Is this the best way to simulate button taps?

I have 3D GameObjects that I use with Colliders as triggers and for the most part work OK, but am now trying to create a toggle on / off button on a 3D model. For this I cannot use the Unity UI.

I have a BoxCollider on the GameObject acting as a button and attached this code:

Code (csharp):

1.  
2. void Update () {
3.  
4.     if (Input.touchCount == 1) {
5.  
6.       Touch touch = Input.GetTouch (0);
7.  
8.       Ray ray = Camera.main.ScreenPointToRay (touch.position);
9.  
10.       RaycastHit hit;
11.  
12.       if (Physics.Raycast (ray, out hit) && (hit.collider.gameObject.name == "3DButton")) {
13.  
14.           butterHandler ();
15.       }
16.     }
17.  }
18.  

But what is happening is the code gets called so fast it triggers a button tap multiple times on a single tap?

I have tried using boolean flags but still no luck so started to wonder am I actually doing this the right way?

 

check the tap "phase"

http://docs.unity3d.com/ScriptReference/Touch-phase.html

 

Thanks ;-)