Arduino Sketches & Heart Rate Monitors

Hi, I am new to these forums, I have began implementing a project which takes in Heart Rates and outputs video clips. If the heart rate reaches 78 BPM I will output a video clip. If it reaches 80 BPM then I will output another.

I am having trouble with my Arduino Sketches, having no previous programming experience whatsoever. I need for this week some code/sketches that will read the heart rate and output something, anything, say trigger an LED to flash on and off for example. Not even that, literally anything at all. It is just sketches that I need, I have the whole Arduino board and the Electronics side of it down, I just need some very basic sketches, anything. Any help would be greatly appreciated.

Thank you in advance.