rssi units

In the wireless field, many people do not understand RSS and rssi exactly what kind of difference, and the textbook does not give a more specific explanation. The same many documents are vague and uncertain, some use RSS, some use Rssi, Confuse students who have started or studied for years. Below, we will briefly explain the two terms above. Rss:received signal strength, translated is to indicate the r

Why the wireless signal (RSSI) is a negative answer: in fact, the final analysis of why the wireless signal received is negative, this is not easy to understand more. Because the wireless signal is many MW level, so it has been polarized, converted to dbm, does not mean that the signal is negative. 1mW is 0dBm, less than 1mW is a negative number of dbm. Figure out the definition of signal strength: RSSI (

Using Corelocation.framework is easy to scan to get peripheral Bluetooth devices, Apple open source code airlocate has a specific implementation:Https://developer.apple.com/library/ios/samplecode/AirLocate/Introduction/Intro.htmlThe obtained ibeacon is expressed in Clbeacon in Corelocation, which has the RSSI value (Received signal strength), which can be used to calculate the distance between the transmitting end and the receiving end.Calculation for

Seven CSS units that you may not know, css units If you are a front-end development engineer, px and em are usually used frequently. However, the focus of this article today is to introduce some units that we seldom use or even hear about.I. Review em Because font-size is inherited, the deeper the layers, the larger the font.Ii. rem Although the above use of em

ObjectiveWith the decline in the price of computer hardware and machine, and the gradual simplification of the use method, more and more families now have more than two computers. Because the number of computers in a home area network is generally not large, there is no need to adopt a client/server approach. In the case of a large number of home computers, the computer is connected to form a small local area network, you can share resources (files, printers, modems and ISDN), but also to save m

Sku=stock keeping unit (in stock units). That is, inventory in and out of the unit of measurement, can be in pieces, boxes, pallets and other units. SKU This is a necessary method for the logistics management of a large supermarket chain of DC (distribution center). Has now been extended to the product uniform number abbreviation, each product should have a unique SKU number. Item: For a commodity, when its

When we are lazy, we will say that the network bandwidth is 10 MB. Do not assume that the maximum download traffic can reach 10 MB of files downloaded per second. It is actually 10/8 = 1.25 MB. The reason is that the bandwidth unit is different from the hard disk unit. Misunderstanding: whether KB is equal to KB I often encounter such a problem. If we clearly apply for a MB bandwidth optical fiber, but when I download software from a local website, the download speed can only reach 10 MB, th

Small programs for converting units of square meters, acres, and hectares implemented by javascript, and converting units of javascript Javascript converts square meters, acres, and hectares. You can use the url to pass parameters to specify the value of the input box as the value of any medium unit. The source code is as follows: A unit conversion tool written in Javascript Your program is not difficult,

This article mainly describes the CSS in the window units and percentage of the use of units, is the basic knowledge of CSS primer learning, the need for friends can refer to the following Windows (Viewport) units Windows (Viewport) units are relative units, meaning they ha

This is Solidity Tutorial series article 7th introduces the etheric units and time units, series with you to thoroughly understand the solidity language.For a complete list of articles in the solidity series, see Category-solidity.Write in frontSolidity is the Ethereum Smart Contract programming language, you should know about Ethereum and smart contracts before reading this article.If you don't understand,

This is Solidity Tutorial series article 7th introduces the etheric units and time units, series with you to thoroughly understand the solidity language.Write in frontSolidity is the Ethereum Smart Contract programming language, you should know about Ethereum and smart contracts before reading this article.If you don't understand, it's recommended that you look at Ethereum first.Subscribe to the Blockchain

/c/2008/11/kiy1a50ewiiggr14.asp CSS Length Units In CSS, there are two types of length units, absolute length units and relative length units respectively. Absolute length Unit Absolute length units are divided into in (inches), cm (cm), mm (mm), pt (LB), PC (PICA). Among th

Linux shows that all output fields are automatically scaled down to a minimum of three digital units and display units for printing[Email protected]:~$ free-h Total used free shared buffers cachedmem: 3.0G 1.4G 1.6G 7.1M 62M 621m-/+ buffers/cache: 715M 2.3GSwap: 3.8G 0B 3.8g[ Email protected]:~$ free--human

Learning html (fourteen) units and values from scratch, and starting from scratch html unitsI. color value 1 Color value Color settings on webpages are very important, including the font color, background-color, and border color. There are also many ways to set the color: 1. English command color This setting method is often used in the previous sections: p{color:red;} 2. RGB color This is consistent with the RGB color in photoshop, which is determine

PackageCom.hujl.util;ImportAndroid.content.Context; Public classDensityutil {/*** Switch from DP unit to PX (pixel) According to the resolution of the phone*/ Public Static intDIP2PX (Context context,floatdpvalue) { Final floatScale =context.getresources (). Getdisplaymetrics (). density; return(int) (Dpvalue * scale + 0.5f); } /*** According to the resolution of the phone from PX (pixel) to the unit to become DP*/ Public Static intPx2dip (Context context,floatpxvalu

One, CSS length value em relative to the parent element's font size ex height relative to lowercase "x" gd Generally used in East Asian typography, this is not related to English rem relative to the root element font size VW relative to the view Window width: Window width is 100vw vh relative to the window height: 100vh vm Relative

This article reprinted to http://blog.csdn.net/fanyuna/article/details/2403266330px turns into points = 22 points = Second points = (pixels/96) *72 = (30/96) *72 = 22.5 lbs Chinese font size vs English font size (lbs) vs Pixel value correspondence: Eighth = 5 lb (5pt) = = (5/72) *96=6.67 =6px (pixel) Number seventh = 5.5 lb = = (5.5/72) *96=7.3 =7px (pixels) Small six = 6.5 lb = = (6.5/72) *96=8.67 =8px (pixels) Sixth = 7.5 lb = = (7.5/72) *96=10px (pixels) Small Five = 9 lb = = (9/72 ) *9

What is REM Maybe you've heard "R.E.M" before you use the radio or other music players. The word. In the eye of the band, the word is the abbreviation for "The rapid movement of the eyeball during light sleep", whereas in CSS, REM represents "an EM unit based on the root element". He won't let you abandon your religious beliefs nor will you believe the man who is far away from the moon, but it can help you achieve a harmonious and smooth design. According to the definition of 1rem in the code:

Today we have an in-depth look at REM units, which are now supported by excellent browsers, and have some compatibility options to help you use it in the lower version of IE. What is REM Maybe you've heard "R.E.M" before you use the radio or other music players. The word. In the eye of the band, the word is the abbreviation for "The rapid movement of the eyeball during light sleep", whereas in CSS, REM represents "an EM unit based on the root element"

One, n more chatterSome of the new units in the CSS3 were introduced in the spring of last year, see: CSS length values and time, frequency, and angle units. Obviously, it mentions the unit VW, VH, which is to be lamented in this article, see:But "I see you" is not the same as "I Touch You". Coincidentally, a coincidence, recently with these two units to see. Rou