Which type of IoT device is designed to measure environmental variables such as humidity and temperature?

The choice focused on sensors is accurate because sensors are specifically designed to detect and measure physical properties of the environment. These devices collect data related to various environmental variables, including humidity and temperature, and then convert this information into a format that can be easily understood and processed by other devices or systems.

In the context of the Internet of Things (IoT), sensors play a crucial role as they provide the necessary data that enables automation, monitoring, and data analysis. By accurately measuring conditions in a given environment, they allow for informed decision-making and intervention when necessary.

Other devices listed, such as a System on Chip (SoC), are integrated circuits that can run applications and may contain sensors, but they are not specifically tailored for environmental monitoring. Field-Programmable Gate Arrays (FPGAs) are hardware devices that can be configured to perform various tasks but are not inherently built for measuring environmental parameters. Similarly, a hub is used to connect different devices and facilitate communication between them but does not measure variables directly.

Thus, the identification of sensors as the device type responsible for measuring humidity and temperature aligns with their primary function in environmental monitoring within IoT ecosystems.