We have already introduced many applications of the HART protocol. Here we mainly discuss another application of the HART protocol in the industry-the application design of the modem chip SYM20C15. In industrial control, the field instruments generally use 4 ~ 20mA standard. In order to expand the digitization function of existing instruments so that they can not only transmit measurement data, but also transmit diagnostic information, the existing four ~ 20mA increase the digital communication
Next, we will introduce the specific concepts and some applications of the HART communication protocol. Then we will analyze the products related to the RS232 converter. Help you understand the concept of the HART communication protocol. First, let's take a look at the specific content of HART. HART (Highway Addressable Remote Transducer), an open communication protocol that can address Remote sensor express connect, it is a communication protocol bet
Sensor
Through the mobile phone hardware to learn the light sensor, acceleration sensor.
1. What are the main uses?
To shake: the acceleration of a wobble; a wild drag.
2. What are the common sensors?3, how to use these sensors?code example (the icon rotates in reverse according to the phone):/ * Implement Sensoreventlistener, rewrite 2 methods * / Public class mainactivity extends appcompatactivity implements Sensoreventlistener { PrivateImageView Msensorimagev
differential amplifier to suppress the common-mode signal, the better the amplifier's performance. When the operating amplifier circuit is completely symmetrical, the common mode signal voltage amplification acm=0, the common mode rejection ratio ccmr→∞, this is the ideal situation, in fact, the circuit is completely symmetrical is not exist, the common mode rejection ratio can not tend to infinity.What factors affect the common-mode rejection ratio of the
special effects processing.Raw RGB has only one color per pixel (one in R, G, b);RGB each pixel has three colors, each value is between 0~255;During the test of the mobile camera, the data from the sensor is raw (raw RGB), and the color interpolation becomes RGB.Sensor output data format, mainly divided into two types: YUV (more popular), RGB, this is the sonsor data output; The GRB is raw RGB, which is the data obtained by the sensor's Bayer array (each tr
The HART protocol is a communication protocol and is generally used in bus protocols. Now let's analyze this HART protocol. First, let's give a brief introduction to the basic concepts of this Protocol. We all know that in sensor applications, the HART protocol is very important. Therefore, when we define the sensor, we cannot do without the connection with the sensor.
1. HART (Highway Addressable Remote Transducer), an open communication protocol tha
seems to be developing .』
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Back then, in 1927, wood (R. W. Wood) and lums (A. L. Loomis) first used high-power ultrasound. The blue-jet-type Z transducer is used in combination with high-power vacuum tube to generate high energy in the liquid, which causes the so-called cavity phenomenon.
There is an ultrasonic diet method that uses this method. Ultrasonic Waves generate alternating positive and negative pressures in each vibration cycle, so t
Today's smartphones have integrated a wide range of sensor devices, such as temperature sensors, barometric sensors, and light sensors. Each sensor has its own role in the actual use of the process. Talk about the use of azimuth sensors today.The azimuth transducer is orientation sensor. Its data are calculated using accelerometers and geomagnetic field sensors. The interpretation of the azimuth sensor that can be found on the Internet is:Azimuth sens
aregenerated by events and keystrokes that are usually generated by the touch screen and are the most common. But in fact inputevent not only have these two kinds. Because the android system can run a very rich type of device, on different devices corresponding to different hardware, there must be a different input events,inputevent Depending on the input source of the event, it can be divided into the following categories (not all):Sensor inputevent ( Tra
switched to FST.Finite automaton algorithm (fst,finite State transducer): Constructs a least-direction-free graph by entering an ordered string. By sharing the prefix to save space, memory holds the prefix index, and the disk holds the suffix word block. The specific implementation of Lucene can be seen in the source code.Lucene has so frequent version upgrades, I have been specialized in the play-like care of this upgrade, because there is a problem
Composition more readable and easier to name we is going to ceate a compose function we can use to avoid have To manually nest our transducer calls.We ' ll also go over semantically naming your compose functions for extra readability.Nested Style:Import {doublethenumber, evenonly} from ". /utils "; Const Map= XF = Reducer = { return(accumulation, value) = { returnReducer (accumulation, XF (value)); };}; Const filter= predicate = Reducer = { retur
Gesture operation can be said to be a smart phone charm, the first two sections to explain the two interesting gestures, put them in the game, greatly enhance the game's playful and interesting. This section will continue to introduce another magical thing about smartphones: sensors.
first, what is the sensor
The so-called sensor is to be able to detect such as light, heat, temperature, gravity, direction and so on devices.
Ii. What are the sensors that Android offers
1. Acceleration sensor
the dictionary function, summarized as follows.
A brief analysis of the principle of 3 FST
The data structure that Lucene uses heavily starting from 4 is FST (finite state transducer). FST has two advantages: 1 space footprint small. By reusing the word prefix and suffix in the dictionary, the storage space is compressed, 2 the query speed is fast. The query time complexity of O (str).
The following is a brief description of the FST Construction pro
the posterior probability of the phoneme sequence pairs of word sequences; P (W) The probability of the occurrence of a sentence, called a language model. These probabilities are all derived from the previous "training" process.At present, the decoding of speech recognition is generally based on the weighted finite state converter (weighted finite states transducer).A weighted finite state converter is an empowering and direction graph, each of its n
, as are Windows 8. "Application development will move to the network," Microsoft said, "and build a Windows Store."
Windows 8 Flat specification parameters are not abnormal
We look forward to Windows 8 tablet because it is fundamentally different from other competitors such as Galaxy Tab or the BlackBerry Playbook ipad. Specifications are as follows: one GHz processor, 1GB memory, 802.11b/g/n Wireless and multi-capacitive display.
Windows 8 Tablet
open WPS Mobile version, at any time to deal with some urgent matters.
Free time to read
Christmas, New Year's Day is the annual tourism small peak, travel more people, travel always have a variety of leisure time, such as airport terminals, high-speed rail time, as well as travel back to hotels, restaurants rest time. This time is more boring, in order to enrich the travel life, you might as well take out your flat, run WPS Mobile version of Office software, open the existence of
u disk mainly has two kinds of packaging structure:
1. Traditional for PCBA package structure.
2. Black Colloid package structure. The interior is mainly composed of a PCB board + main CONTROL + crystal oscillator + capacitive capacitor +usb head +led head +flash (Flash memory), the following figure:
PCBA Package Black Colloid Pack
(PS: Constant Add letter U disk specified chip packaging structure)
Features: simple process and low cos
What is the application of the Touchpad function in the windows8 system ? The touchpad uses the fingers ' sliding operation to move the cursor's input device. When the user's fingers close to the touchpad will change the capacitance, the touchpad itself will detect the amount of capacitor change, converted to coordinates. The touchpad is a capacitive sensor to learn about the movement of the fingers and is insensitive to finger heat. Its advantage is
the driver is the specific process of how to implement the access. The main driver consists of two parts, the first is the control register of the SOC programming, according to the bus output timing and command, the successful interaction with peripheral devices; the second is to process the data obtained in the first step and provide the application layer with data in a specific format.
A. The driving process of different bus devices is not the same, this is easy to understand, USB
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