I have a simple 3 ft by 3 ft goal. I want to electronically detect when a ball passes into the goal but not when it goes wide.
I had initially thought i could use a simple PIR motion detector pointing downward on the cross bar but I am concerned that 1) it might detect balls that go wide? (how do i restrict the arc) 2) it might be too slow for a fast moving ball 3) it might miss balls in top corner etc
Option two is a series of emitter reciver ir pairs on each side of the goal post. Enough to make sure that a ball can't get through. See attached sketch of the options.
I have zero experience with this. I am thinking the emitter pairs is best option but I am unsure? Maybe there is another alternative? The overriding concern is that the solution must require minimal power to run (and cost!).
edit as directed by site to explain why not duplicate -- to reiterate my comment below: yes they are similar questions. I think my question was more specific. I asked specifically for option a) or option b) or something else. Steve G kindly informed me why the PIR was not suitable -- as it uses temperature -- as opposed to use solution this because i think so. For this reason I think this question is worthy as a standalone and I will update the answer to reflect why PIR was not suitable.