Which is why smoke detectors are ... No need to buy a brand-new, expensive Nest protect, when all it takes it a sensor or two and a Raspberry Pi to hack the fire alarm that already sits in the ...

On April 3, Nest Labs halted sales of the Nest Protect smoke and CO alarm and deactivated the hush feature, called the Nest Wave, over concerns that the alarm could be unintentionally deactivated.

Fadell is the electric CEO of Nest, which makes an Internet connected thermostat and smoke/carbon monoxide detector. Prior to founding Nest, he led Apple's iPod group, and worked on the iPhone.