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Touch Sensing (Capacitive, Proximity, others?)

All,

I am working on an embedded application where I want the device to turn on (microcontroller wakes up) when the user touches the device
with their hand. We want to conserve power and don't want to have to poll the touch sensing device to know when to wake up. Then after
this step we want to continue checking to be sure the user continues touching the device.

Here are the two requirements:

1.) The product should turn on when the user touches the product.

2.) After the device is fully powered on the microcontroller will keep checking to make sure the user is still making contact with the
system. When the user stops touching the system the microcontroller will sense this and change states and go back to sleep.

What are some options for this?

1.) Proximity Sensor?

2.) Capacitive Sensor?

3.) Anything else?

Thank you for any comments on this.  Maybe a part number recommendation?

Thanks.

-Mike