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Most people do not understand the knowledge points of this article "what is the concept of sensors on the Internet of things", so the editor summarizes the following contents, which are detailed and clear, and have a certain reference value. I hope you can get something after reading this article. Let's take a look at this "what is the concept of the Internet of things sensor" article.

Overview of sensors

Sensors are as important to every Internet of things application as the Internet. Imagine an Alexa or Google Home without a microphone: it doesn't work. People will not be able to interact with the device, or other types of sensors (such as keyboards) will be needed to obtain user input. At the same time, the application indicates which sensor is needed. Smart home devices without microphones will be useless. Through voice interaction with the device, users can still use the device in many different places or while participating in other activities, such as cooking. The sensors in the Internet of things applications are the eyes, ears and nose of the software. Like organs that allow humans to interact with the world, sensors are a way for software to detect and interact with the physical world.

Which sensor should I use?

The use case determines which sensor should be used. Plan to build smart devices to control the temperature? Use a thermometer. Trying to find someone approaching your house? Motion sensors can be used, but what if a nearby cat keeps tripping over it, or what if robbers destroy the sensor? Motion sensors do not provide very practical information. Using the camera, the thief's behavior will be recorded, and the algorithm behind the camera may eliminate the interference of cats. On the other hand, the camera that controls the automatic door may be too large, and the motion sensor will suffice.

Sensors are an important choice because they identify other important decisions in the Internet of things stack. Cameras and microphones require a lot of power and bandwidth to operate effectively, and should also use wifi and be equipped with large batteries or sockets. In contrast, motion sensors require very little bandwidth and only standby power. GPS modules almost always have to be battery-powered or severely limited.

Sensors also play an important role in the relationship between each other. GPS with a battery does not always charge or replace the battery in a convenient place. In this case, an accelerometer can be used to expand the device. In this way, the GPS must be turned on only if the accelerometer detects that the device is moving. In addition, unless there are multiple sensors to collect information, the information may be incomplete. Weather is a combination of temperature, humidity, air pressure and water sensors. More information, such as wind speed, can be added for more predictive analysis. Sometimes, the same sensors work with each other. For example, a barometer that measures air pressure is usually used to measure height. However, the air pressure is affected by the weather, so another sensor is needed to receive the reference pressure at a known height.

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