How to Develop for Esp8266 on Raspberry Pie

Step 1: set up the raspbian operating system

The first thing you need to do (unless you are installing into an existing environment) is to download ind and install the latest raspbian OS on the SD card. If it is a new installation, you need to extend the file system and use raspi config to set the locale / time zone / keyboard. For more information on how to do this, see here.

When finished, open the terminal and enter the following command-

sudo apt-get update

sudo apt-get dist-upgrade

Sudo apt get install build essential srecord Unrar free Autoconf automake libtool bin GCC G GPERF flex bison texinfo gawk ncurses dev libexpat dev python python serial sed Git

After that, you have successfully set up the operating system and the necessary prerequisites.

Step 2: Step 2: get and build the ESP open SDK

The next step is to download and install the SDK source. To do this, enter the following terminal command-

cd/opt

sudo git clone --recursive https://github.com/pfalcon/esp-open-sdk.git

cd esp-open-sdk

Here we can edit the makefile and select the SDK version of our supplier. (at the time of writing this article, the current version is 1.5.2). If you have any questions, please leave. After completion, return to the terminal and enter-

make

The build takes about 2 hours, so this is a good time to get the build

Step 3: set path

ESP open SDK is now installed. In order to use it, the file must be in your path. To do this, you can edit the file / home / pi /. Profile in the editor (photo), or open the terminal and enter the following command-

You can now log off (or restart) and cross compile

Step 4: test the compiler

Now that we have installed the tool chain, his next step is to test it. (note that this is optional, but highly recommended. First, let's download the code example. Open a terminal and enter the command-

Now, in your favorite text editor, open makefile for the 'blinky' project at / sourcecode examples / blinky / Makefile, and-

Change the xtensa_tools_root variable to / opt / ESP open SDK / xtensa-lx106 - elf / bin

Change the sdk_base variable to / opt / ESP open SDK / SDK

Now save the makefile, then return to the terminal and execute-

CD source code example / flashing

make

If everything goes well, make should work normally. If there is a problem-

Check your path (echo $path) to make sure it can be compiled by the compiler

Check the makefile of blink to verify that the path of the tool and SDK is correct

Now you can refresh the sample to the ESP module. This varies from module to module, but usually you will-

When connecting the ESP module to the serial adapter, be careful to supply only 3.3vdc to the esp8266 V pin (some serial adapters have a separate 3.3V pin and others have jumpers, see the photo for these two examples)

Start ESP with gpio0 pin grounded

Now plug the UART adapter into your raspi USB port from the 'blinky' project terminal

Enter the command sudo make flash

If successful, you should see the firmware pushed at the command prompt. You can test the program by connecting a red LED and 1K resistor in series between gpio2 and the ground, as shown below. When booting esp8266, the LED should flash.

Step 5: additional tools: Eclipse IDE and espexplorer

Now that you have a tool chain to develop your own esp8266 firmware, the next thing you need is the IDE. I recommend eclipse. Installation is easy. Just open a command prompt and type-

sudo apt-get install eclipse-cdt

This will take some time to download and install. But in the end, you will get one of the most useful and powerful ides available anywhere!

For Lua development on esp8266, another tool you need is espexplorer. The only requirement is Java (Java will be installed by default anyway). To install esplorer-

Download the espexplorer.zip package (Blue Download button) from the home page and place the files in the home directory on the terminal

In the terminal, execute the following commands

Unzip espexplorer.zip

sudo mv ESPlorer/opt/

sudo chown -R pipi/opt/ESPlorer

That's it! To run espexplorer, just open a terminal and run it-

java -jar/opt/ESPlorer/ESPlorer.jar

To connect to the esp8266 using nodemcu, simply insert it, select your serial speed (selected at compile time), and then click the connect button. You should see the Lua prompt and possibly file system or heap data, depending on your firmware. (see Figure)

You can use espexplorer to upload Lua scripts and run commands interactively on esp8266. Here is a very good article on using espexplorer, Lua and esp8266.

Step 6: reward: launch your own nodemcu firmware!

Note - this is a more advanced example, assuming you know something about esp8266, nodemcu, Lua and espexplorer. In short, if you don't know what this is, you may not need it.; -)

One neat thing about esp8266 is the existence of the nodemcu firmware project. This is the open source firmware of esp8266, which allows people to write explanatory code in Lua language and then upload it to esp8266 using the espexplorer application we set up in the previous step. You may already be familiar with it. Most people download and flash their precompiled version into their ESP module. (reasons for this include getting the latest updates and bug fixes and / or increasing stability and reducing memory usage by including only the modules we actually want to use.)

First, we get the source code. Open the terminal and enter the following command-

cd/opt

sudo git clone https://github.com/nodemcu/nodemcu -firmware.git

Clown-r PI: pi / opt / nodemcu firmware

cd nodemcu-firm

Before building the firmware, you need to configure the settings.

Edit the file / opt / nodemcu firmware / APP / include / user_config. H to set the default serial baud rate by setting bit_rate_default (the default is bit_rate_115200). (if the flash size of the module is not automatically detected during the refresh process, you can also set the flash size of the module here.)

Edit the file / opt / nodemcu firmware / APP / include / user_modules. H to select the modules to include. Enable only the features you need. Selecting too much may destabilize your system.

Once you have edited the configuration, you can enter the command from the / opt / nodemcu firmware directory-

make

The blinking is exactly the same as the blinking example, except hook the UART adapter and start the esp8266 with gpio0 ground, and then execute-

Making flash memory

The successful flash memory is shown in the figure above. Once you refresh the module, you need to test it. The easiest way is to connect to it through espexplorer and throw some test commands to the Lua interpreter. Here are some good Lua examples.

If you have completed all these steps, now configure raspberry Pi as a budget development environment to create an application for esp8266.

How to Develop for Esp8266 on Raspberry Pie 1

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How to Set Up the Work and Solution of Raspberry Pie 2 with WPA WiFi Network
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Step 1:yes! After browsing the Internet, I asked this question myself. But the problem here is that no solution really works for me.Research sometimes gets out of control and makes me deviate from my actual goal. This puts me in a situation where I try to solve a problem that didn't exist at first.Therefore, this paper summarizes how to obtain wpa-psk WiFi, establish a network on raspberry PI 2 and run quickly.Let's connect PI 2!Step 2: hardware and software settingsThe reason why the settings are listed here is that some of my hardware has been used for at least 2 years, so it is best to clearly indicate that this solution has been tested and tested on a limited combination of hardware and software.So far, I don't have the latest raspberry PI 3 development board (built-in WiFi), so this version of PI is not within the scope of this ibleSimilarly, the very old versions of raspberry PI a and B have not been tested and are therefore out of scope.The following is a list of the hardware and software I currently use:Raspberry PI 2, model B , with raspbian version of at least 1.5 yearsRaspberry PI 2, model B with raspbian Jessie version of at least one yearConstruction of raspberry PI 2, model B and the latest version of popular retropie OSThe ubiquitous EDIMAX wireless USB dongle, few of whom have been lying in my parts box for several yearsA quick (but outdated) comparison of various raspberry PI boards can be found here.Step 3: get the research back on trackDuring the search, solut I discussed on the Internet and said that some WiFi USB dongles are made of "exotic" chipsets. Configuring them to work normally is not a direct task.If I did have any such chips, that would be right. Exotic USB dongle. However, if my EDIMAX USB adapter has worked properly in the past two years and enabled it to work with newer WiFi networks, I need to study the chipset, then I know my research has deviated from the goal. p》 Therefore, if you have any widely used USB dongle (such as EDIMAX), the solution should work without deep understanding of the details of the chipset and crazy micro level researchStep 4: make changes to the WiFi networkI have made several attempts to make PI use the network upgraded to wpa2-psk [AES] standard with my WiFi.For some reason, all configurations do not work. After more research, I decided to gradually reduce the WiFi network to support the earlier wpa-psk [TKIP] standard.By making some quick changes to the WiFi settings of the router, I can set the home WiFi network to comply with the wpa-psk [TKIP] wpa2-psk [AES] standard.The password (not with the passphrase), which was originally used for the old WEP settings, was nearly 30 characters long, so I decided to keep it for the new WiFi settings as well.Step 5: use WPA_ Fight with the supplicant utilitySince I am using the raspbian OS version with a history of at least two years, I decided to refer to the WPA at that time_ Supplicant document. It can be found locally on my PI./usr/share/doc/wpasupplicant/examplesBased on this document, I am interested in WPA_ The supplicant.conf file has made many settings changes.Anyway, how do I change the settings, PI just refuses to connect to the Internet.Although the configuration file exists in the following path, the output error message often reports a lack of WPA_ Supplicant file or directory:/etc/wpa_ supplicant/wpa_ supplicant.confIn addition, I can use nano to edit this file and configure my WiFi settings.After trying all the configurations listed, nothing has changedThe next available option is by completely ignoring WPA_ The supplicant utility to establish a WiFi connection.Step 6: missing WPA_ Supplicant utility!The next option is to bypass WPA completely_ The supplicant utility and directly use the network interface configuration located at this path:/etc/network/interfacesThis will lead us to the discussion of password vs. password:I want to make this point clear here, because it is an aspect of my complete misunderstanding.Because my WiFi has been set as an outdated WEP standard for a long time, I mistakenly think that the "password" is the same as the "password" setting!incorrect!After more research, it is clear that the passphrase needs to use the current WiFi SSID and password (using a combination) and is known as WPA_ The utility of passphrase is as follows: $ sudo wpa_ passphrase SSID_ NO_ DOUBLE_ QUOTES PASSWORD_ NO_ DOUBLE_ QUOTESNote that you should specify the name of the SSID and WiFi password, not in double quotes.Running the above command produces output similar to the following:network=ssid=MY_SSID_INSIDE_DOUBLE_QUOTES#psk=MY_VERY_LONG_PASSWORD_INSIDE_DOUBLE_QUOTESpsk=9d24321fad5e92de16581d4129g1b8dd2f47c6510953a68e95b1b6d99f5e95efAnd WPA_ Instead of entering the passphrase command, the SSID and the original password are output and enclosed in quotation marks.However, the original password will be automatically commented out with the symbolThe third line of the output, also known as PSK (short for pre shared key), is a passphrase. Unlike the other two outputs, the passphrase is not enclosed in quotation marks.The passphrase will be different from the original password, which is what we will use to configure WiFi settingsStep 7: configure WiFi settingsThe next step is to use the nano text editor to edit the / etc / network / interfaces configuration file and insert PSK settings.$ sudo nano /etc/network/interfacesComment out or delete WPA_ The supplicant setting is marked with. Add useful comments to record the intent of setting changes:#LOSE the wpa_ supplicant utility by commenting out these settings#allow-hotplug wlan0#iface wlan0 inet manual#wpa-roam /etc/wpa_ supplicant/wpa_ supplicant.conf#iface default inet dhcpConfigure WiFi settings using the PSK value generated in the last step:# BYPASSED wpa_ supplicant - Wifi configuration defined directly this file# Set the iface setting to use dhcpallow-hotplug wlan0iface wlan0 inet dhcpwpa-ssid MY_ SSID_ NO_ DOUBLE_ QUOTESwpa-psk 9d24321fad5e92de16581d4129g1b8dd2f47c6510953a68e95b1b6d99f5e95efSave and close the / etc / network / interfaces file.After saving the settings, the configuration file should be similar to the file in the image.Step 8: restart WiFi on PIUse ifdown to disconnect the network interface command: $ sudo ifdown wlan0 Internet Systems Consortium DHCP Client 4.2.2Copyright 2004-2011 Internet Systems Consortium.All rights reserved.Listening on LPF/wlan0/74:da:38:0f:9b:c8Sending on LPF/wlan0/74:da:38:0f:9b:c8Sending on Socket/fallback|DHCPRELEASE on wlan0 to 10.0.0.1 port 67Restart the network interface using the ifup command:Internet Systems Consortium DHCP Client 4.2.2Copyright 2004-2011 Internet Systems Consortium.All rights reserved.Listening on LPF/wlan0/74:da:38:0f:9b:c8Sending on LPF/wlan0/74:da:38:0f:9b:c8Sending on Socket/fallbackDHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4DHCPREQUEST on wlan0 to 255.255.255.255 port 67DHCPOFFER from 10.0.0.1DHCPACK from 10.0.0.1 bound to 10.0.0.15 -- renewal in 38873 seconds.Although the "operation not allowed" message is displayed in the output, PI can still access your router and connect to the network!Perform several simple ping operations. One hit the local router, the other hit something like google.com in the public domain.Press Ctrl C at any time to end the Ping test.Step 9: next stepsThe final confirmation is to open the browser on raspberry PI and surf the Internet.When working on my raspberry PI B board through the Internet, I can successfully copy this solution to the other two raspberry PI B boards!Now my PI board has returned to normal operation. The next step is to try to use the solution with wpa2-psk [AES] WiFi network. There are more lenses.
How Does QFN Package Solve the Heat Dissipation Problem of LED Display Screen
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Illustration of Replacing Laptop Screen
Illustration of Replacing Laptop Screen
Step 1: pull out the screwFirst turn the laptop over, and then remove the battery and the side of the laptop screen (remember to also open the screws hidden under the battery)Then, you will remove the keyboard screw that is usually located in the middle of the laptop (usually displays a keypad image) close to it to make your work easier)The last thing we have to do is disconnect the wire of the wireless antenna.On the HP dv9000 series, the wireless network card and memory are kept on the same plate, which gives us more space and makes us very easy.Find out which board hides your wireless card (it's harmless to open it all and view the contents below them in any way, because it's a learning experience)Once you find the network card and antenna wire with black, it winds out. Please note which wires go to which side of the card (I'm not sure of the importance of reconnecting them correctly, because they are only cut wires, and they won't close any circuits, but plug them back and attach things in the right way for the first time, ha ha)OK, now you can go to the top of the laptop.Step 2: remove the speaker frame and the annoying plastic cutting step.OK, so with the computer turned off and the battery removed from the device, press and hold the power button for 20 to 30 seconds to eliminate the remaining power. Capacitor, and then use a flat screwdriver to remove the speaker bezel from the device.Take your time, you won't break any plastic clips. We really want this unit to return together when it is finished.Step 3: screen screws and wiresOnce you remove the speaker bezel, you will see a (in my case) total of 6 wires protruding from the bottom of the screen into the laptop.From left to rightVideo cable, (cable for controlling all aspects of color and brightness such as LCD, backlight, etc.)The next step will be two thin lines that control the webcam on this displayOn the right side of the screen, you already have a wireless antenna cable and a webcam controller cable, and your replacement screen should already contain all of these.So just disconnect the laptop cable and connect it to the screen.If you don't care about these wires on the new screen, the screen may be wrong or the model may be small.You can consider taking the laptop screen apart and placing it horizontally (unfortunately, this may be troublesome, but it must be feasible).But go back to it, continue and pull out 2-3 or connect the 4 screws to the hinge of the laptop screen so that it can be gently lifted from the laptop.Now move the monitor away (but still tied to the laptop through the antenna cable)We can remove the keyboard, at the top of the keyboard, you will notice that the screws on the top of the 3 to 5 keyboards pull them forward and keep them apart(they will be different colors, so it's hard to keep them apart, but if you separate the screws in some way, it will make things easier), then gently lift the keyboard and pull it up (towards the screen), then tilt the keyboard so that you can see below it, and disconnect the cable connecting the keyboard to the laptop.Do not use this cable roughly. If you disconnect the keyboard cable when trying to fix the laptop screen, it will only cause problems and more money You may feel depressed in the whole room, = O ha ha, I don't want that.Step 4: serpentine antennaAfter unplugging the keyboard, the first thing to pay attention to is the of the wireless antenna(the only reason is to go so deep), so move on, release the wires from their small tracks and clips, and gently bend the end of the antenna into a line so that they can connect to the wireless network card at the bottom of the laptopRemember, if your wireless card has any unexpected twist or hook, how it will wind through, because you will need to reinsert the new antenna cable in one second.Step 5: throw it back.Once you release them, please continue and move your screen. It is broken and far away, but don't discard it in the future. The components on it may still be useful.Then grab your new monitor and start bending the wireless antenna lead back and locking it in place.Put the keyboard back in place and don't forget to reconnect the wires under the keyboard.Screw it back in place.(this is where we started to calculate the screws. We don't want to leave any screws. I hope you can remember their whereabouts well)Reconnect the video, microphone and camera wires to the laptop, and then screw the hinge of the laptop back to the laptop.Grasp the bezel of the laptop, fix it back in place, and then close the laptop,Turn it over and start replacing all the screws. Is there any left? Congratulations on winning!Slide the battery back into place (if not, connect the wireless antenna cable, just press it back into the slot). That's all. It's done. Open the suction cup again to see if you were cheated and bought another broken screen, or if you forgot to connect the wire correctly = P ha haIf it works properly, it means that you have successfully patted your back and waited for something. Otherwise, please break it so that you can regain new confidence and repair her = D
With the Rapid Development of Mobile Internet, the Production Qualification Rate of Display Screen I
With the Rapid Development of Mobile Internet, the Production Qualification Rate of Display Screen I
XXX backlight panel manufacturing factoryWith the rapid development of mobile Internet, the software and hardware technology of smart phones have been rapidly improved. At the same time, the price is also developing in the direction of more and more civilians, which makes the development of smart phones in China more and more diversified and the scope of application more and more comprehensive, and plays an extremely important role in people's intelligent life.Mobile phone display screen is an important part of smart phone. The production qualification rate of display screen and the production quality of mobile phone play a very important role in the popularization of mobile phone. Unqualified mark line will lead to product display problems. The traditional mark detection is an artificial naked eye detection method. There is a phenomenon that the detection change range is too large due to the instability of the artificial naked eye, which leads to the problems of inaccurate detection and low efficiency.At present, many types of work requiring precise calculation have been replaced by automation equipment, and the visual inspection of backlight is no exception. Follow the Xiaobian:What problems can be solved?It mainly detects the mark line of the mobile phone backlight, including:Number of mark lines (excessive and missing);Mark line length, accuracy plus or minus 0.1mm;The distance from the mark line to the specified frame, with an accuracy of plus or minus 0.1mm;Camera assemblyDetection processTest effectTake two stations as an exampleTest conclusionFrom the early sample test results, the software can accurately detect the edge of each sample and the mark line on the product, and accurately calculate the length of each mark line, the distance between each mark line and the edge and the number of mark lines. The specific indicators are as follows:(1) Detection accuracy: 0.1mm (compared with the actual product, it is related to the marking and filling method, appearance and measurement benchmark, and there will be corresponding fluctuations)(2) Detection efficiency: it varies according to the number of mark lines, 20 for each piece, and the detection time is within 0.5s;(3) Product model: support multiple models of the same material, with the maximum size of 80 * 160mm.(4) Mark line color: white and black. The detection parameters need to be adjusted.
How to Make My Computer Display the Screen Full Size?
How to Make My Computer Display the Screen Full Size?
adjust your screen resolution... if you had adjust it to high and still the same.. get a video card the has a highest resolution.1. ???...My laptop display screen needs cleaning...???there are products available at computer stores, but they mostly are composed of alcohol and other agents, you can safely use Windex and a soft clothes to wipe the screen depending if its glossy or matt, be careful to not scratch the surface with a hard or coarse clothe. spray on the cloth and then wipe, if there are sticky smudge then try to get more windex on it but becaureful you dont get any inside the screen bezel.2. Utility to display on screen the currently pressed keysQiPress seems to work for me.There is a lite and a pro version at $30. The lite version is enough for my needs3. Laptop display screen won't light up?the only way that i comprehend to tell for specific if it is the backlight or inverter is to plug a regular solid backlight into the inverter. If it lights then it is the backlight, if no longer it is the inverter. The inverter is a miles less costly, ordinary restoration or it is going to be besides. The backlight section is way less costly yet is complicated (study high priced) to interchange except you pick to aim it your self. It frequently is not the two4. Why do we call a computer or TV display a "screen?I discovered a very helpful passage from the book, The Oxford Handbook of Management Information Systems: Critical Perspectives and New Directions(link takes you to the passage)The author notes that the word "screen" originates from the 14th century, andevolved from the Middle English word serene, from the Middle French escren, and from the Middle Dutch scherm. It is a word akin to the Old High German (eighth century) words skirm, which meant shield, and skrank, which meant a barrier of some kind. The word screen also suggests another interesting signification, further away from us in history. It is a word 'probably akin' (MW) to the Sanskrit (1000 BC)" words carman, which meant 'skin', and kn'z'nti, which signifies 'he injures' (MW). These are possible meanings from which the Middle Age words evolved. The Sanskrit clue suggests that the notions of protection, shield, barrier, separation arose, possibly within the older Proto-Indo-European language, as metaphors of the concept of skin-possibly that of human (or animal) skin.So there is a lot to do with protection and barrier which run through the evolution of the word. The author goes on to describe the chronological relations between the words:A barrier or a protection is something raised over and against another something. This 'other' something faces the barrier, as the wind faces the windscreen of a car, which means that the screen protects against something, to be excluded, that moves towards it. That which is moving towards the screen could have been understood as a projection (from the Latin word projectare, which meant 'to throw forward') over a surface-just like the arrows and bullets were projected over the shields, or like the heat is projected onto the fireplace screen. The screen protects and shelters (just as a skin. . . ) because it receives and holds the projection of that which is not to be received 'inside' the cover that the screen provides. But what happens when something stopped by the screen is allowed to pass through? The answer is that it was screened. This means that it was permitted to pass through that barrier, or that it simply passed through it. The screen as a barrier is now understood as a 'system for detecting [for example] disease, ability, attribute' (OPDT 1997: 681-2). This interpretation links, or so we hope, the three central themes of meaning attached to the word screen: hiding/protecting, projecting/showing, and testing/selecting (ibid.).The author goes on to argue that these three themes all have a central intent - a demand for our attention. They provide this table to help show this. P.270I think that should pretty much answer the question. The author has other interesting things to say on the word as well, and explains the phenomenology of the word and relates it to concepts like "the truth in seeing". Interesting stuff!
Aventk UV Color Changing Black Glue 1098 Can Effectively Solve the Reflection Problem of OLED Displa
Aventk UV Color Changing Black Glue 1098 Can Effectively Solve the Reflection Problem of OLED Displa
Reflective problem of OLED display The core of OLED is a transparent organic semiconductor polymer, which can be made into a thin film and emit light by applying an electric field on both sides. Because the structure of OLED panel is very simple in theory, very thin products can be made. At present, the thickness of OLED display screen in mass production is only 0.95mm. Although OLED display is a self luminous product, after removing the backlight, there should be no problem of backlight leakage in theory. However, in terms of actual products, due to the existence of MF coating, there is still a problem of reflection around the edges of the display screen, as shown in the following figure:Therefore, how to solve the reflective problem of OLED display has become a concern of many manufacturers. In this regard, aventk has also studied and tested for many times, and finally determined that aventk 1098 series UV color changing black glue can solve this problem. Aventk UV color changing black glue 1098 can solve the problem. In solving the reflection problem of OLED display screen, most of them used UV black glue before. However, UV black glue needs to take into account UV light irradiation, so the blackness cannot be too deep, otherwise UV light cannot irradiate the cured glue. However, if UV glue black is not enough, it can not achieve good light blocking effect.To solve this problem, aventk 1098 series UV color changing black glue can be solved. Aventk UV color changing black glue contains aventk's exclusive NYX technology. NYX technology is aventk's unique UV light dyeing technology, which perfectly combines UV light with glue dyeing. It is a transparent color before UV curing and can well absorb UV light. After UV curing, it becomes black (or other colors). It not only meets the high efficiency of UV light curing, but also quickly completes the dyeing of glue. Put aventk UV color changing black glue is applied around the OLED display screen and between the screen and pol, which can greatly reduce the problem of reflection. fqj
LED Display Screen Enterprises to Enter the Field of 'price' -Information Industry News
LED Display Screen Enterprises to Enter the Field of 'price' -Information Industry News
Explore what your device can do and how to use it. Always On Display allows you to view the clock, battery and missed phone call/message notifications when the screen is turned off. The Always On Display screen uses less power and also utilizes the proximity sensor to turn off completely when in a purse or pocket. The user can change what appears on the Always On Display screen. Back up and sync your contacts, photos, videos, and more from your device. Bixby Vision gives you a deeper understanding of what you are looking at through your camera by identifying landmarks, translating languages, or showing you where to buy an item. Watch, search, and record your favorite movies and shows, and turn your device into your remote control, with the DIRECTV app on your phone. All of HBO together with new hits, classic favorites, plus new Max Originals. Hello Bixby allows you to quickly set reminders, create voice dictation, search and access content on your phone and on the internet. The Multi Window feature provides split-screen functionality, which allows you to use two applications at the same time. Complete multiple tasks on one screen, take notes while watching a video, or search the web and check your email messages simultaneously. View and pay your AT&T bills online, manage your account, reset passwords, or upgrade your AT&T services.Learn how to find your device and secure your info. Free apps typically get revenue through ads, pop-ups, or notifications. Learn how to manage these on your device. Find My Mobile allows you to manage your device in a secure way by tracking and controlling your device remotely. Secure your personal content and keep it hidden on your device. Lock or unlock your display, set a screen security lock type (pin, password, pattern, fingerprints, or iris and face recognition), get your PUK code, or request your device be unlocked from the ATnT network. Learn how to determine if you might have harmful software (malware) on your device and get tips to help fix the issue.Given current technology, could TV display screens double as video camera sensors?Yes, with interferometry based synthetic aperture imagery, but...It would take several orders of magnitude improvement in digital signal processing technology for it to work at the scale of a video screen. The sensors will need to record at a very high data rate, on the order of petahertz. Every single pixel will be receiving all of the light that is in its field of view, and none of the light will be focused. Fortunately, light is not just photons, it's also electromagnetic waves. The sensors will behave like antennas, rather than eyes, passively collecting the radio waves at the wavelength of visible light.Radio signal sources can be tracked quite easily, by measuring the timing of a wave reaching multiple antennas. The same applies to all sorts of waves; an earthquake's epicenter is calculated by measuring the timing when the waves arrive at seismometers. We even have the same types of sensors built into our own human bodies. : Our ears can taking a wave and determine the direction that it came from, based on changes of intensity and timing. We have already proven the concept using vast antenna arrays to collect unfocused photons, to create a focused image. We imaged the supermassive black hole M87* using the Event Horizon Telescope.Of course, when astronomers use the term "photon" they do not just mean visible light; they mean any coherent electromagnetic wave. This image represents the peak of current engineering feasibility for synthetic aperture imagery. The EHT uses a Very Long Baseline Interferometry, which works in 450 GHz, using very narrowly calibrated equipment designed specifically to tease out the glow of the accretion disk at the wavelengths to detect event horizons around black holes. In order to get meaningful data, though, your sample rate needs to be at least twice the frequency of the signal rate, preferably more than 4 times the signal rate, or you start getting downsampling errors called aliasing. In order to record visible light, which has frequencies between 405 THz to 790 THz, you will need a sample rate that is at least 1.58 PHz.Due to limitations from the speed of light, and the time that it takes electrons to pass through silicon and copper in computers, this is just past the fastest speed that we can record data meaningfully.We would have to pass the data from several sensors in order to build up a meaningful synthetic aperture image from interferometry. We would need specialized recording technology that we just do not have yet.And, there's also the problem that LEDs are not designed to collect light, even though they are capable of doing it. .. just as sound coming out of a microphone would sound terrible, and sound recorded from speakers is also low quality. It would take several generations of iterating on the current science in order to use an LED-based computer monitor to record what is happening it a room, and it will always require specialized systems to just record the data in a meaningful way, much less process it into an image. It took several petabytes of data and 3 years of processing in order to build the EHT's image of M87*. It was faster to hand-carry the hard drives from the telescopes around the world to the datacenter, than it would have been to send the data over high speed internet links. It would take a lot of iterative work to miniaturize the chips necessary to do the calculations, but the technology just barely exists.Such a screen would be prohibitively expensive, as it's much easier to just put a lense in front of a cluster of photodiodes (i. e. , a webcam) and hide that in the corner of the screen, but those leave physical evidence... you can see the lense if you take the screen apart. It could be possible, with non-digital interferometry, to construct such an image of the room in real time. .. but that equipment barely fits in the basements of large telescope observatories, and requires cryogenic cooling. You would not be able to collect it clandestinely, and would be much cheaper (and higher quality) to use a webcam.
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