Sensors are devices for detecting, monitoring, and responding to physical parameters such as temperature, pressure, humidity, and motion. They are indispensable components of many practical work systems Sensor and are widely used in industry, consumption, automotive, medical and military applications. In the past, the data obtained from the sensor is sent directly to the central control unit, and then the central control unit may use the external hardware component or digital logic to perform post-display or display of the sensor data.
The rapid increase in the complexity of the application of the sensor makes it possible to embed more powerful intelligence into the sensor interface. Many applications use multiple sensors to obtain a variety of measurement data, and the use of very advanced methods of data processing. In some cases, signals from multiple sensors must be processed at the same time, and the same microcontroller Temperature Sensor must be used, which can be referred to as 'sensor signal fusion'. Each type of sensor has its own signal characteristics, and it is necessary to extract useful information from different post-processing systems, which increases the amount of computation and peripheral data processing of the central processing unit (CPU). Sensor signal processing includes a wide variety of embedded applications, but can be generally defined on behalf of the sensor processing system features a common signal chain.
It is also useful for the processor to monitor the sensor signal and to detect errors that may cause a complete system failure. After detecting an error condition, the system can be completely turned off or switched to the redundant backup sensor. If you add a step to the error detection process, you can predict it before the actual error occurs. This will greatly simplify the maintenance and maintenance Speed Sensor of the field hardware. In many applications, the sensors are actually scattered over a wide area, Large buildings or factories, or scattered in different parts of the car. For such a distributed system, centralized processing / control methods are often proven ineffective, or in the best case is still ineffective. To reduce the pressure on the central control unit in processing and data storage, it is best to distribute the processing power to multiple proximity sensors, or even microcontrollers that are integrated with the sensor. However, this distributed sensor processing method requires a variety of powerful signal conversion and communication around.
A sensor is a device for converting a physical parameter of interest into an electronic signal. Smart sensor processing applications often use multiple sensing components that belong to the same type, such as multiple thermistors in air conditioning systems, or thermocouples and carbon monoxide detectors in different types, such as an industrial machine. Each type of sensor has its own set of signal adjustments and data after the system requirements, according to the measured physical parameters of the sensing components for general classification, such as temperature sensors, pressure sensors, flow sensors, gas / chemical sensors, sound / Ultrasonic sensor, position / motion sensor, accelerometer, image sensor, light sensor.
The signal conditioning circuit regulates the output signal of the sensing component to the extent that the remaining electronic circuitry or application software can handle. The specific signal conditioning circuit required for the sensor application depends on the type of sensor used. For example, a sensor produces an output voltage based Pressure Switch on the measured physical parameter size, which requires signal conditioning, which may be different from the sensor that produces a variable resistor.