The Raspberry Pi is a low cost single-board computer which has recently become very popular. The Raspberry Pi is controlled by a modified version of Debian Linux optimized for the ARM architecture. Wi-Fi-based Wireless Sensor Network (WSN) has the features of high bandwidth and rate, non-linetransmission ability, large-scale data collection and high cost-effective, and it has the capability of high data rate, which cannot be realized with Zigbee/Bluetooth. The research on Wi-Fi-based WSN and its application has high practical significance to the development of the Internet of Things. In this paper we are interfacing Wi-Fi module to Raspberry Pi development board to transmit the shopping malls ads, so that the users can get the latest information about discounts, new offers in there Smart Phone through internet. This project concentrates on shopping mall ads data exchange. As this project is cost effective, each and every small individual shop can have this module and update their latest offers and deals. We input latest ads using a simple html web page.
The Raspberry Pi is a tiny computer designed in the United Kingdom and sold around the world at a very low price. The Pi ships as a bare circuit board with standard connections for a keyboard, mouse, monitor, and power supply. You must add these extras yourself. To keep costs down, the Pi uses an SD card, a small memory card, as a hard drive. The Pi also includes extra connections you can use in your own electronic projects, and two software applications, Python and Scratch, for learning programming. The Pi is much less powerful than a PC or Mac. You cannot run Microsoft Office on it. However, you can use it as a small media center and for programming games. You can also create network based projects such as a web server, file server, or even a home automation system.
Required SD Card
We recommend an 8GB class 4 SD card – ideally preinstalled with NOOBS. You can buy a card with NOOBS pre-installed, or you can download it for free from our downloads page.
2.1 Display And Connectivity Cables
Any HDMI/DVI monitor or TV should work as a display for the Pi. For best results, use one with HDMI input, but other connections are available for older devices. Use a standard Ethernet cable for internet access.
2.2 Keyboard And Mouse
Any standard USB keyboard and mouse will work with your Raspberry Pi. 2.3 Power supply Use a 5V micro USB power supply to power your Raspberry Pi. Be careful that whatever power supply you use outputs at least 5V; insufficient power will cause your Pi to behave in strange ways. 2.4 Not Essential but Helpful to Have Internet connection To update or download software, we recommend that you connect your Raspberry Pi to the internet either via and ethernet cable or a wifi adapter. 2.5 Headphones Headphones or earphones with a 3.5mm jack will work with your Raspberry Pi. 2.6 Plugging In Your Raspberry Pi Before you plug anything into your Raspberry Pi, make sure that you have all the equipment listed above to hand.
Then Follow These Instructions:
· Begin by slotting your SD card into the SD card slot on the Raspberry Pi, which will only fit one way.
· Next, plug in your USB keyboard and Mouse into the USB slots on the Raspberry Pi.
· Make sure that your monitor or TV is turned on, and that you have selected the right input (e.g. HDMI 1, DVI, etc)
· Then connect your HDMI cable from your Raspberry Pi to your monitor or TV.
· If you intend to connect your Raspberry Pi to the internet, plug in an ethernet cable into the ethernet port next to the USB ports, otherwise skip this step.
· When you are happy that you have plugged in all the cables and SD card required, finally plug in the micro usb power supply. This action will turn on and boot your Raspberry Pi.
· If this is the first time your Raspberry Pi and NOOBS SD card have been used, then you will have to select an operating system and configure it.Follow the NOOBS guide to do this.
2.7 Logging Into Your Raspberry Pi Once your Raspberry Pi has completed the boot process, a login prompt will appear. The default login for Raspbian is username pi with the password raspberry. Note you will not see any writing appear when you type the password. This is a security feature in Linux. After you have successfully logged in, you will see the command line prompt pi@raspberrypi~$
To load the graphical user interface, type start x and press Enter on your keyboard. 2.8 Preparing your SD card for the Raspberry Pi. In order to use your Raspberry Pi, you will need to install an Operating System (OS) onto an SD card. An Operating System is the set of basic programs and utilities that allow your computer to run; example include Windows on a PC or OSX on a Mac. These instructions will guide you through installing a recovery program on your SD card that will allow you to easily install different OS’s and to recover your card if you break it. 1. Insert an SD card that is 4GB or greater in size into your computer 2. Format the SD card so that the Pi can read it.
Wi-Fi is one of the most popular wireless communication standards on the market. Wi-Fi is technically a trademarked brand name for the wireless standard owned by the Wi-Fi Alliance, much like Bluetooth is trademarked by the Bluetooth Special Interest Group. In its fledgling stages, Wi-Fi technology was almost solely used to wirelessly connect laptop computers to the Internet via local area networks (LANs), but thanks to the immense flexibility the technology provides, that’s no longer the case. Wi-Fi technology is now found in a host of non-computer electronic devices as well, such as home theater receivers, video game consoles, Blu-ray players, digital cameras, and even GPS devices. The official name for the specification is IEEE 802.11, and it is comprised of more than 20 different standards, each of which is denoted by a letter appended to the end of the name. The most familiar standards are 802.11b and 802.11g (Wireless B and G) which are used in the majority of commercial Wi-Fi devices. Both of these standards operate in the 2.4 GHz band, and the only major difference between the two is the transfer rate. Some consumer electronics, however, use a different standard Wireless A. The devices operate within the 5 GHz range and have transfer rates equivalent to 802.11g. However, since they operate on different frequencies, devices using the 802.11a standard cannot communicate with B and G-enabled devices. The newest standard, dubbed 802.11n was designed to replace all three of the previous standards. It’s up to five times fasterthan 802.11g, with a range almost twice as far. It also adds multiple-input multiple-output (MIMO) technology, which uses multiple antennas to increase data transfer rates. The 802.11n standard was drafted to allow up to four channel configurations with potential speeds up to 600 Mb/sec. It’s becoming increasingly popular for its high speeds, which allow for smoother audio and video streaming among devices.
3.1 Advantages of Wi-Fi
Now that we’ve covered the basics of the technology, let’s check out some of the advantages Wi-Fi has over its wireless (and wired) competition. Unparalleled mobility and flexibility ever installed a multi-room stereo and had to run wires through a wall, you know the amount of time and effort it requires, not to mention the permanence of your installation. If it want to move the receiver to another room, the wiring has to be completely redone, and the holes patched. Fast data transfer rates with transfer speeds around 150 megabits (Mb) per second (18.75 megabytes), 802.11n is currently the fastest commercially available Wi-Fi protocol on the market. It’s more than capable of handling the demands of streaming highdefinition TV signals, as well as CD-quality audio.
In this Raspberry pi SD card incerted then user id and password will changes regarding wi-fi in different places.WiFi dongler connected to the raspberry pi and power supply also given to the this board.Wi-Fi dongler is blinckerd it used to say receiving the wi-fi signal then web page is opend after the userid and password the application will be running.