In modern industrial production, especially in the automated production process, various sensors are used to monitor and control various parameters in the production process to make the equipment work in a normal or optimal state, and to make the products reach the best quality. From the vast space, to the vast ocean, to various complex engineering systems, almost every modern project is inseparable from a variety of sensors. Therefore, it is no exaggeration to say that without many excellent sensors, modern production will lose its foundation.
As a detection device, the sensor can feel the information to be measured, and can transform the sensed information into electrical signals or other required forms of information output according to a certain rule to satisfy the transmission, processing, storage, and display of information , Recording and control requirements. So we don’t know much about the sensor output options, so the editor of gongwang.com has compiled an article about sensor output options, taking the MaxBotix type ultrasonic sensor as an example.
The key factor
Analog voltage provides range information for linear voltage range
The pulse width uses the digital representation of the pulse output range directly corresponding to the range
The serial data output of the sensor provided by Gongye.com provides asynchronous data at TTL voltage level
The analog envelope output is the smallest filtered output of the acoustic waveform
In MaxboTIx, many of our sensors provide multiple simultaneously available outputs, each of which sends information about the range of the sensor's measurement. Each output format is sent in a unique communication format and has its own unique advantages. This article outlines the benefits and operations of some of these outputs.
Different sensor output options
Most sensors provide three unique range outputs at the same time. The data sheet of the sensor will summarize all the outputs of the specific sensor. Each of these outputs is an electronic data stream representing range readings. The standard output used by MaxboTIx is pulse width, serial data (RS232 type or TTL type), analog voltage, I2C and analog envelope.
Any output format allows you to obtain electronic range information from the sensor and convert it into a readable format. Although each product has its own advantages, some products require more knowledge and equipment. Some outputs are more accurate than others, but initial users may find that more accurate outputs are beyond their knowledge of electronic interfaces and coding.
Analog voltage (AN)
Analog voltage is one of the most popular outputs of our sensors. This output provides range information through the linear ratio of the voltage; where the target voltage increases as the distance from the sensor increases or decreases as the distance decreases. The scale factor between the sensor lines is different, but can be found in the data sheet. Although analog voltage is easy to use, it is the least accurate output.
Pulse width (PW)
The PW pin uses the digital representation of the pulse width output range. The width of the high pulse directly corresponds to this range. A narrower high pulse indicates a lower range, and a wider high pulse indicates a larger range. The pulse will be at a voltage level of 0-Vcc. The precise ratio between uS pulse width and range is listed in the data sheet. Although reading the pulse width requires more advanced hardware than a voltmeter, the pulse width is a more accurate range output.
Serial data (RS232 or TTL)
Most microcontrollers have a built-in UART (Universal Asynchronous Receiver/Transmitter) processor that can be used to read and send serial data. The serial output of our sensor provides asynchronous data of TTL voltage levels. The output is an ASCII uppercase "R" followed by an ASCII character number representing the range. This output will require a properly configured serial terminal program. You can download the terminal program and view the settings in this article. Since the data is presented in binary data format, serial output is the most accurate.
Many of our sensors use the RS232 protocol at the V232 voltage level to output serial data, but some sensors (such as MB7380) output serial data in TTL format. These two protocols differ only at the hardware level, and are basically mirror images of each other. There are many inverters available that can be exchanged between the two protocols. In addition, the HRLV-MaxSonar-EZ series can output any of these formats. The terminal program settings of the two formats are the same.
Simulated envelope (AE)
The analog envelope output is the smallest filtered output of the acoustic waveform. This format is very useful if you want to perform your own signal processing at the expense of more complex circuits. The output allows users to apply their own filtering and target detection schemes. The straight line along the time axis at the bottom corresponds to the distance in a linear fashion, and the height of each peak corresponds to the acoustic return of the target. Generally, higher peaks mean better goals.
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