Doing a proof of concept and need advise on which sensor to use; I would like to create myself an SMS-service that sends me a message as soon as something visually changes on a screen I have setup. Sending an SMS service is not a problem, but I want to know how to detect something when changes happen on a screen.
I want to setup a sensor, 15 - 30 cms from a 15" screen that continually visually monitors changes that happen on the screen. I want to check on intervals of 25ms. What kind of sensor would you use? A camera? Or any other sensor you have in mind? And, do you guys/girl perhaps
thanks in advance,