I would like to track human presence (or could also be sound). I will place these sensors inside my room and should be able to track these events outside of my room.

The door of my room is in-front of another door. I want to track if a person enters or exits that door (through sound or whatever). The catch is I want to do this from inside. The distance between the doors is just 1 meter. And the sound of the both doors can be heard from both sides when they are opened.


closed as too broad by Voltage Spike, Transistor, uint128_t, Dave Tweed Aug 16 '16 at 13:25

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\begingroup\$ "Also could you advice what specific sensor ...". No. See Don't ask. \$\endgroup\$ – Transistor Aug 14 '16 at 12:35
  • \$\begingroup\$ Now if you were to ask 'what type(s) of sensor might help me achieve this', you may not be in danger of having the question closed. \$\endgroup\$ – Peter Smith Aug 14 '16 at 16:52


It can penetrate a lot of materials, but not all. Depends on what the room is made of. Search for microwave detector.

There will be a detection field, some are adjustable.

You will likely then need to integrate to a microcontroller/microprocessor for WiFi and website.

Doubt there is anything off the shelf that will do what you want.

That's enough to get you started.


Bman, You can use PIR sensor, which works on hot body radiation detection or else also you can use IR sensor.

  • \$\begingroup\$ hi will this work if I put it inside the room and monitor something outside? \$\endgroup\$ – bman Aug 14 '16 at 12:44
  • \$\begingroup\$ It seems that @bman wants to detect through a wall, which PIR will not typically do. A very good (and expensive) IR sensor might. \$\endgroup\$ – David Aug 14 '16 at 12:59

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