Digital presence sensor

[eliseguimaraes]

I am doing a project where one of the entries is 1 when there's someone at a place and 0 when there's no one (more specifically, in front of some sensor). I need some device that does that, like an infrared sensor or something, but I need help. Could you suggest something (any sensor that outputs one when presence is detected right in front of it, in a short distance). Thank very much.

 

[Jestin_cubetech]

PIR Sensors
http://ctrlsave.com/portable/images/pir.jpg

 

[udhay_cit]

If you want to sense the person in front of the sensor, you have to use IR reflective or ultrasonic sensors. If you want to sense the person in a wide area you have to use PIR sensor.

 

[HTA]

A Triangulation sensor could do the job as well: https://www.edn.com/design/analog/4...ation?cid=Newsletter+-+EDN+Products+and+Tools .

Enjoy your design work!

 

[klystron]

Please specify what is a person present for example it must be a person moving at speeds more than .001m/s for 90% of the time ; 20 % of the body area at 37 deg C must be visible to the sensor 90 % of the tme