History has revealed that how fast our technology has developed. Science has made its trademark in the field of growing technology. Together with humans machine is also getting smarter day by day. Let’s talk about one of such invention called sensors.

Sensor is a micro device which gives an output by detecting the changes in quantities or events that is it detects some input from the environment and respond to it like heat, air, water, sunlight and many more. It basically converts the physical parameter into a signal which can be measured electrically.

There are some factors which are to be kept in mind before choosing the sensor that are the sensors should be reliable that is one can easily depend on them, sensors should be cost effective that is they should be pocket friendly and if one is spending his more amount of money then the sensors should have some advance technology installed.

A sensor with high resolution is preferred as it should be able to detect even slightest of the changes, they should have good calibration that is the device should be stable it should not frequently change the resultant rating. Various types of censors in electronics are Temperature Sensor, IR Sensor, Ultrasonic Sensor, Touch Sensor, Proximity Sensors, Pressure Sensor, Level Sensors, Smoke and Gas Sensors.

On basis of properties sensors can be classified as Primary Input quantity, Transduction principles, Material and Technology, Property, Application. We can say that sensors play the most vital role in the field of security for example fire alarm, there is a sensor present in fire alarm therefore whenever a smoke arises fire alarm automatically gets turned on and blow its siren. Here siren gets on because of the sensor as sensor is able to detect the smoke. In future sensors are going to be high in demand.