人可以通过眼、耳、鼻、舌等感觉器官感知周围环境的冷、热,味道的咸、甜,声音的大小等。当今,在电子领域也诞生了许多新颖的器件,能将光亮、温度、湿度、磁场以及空气中某种气体含量的多少感知到并转变为电信号,这种微弱电信号的变化再经过电路进一步处理,就可以实现各种自动控制和监控报警了。 People can sense the cold, heat, taste of the salty, sweet, the size of the sound through the eyes, ears, nose, tongue and other sensory organs. Nowadays, there are many new devices in the field of electronics that can sense and convert the brightness, temperature, humidity, magnetic field and the amount of certain gas in the air into electrical signals. The changes of these weak electrical signals go through the circuit Processing, you can achieve a variety of automatic control and monitoring of the alarm.