According to this post from the iDownload blog Apple’s HomePod Mini has a Temperature and Humidity Sensor.
Made by Texas Instruments and measuring 1.5 x 1.5 millimeters, the secret sensor is embedded in the bottom edge of the fabric case, near the speaker’s power cable, meaning it’s meant to measure the external environment rather than the temperature of the internals.
I hope Apple does decide to support temperature and humidity checking and even device connectivity support related to controlling temperature. I’m still really enjoying my HomePod Mini; so much so that I had decided to eventually get a pair of the now discontinued HomePods. Instead, I’m thinking about getting a second HomePod Mini and pairing it. No, the HomePod Mini is not as good a sound as my stereo, but my stereo is a long way from me, and I likely won’t have access to it for years, and a pair of them would provide stereo.
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