Sensor to detect a person?

Hi. I am creating a project that will be attached on to a helmet.

I am wondering which sensor would be best to detect when the helmet is being worn by a person.
I was looking into the PIR sensors if those work?

I would suggest an infrared LED beamed from one ear towards the other, and an infrared phototransistor as the receiver.

Should work, probably even in the case of some elected officials...

Do you mean that if a person puts the helmet on his/her head, the helmet will recognize that action?

If so, a microswitch would work fine.

Or maybe some kind contacts in the buckle (if it has one, and if it's important that it's secured)

terryking228:
I would suggest an infrared LED beamed from one ear towards the other, and an infrared phototransistor as the receiver.

Should work, probably even in the case of some elected officials…

LOL

Note: the beam should not be continuously checking, just once per second or so.
Overheating will not happen fast but still

robtillaart:
Overheating will not happen fast but still

Let's not try it on politicians then.
Most of them are hotheads. They will overheat with such a helmet on.

Did you ever got this to work? We want to do the same thing. But questions like...

what if there is one helmet over the other? How can the detector distinguish between a person or an object?

The smallest would be an NTC

Perhaps an acceleromator sensing movement. It could differentiate between someone sticking a towel in the helmet to fool a presence sensor. You might be able to tell if the wearer is asleep :slight_smile: