I have a customer that would like to have a display that detects when a human walks up to a screen (distance like from a standard terminal) that sensor then needs to trigger a display of some data.

existing conditions:

  • wifi is present
  • high metal environment (construction hall)
  • medium to cheap price range

What kind of sensors should I look at?

  • 2
    There are floor mats that can detect when somebody stands on them. These mats use velostat which changes resistance under pressure.
    – Romen
    Mar 10 '20 at 21:37
  • 2
    You might also try passive infrared sensors (PIR), which are less reliable than a mat, but require no contact and are not raised above floor level, e.g., amazon.com/Onyehn-Pyroelectric-Infrared-Detector-Modules/dp/… Mar 11 '20 at 2:54
  • 1
    How accurate can it be? Do you allow false positives? What's your budget? Mar 11 '20 at 6:53
  • 2
    false positives are allowed but should not have alot of it. Budget is under discussion
    – Jester
    Mar 12 '20 at 10:23

I would start with a pressure sensitive floor mat which gives a switch closure when someone steps on the mat, or an infrared sensor which senses a person by reflection from an infrared LED. The latter does work on folks wearing black, BTW. Either would be monitored by an Arduino controller which, when presence is selected, provides power to the monitor through a relay.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.