Blinking Measures

How can I measure a person's blinks using and Arduino?

With or without delay?

(sorry - Forum joke.)

Are you asking what sensors might be available?

spend some time with google

google is your friend when it comes to basic research

patduino:
With or without delay?

+1 ROTFLMAO

Better damn well be without delay! Otherwise we’d be sitting around a lot more.

… hmmm. My firmware might be using delay.

Chessy, try putting light detectors on glasses, that look at a person’s eyes from the side. See if you can detect a change at the blink. Google is good - and you will get lots of ideas from it, but nothing beats physical experimentation!