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Metriful is launching a $39 “Sense” indoor air quality sensor module that works with the Raspberry Pi and other I2C-enabled systems. Other sensors include temperature, humidity, air pressure, light, and sound.

Cloud-init is a standard—it would not be a stretch to say it is the standard—that cloud providers use to provide initialization and configuration data to cloud instances. It is used most often on the first boot of a new instance to automate network setup, account creation, and SSH (secure shell) key installation—anything required to bring a new system online so that it is accessible by the user.