Sensors are used in many places. Nowadays, with the maturity of technology and scientific progress, various products are also developing towards intelligence. For example, sensors have been upgraded. The emergence of intelligent temperature and humidity sensors has made the function of Play better.
As an important tool for obtaining information, sensors play an important role in industrial production, science and technology and other fields. However, with the rapid development of microprocessor technology and the development of automation and intelligence in measurement and control systems, traditional sensors have been combined with various microprocessors and connected to the network to form information detection, signal processing, and logical thinking. Smart sensors with a series of functions.
Intelligent sensor (intelligent sensor) is a sensor with information processing function. The smart sensor has a microprocessor, which has the ability to collect, process, and exchange information. It is the product of the integration of the sensor and the microprocessor. Compared with general sensors, smart sensors have the following three advantages: high-precision information collection can be achieved through software technology, and low cost; it has certain programming automation capabilities; and its functions are diversified.
As a tool for humans to obtain information, sensors are an important part of modern information technology. In the traditional sense, most sensors output analog signals, which do not have signal processing and networking functions. They need to be connected to specific measuring instruments to complete signal processing and transmission functions. Smart sensors can process raw data internally, and can exchange data with the outside world through standard interfaces, and change the sensor's work through software control according to actual needs, thereby achieving intelligence and networking. Due to the use of standard bus interfaces, smart sensors have good openness and scalability, which brings a lot of room for development to the expansion of the system.
Smart sensor is a new type of sensor that can sense and detect certain information of the measured object; can learn, reason, judge and process signals; and have communication and management functions. Smart sensors have the ability to automatically zero, calibrate, compensate, and collect data. Its ability determines that the intelligent sensor also has higher accuracy and resolution, higher stability and reliability, better adaptability, and is also very cost-effective compared to traditional sensors.
The first intelligent temperature sensor introduced in the mid-1990s uses an 8-bit A/D converter, which has low temperature measurement accuracy and can only achieve a resolution of 1 degree. Foreign countries have successively introduced a variety of high-precision, high-resolution intelligent temperature sensors, using 9-12-bit A/D converters, with a resolution generally up to 0.5-0.0625 degrees. The DS1624 high-resolution sub-intelligent temperature sensor newly developed by the American DALLAS Semiconductor Company can output 13-bit binary data with a resolution of up to 0.03125 degrees and a temperature measurement accuracy of plus or minus 0.2 degrees. In order to improve the conversion rate of the multi-channel intelligent temperature sensor, some chips also use high-speed successive approximation A/D converters. Take the AD7817 5-channel intelligent temperature sensor as an example. Its conversion time for local sensors and each remote sensor is only 27US and 9US respectively.
The test function of the new intelligent temperature sensor is also continuously enhanced. For example, the DS1629 single-wire temperature sensor adds a real-time calendar clock (RTC) to make its functions more complete. DS1624 has also increased the storage function, using the 256-byte E2PROM memory inside the chip, which can store user's short messages. In addition, intelligent temperature sensors are developing from single-channel to multi-channel, which creates good conditions for the research and development of multi-channel temperature measurement and control systems.
Intelligent temperature sensors have a variety of working modes to choose from, mainly including single conversion mode, continuous conversion mode standby mode, and some have added low temperature limit expansion mode, which is very easy to operate. For some intelligent temperature sensors, the host (external microcomputer or single-chip microcomputer) can also set its A/D conversion rate resolution and maximum conversion time through the corresponding registers.
The bus technology of the intelligent temperature sensor has also been standardized and standardized. The main buses used are single-wire (1-WIRE) bus, I2C bus, SMBUS bus and SPI bus. As a slave, the temperature sensor can communicate with the host through a dedicated bus interface.
The emergence of these new functions will enable the intelligent temperature and humidity sensor to have more functions, to better monitor temperature and humidity, to better serve us, to achieve intelligence and standardization, and to bring extremes to the production work. Great convenience. So in general, intelligent temperature and humidity sensors have many functions, which are indispensable for production needs.
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