter(Collider col)
11.     {
12.         if (col.gameObject.CompareTag("xFlip"))
13.         {
14.             //Make the direction of travel rotate 180 Degrees.
15.             //Make the facing direction rotate 180 Deg.
16.             Debug.Log("Hit");
17.         }
18.     }
19.  
20. }

 

Flip the speed to a negative value? i.e. Speed = -Speed.

 

I have tried doing that exact solution multiple times before, and I never got that to work.
Now I got it to work, looks like I had some trouble with the trigger.

 

Made some minor changes and now it works just as I want it to

Code (CSharp):

1. using UnityEngine;
2.  
3. public class MoveTest : MonoBehaviour {
4.  
5.     public float Speed = 0.3f;
6.  
7.     private void FixedUpdate()
8.     {
9.         //moves the Player at a constant speed.
10.         transform.Translate(-Speed * Time.deltaTime, 0, 0);
11.     }
12.  
13.     void OnTriggerEnter(Collider other)
14.     {
15.         if (other.gameObject.tag == "xFlip")
16.         {
17.             // Makes the facing and movement change by 180.
18.             transform.Rotate(0, 180, 0);
19.         }
20.     }
21.  
22. }