Apple may in the future expand the list of functions of the HomePod mini smart speaker by adding support
According to Bloomberg, the company has already discussedusing sensors to determine room temperature and humidity. The speaker hardware can also allow the HomePod mini to automatically initiate other actions, such as turning the fan on or off based on temperature.

These functions can be operated using the systemHomeKit, which controls thermostats, lights, locks and other smart home devices. Apple's website already lists about 40 HomeKit-compatible thermostats.
The sensor itself is tiny. It measures only 1.5 x 1.5 mm and is manufactured by Texas Instruments.
Apple will likely activate it in a future major software update due in fall 2021.
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