How do I make a trigger event run until object is at angle?

hello,

I have been working for hours now trying to figure out how to make my camera smoothly rotate around the layout 180 degrees whenever i tap the letter "q". and when it is at 180 degrees I want it to smoothly rotate back to 0 degrees.

I just can NOT seem to figure it out so I am calling to the forums to help...

I have no .capx to post because I simply have gotten nowhere useful in finding a solution to my problem

Thank you in advance for your help ,

Ian

Using Sine.

https://www.dropbox.com/s/nbjpnt7ze5yq6 ... .capx?dl=0

or

https://www.dropbox.com/s/a6ff9ksrlyedi ... .capx?dl=0

But there are a 1000 other ways.