Temperature is a physical quantity that measures the heat and cold of an object. In people's production and scientific research projects, many are carried out at specific temperatures, which is closely related to people's lives; humidity refers to the relative humidity of the air, generally used as %RH express. Temperature and humidity are closely related.
When the temperature is too high or too low, it will directly affect the body's temperature regulation function, thus affecting our daily life. The most intuitive thing is that people will sweat when the weather is hot in summer, and get goosebumps when it is cold in winter. In spring and autumn, people are most comfortable when the weather is suitable. According to relevant data analysis statistics: the human body feels most comfortable when the ambient temperature is 24-26 ° C and the humidity in the air is 40-60 % . Therefore, it is necessary to reasonably adjust the indoor temperature and humidity to keep the human body temperature at a suitable temperature .

Temperature and humidity sensor is a device that measures temperature and humidity and transmits the data to other terminals. This sensor has the characteristics of linear response, wide measurement range and high accuracy, allowing us to understand environmental conditions more accurately. It is widely used in meteorology, greenhouse, industrial control , indoor constant temperature, pharmaceutical, food processing and other fields. Temperature and humidity sensors can measure the temperature and humidity of the surrounding environment and convert the data into electrical signals. Common temperature and humidity sensors include thermocouples , resistors , piezoelectric and other types. Among them, the resistive temperature and humidity sensor is the most common one.

With the help of temperature and humidity sensors, we can realize many important applications. For example, in agricultural production, through real-time monitoring of temperature and humidity data, we can understand the optimal conditions for crop growth, adjust environmental factors, and promote crop growth. In industrial production, temperature and humidity sensors can be used to ensure the stability of the production process and the consistency of product quality. ISWEEK Industry and Procurement Network represents a variety of temperature and humidity sensors. Here are some common sensors:
French Humirel digital output temperature and humidity sensor HTU21D : specially designed for low-power, small-volume, low-cost applications , the power supply voltage is between 1.5V ~ 3.6V , and its humidity accuracy is ± 2% under 10%RH ~ 95%RH RH, temperature accuracy is ± 0.3 ℃, can work in the humidity of 0 ~ 100% RH and the temperature range of -40 ~ 125 ℃, and is used in engines and motor vehicles, medical, industrial control, consumer electronics and household appliances other fields.

French Humirel capacitive humidity sensor - HS1101LF : has high accuracy of ± 2%RH , can work in the humidity of 1 ~ 99%RH and the temperature range of -60 ~ 140 ℃; the humidity output is minimally affected by temperature and the response time is 5s , anti-condensation, anti-static, dust-proof, and effectively resistant to various corrosive gas substances. HS1101LF can be used in temperature and humidity instruments , office automation , automobile cab air control, household appliances, industrial process control systems and other fields.
South Korea 's Samyoung 's temperature and humidity sensor module - HTW-211 : has a solid and robust molded package, which can completely replace HTG3515 and HTG3535 . It has internal reinforced protection through coating materials , has good tolerance and is easy to install; in addition, its typical operating voltage It is 5VDC , the humidity accuracy is ± 3%RH, the temperature accuracy is ± 0.3 °C, and it can work in the humidity range of 0 to 100%RH and the temperature range of -40 to 85 °C; it can be used in mass production and requires high measurement accuracy. The place