This article describes the characteristics of the environmental sensors.
That is, when designing environmental sensors, the factors to be considered may not only be as simple as making the sensor chip, but also must coordinate mechanism design, PCB, hardware design, and even software compensation to solve the accuracy of the measured value.
Environmental sensor (environmental sensor) is one of the key components commonly used in IoT design. Generally, environmental monitoring is divided into four main sensors, namely RH/T (temperature and humidity), VOC (volatile organic gas), CO2, and PM2.5, which is always very red. Most of these ICbased sensors currently use "Micro Electro Mechanical" (MEMS) technology.
RH/T temperature and humidity sensor, the most commonly used scene is the home, in addition to the supply chain (eg logistics emphasizes quality, reliability), security control (eg battery status), etc. will also use the sense of RH/T Measurement.
Although the applications of environmental sensors are very diverse, they also encounter many challenges. Environmental sensors are not as easy to do as motion sensors. Environmental sensors usually need to be in contact with the outside air (otherwise it cannot be detected). It is bound to open a mouth on the outer layer of the sensor, and this mouth will involve the same as others. In the device, the interactive influence of other sensors, that is, when designing environmental sensors, the factors to be considered may not only be as simple as making the sensor chip, but also must coordinate mechanism design, PCB, hardware design, and even software compensation. , Solve the accuracy of the measured value.
In addition, the accuracy of environmental sensors is not the same as that of motion sensors. There is an absolute physical quantity that can be known. The value sensed by the environment may be inaccurate due to the influence of other external factors, such as the embarrassment that the temperature shows 30 degrees, but people even wear a jacket.
VOC volatile organic gas sensors also face the problem of inaccuracy affected by external factors, and another big problem of VOC sensors is the recovery ability of VOC sensors. If VOC sensing is detected in high-concentration gases for a period of time , And whether these high-concentration gases may adhere to the sensor, causing damage to the sensor and causing problems in subsequent measurements.
The above-mentioned problems are all considered in the actual design and application of environmental sensors.
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