In other words, when designing environmental sensors , the factors to be considered are not simply about making the sensor chip well. It is also necessary to coordinate the design of the mechanism, PCB, hardware design, and even use software compensation to solve the problem of the accuracy of the measured values.
Environmental sensors are one of the key components commonly used in IoT design. Environmental monitoring typically involves four main sensors: RH/T (temperature and humidity), VOCs (volatile organic compounds), CO2, and the ever-present PM2.5. These IC-based sensors are currently mostly implemented using microelectromechanical systems (MEMS) technology.
RH/T temperature and humidity sensors are most commonly used in homes. In addition, RH/T sensing is also used in supply chains (e.g., logistics that emphasizes quality and reliability), safety control (e.g., battery status), and other applications.
While environmental sensors have a wide range of applications, they also present numerous challenges. Unlike motion sensors, environmental sensors are not easy to manufacture. They typically require contact with the outside air (otherwise they cannot be detected), necessitating an opening in the outer layer of the sensor. This opening, in turn, involves interactions with other sensors within the same device. Therefore, designing environmental sensors involves more than just making a good sensor chip; it also requires coordination with mechanical design, PCB design, hardware design, and even software compensation to ensure the accuracy of the measured values.
Furthermore, the accuracy of environmental sensors is not like that of motion sensors, where there is an absolute physical quantity that can be determined. The values sensed by the environment may be inaccurate due to the influence of other external factors, such as the awkward situation where the temperature is displayed as 30 degrees Celsius, but people are wearing coats.
VOC (volatile organic compound) sensors also face the problem of inaccuracy due to external factors. In addition, another major problem with VOC sensors is their recovery capability. If the VOC sensor detects in a high concentration of gas for a period of time, these high-concentration gases may adhere to the sensor, causing damage and leading to problems in subsequent measurements.
These are all issues that need to be considered when designing and applying environmental sensors in practice.
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