Published Book on Amazon
|All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 1
|All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 2
출판된 한글판 도서
|최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (상)
|최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (하)
Original Book Contents
A sensor is a device that grasps the state of an object around it and performs a function corresponding to a person's sense. The sensor detects the condition of an object around it, detects the occurrence of an event, senses and measures a variation of quantity, and delivers it with an electric signal or optical signal. There are various kinds of sensors such as a light sensor, a temperature sensor, a gas sensor, a pressure sensor, and a magnetic sensor. There are also passive sensors (camera, MSS, TM, HRV) that passively accept the ambient conditions according to the way they operate, and active sensors (Radar, Laser) that send electromagnetic waves and receive it again.
The followings show examples of several different types of sensors sold on the market. Other than these, there are many sensors that provide various functions, and there are many other sensors that provide the same functions.
Figure 25‑17 Various sensor
The following shows an example of constructing a circuit that connects a specific sensor to the GPIO port of the Raspberry Pi to read the measuring values sent by the sensor into the Raspberry Pi.