Help regarding breathing sensor

[mod edit: updated thread title to include the topic of this thread]

There are probably a thousand ways to detect breathing. We need more details, e.g.:

• How near (or far) from the person will the sensor be located?
• Do you need to distinguish between breathing through the nose or the mouth?
• Will it be possible to attach the sensor to the person to be monitored by a rig?
• ...

Once you've sorted out the requirements I'm sure we'll fins a suitable sensor.

 

Contactless measuring of breathing seems to be a quite complex topic, see here.