As we’ve seen in the sections earlier, IoT covers both Hardware as well as software, both go hand in hand for a smart device to work. So in this section, we’re going to cover the most important parts of the IoT physical layer which are sensors and Actuators. These are the devices that actually come in contact with the physical environment. Sensors and Actuators are everywhere around us, in every smart device you’ll see at least 2-3 sensors or actuators, and in this section, we’re going to cover the most used sensors while building an IoT project.
