This clever girl was able to power a flashlight using this principle.
Peltier tiles are marvelous, cheap and simple to produce. If she could power a flashlight with LEDs I am pretty certain human waste heat could power a computer sewn into a vault suit. I imagined the interface to the internal OS to be a simple infrared LED to network the chip into the surrounding shelter.
I've got so many ideas like this and so little time at present. I have to get a couple of things out of the way before I experiment with it.
Notice how the important advances tend to come from teenage girls with 26 dollar budgets but all those billion dollar think tanks have an output that looks like squat, nothing, zip, zero for the past couple of decades? They need to ask this girl to cure cancer next, they should loan her another 26 bucks.