I thought of a cool idea today. I am sure someone else has already done this. I would like to make a simple circuit so when the knock sensor detects a knock a LED will flash. The reason I would like to do this is because I am getting in to prom programming and it would be a nice and easy way to check and see if I am advancing the timing to much and things like that. Does anyone have a circuit diagram of a circuit that will do this?

 

A little searching turned up this link. This should be something like what you are looking for.

http://www.gnttype.org/techarea/proj...jectspage.html