Practical Internet of Things with JavaScript

Smart device

Smart devices are hardware entities that consist of a sensor, or actuator, or both, any micro controller or micro processor, in our case, a Raspberry pi 3.

A sensor is an electronic component that can sense or measure a physical property and relay it back to a microcontroller or a microprocessor. The data relayed back can be periodic or event-driven; event-driven as in when there is change in data only. A temperature sensor such as an LM35 or DHT11 is an example of a sensor.

An actuator is also an electro-mechanical component that can trigger actions in the real world. Generally, the actuators do not act by themselves. A microcontroller, a microprocessor, or an electronic logic sends signals to the actuator. An example of an ...