Your Smart IOT

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<h1 class="headline"><span id="overview">Overview</span></h1>
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<p>One of the first things that you will want to do is to get your <a href="http://ift.tt/1o7SsLh" itemprop="url" target="_bank" title="Raspberry"><strong>Raspberry</strong></a> Pi connected up to the Internet.</p>
<p>In this lesson, you will learn how to:</p>
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<li>Connect using an Ethernet cable</li>
<li>Use a WiFi adapter with both <a href="http://ift.tt/1UhpgQn" itemprop="url" target="_bank" title="Raspbian"><strong>Raspbian</strong></a> and Occidentalis</li>
<li>Find out the IP address of your Raspberry Pi</li>
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<h1 class="headline"><span id="using-a-wired-network">Using a Wired Network</span></h1>
<div class="author">The quickest way to get your Raspberry Pi connected is to use an Ethernet patch cable and just plug it into the back of your home network router.</div>
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<p>As soon as you plug your Pi in, you should see the network LEDs start to flicker.</p>
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<p>For most home networks, you should also be able to connect to the Internet without any further configuration. For this to work, your router should be configured for DHCP (Dynamic Host Configuration Protocol). This service runs on your home network router, dishing out IP addresses to any device that connects to it either through WiFi or by cable.</p>
<p>If DHCP is not turned on, on your home network router, then connect to its management console using a different computer that is already connected.</p>
<p>You should be able to find a setting somewhere that turns it on.</p>
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<h1 class="headline"><span id="buying-a-usb-wifi-adapter">Buying a USB WiFi Adapter</span></h1>
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<p>Look for a WiFi adapter that supports the RTL8192cu chipset, as both the latest Raspbian and Occidentalis distributions both have support for this built-in and we’ve found its much faster than the Ralink chipsets</p>
<p>If you already have a WiFi adapter, just give it a go, even a lot of the very low cost budget adapters will work without any trouble.</p>
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<p>WiFi does however use quite a lot of power, so check the power rating of your power supply. Some WiFi adapters require an external power supply to work well. <a href="http://ift.tt/1w0wtpf" target="_blank" title="Link: http://ift.tt/1w0wtpf">We suggest the 5V 1A power adapter in our shop if this is the case</a>. All of the WiFi adapters we have in the Adafruit shop will work just fine this way.</p>
<p>If you have a WiFi adapter plugged in, then you no longer have two free USB sockets available for your <a href="http://ift.tt/1UQBgqN" itemprop="url" target="_bank" title="keyboard"><strong>keyboard</strong></a> and mouse, <a href="http://ift.tt/O2ZsXL" target="_blank" title="Link: http://ift.tt/O2ZsXL">so you may also need a powered USB hub.</a></p>
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<h1 class="headline"><span id="setting-up-wifi-with-raspbian">Setting up Wifi with the Graphic Interface</span></h1>
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<div class="alert">Setting up WiFi requires that your router is broadcasting the SSID. Make sure you have “Broadcast SSID” set up on your router! This will not work with “private” SSID setups</div>
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<p>Raspbian releases after 2012-10-28 include a WiFi configuration utility. You will find the shortcut for this on the Desktop. If you are using command-line tools or are logging in over Ethernet, check the next page for how to edit <b>/etc/network/interfaces</b> by hand</p>
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<p><b>Step 1.</b></p>
<p>Double-click the icon and this is what you will see.</p>
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<p><b>Step 2.</b></p>
<p>Click on the Scan button and a second window will open. Find your Wireless access point in the list and double click on it. This will open another window.</p>
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<p><b>Step 3.</b></p>
<p>Enter your password in the PSK field and then click Add. When you look at the first window, you should see that the connection is all set up for use. You can connect or disconnect using the buttons. Notice also the IP address of the Pi is shown at the bottom of the window.</p>
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<h1 class="headline"><span id="setting-up-wifi-with-occidentalis">Setting up Wifi with the Command Line</span></h1>
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<div class="alert">This tutorial works best if your router is broadcasting the SSID. Make sure you have “Broadcast SSID” set up on your router! This may not work with “private” SSID setups</div>
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<p>Setting up WiFi in Occidentalis, is also pretty straight forward. You just need to add the name of your wireless network (its SSID) and your password to a configuration file.</p>
<p><b>Step 1.</b></p>
<p>Boot the Raspberry Pi without the WiFi adapter plugged in.</p>
<p><b>Step 2.</b></p>
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<p>Open a Terminal session by clicking on the LXTerminal icon, and enter the following command into it:</p>
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<li class="L0"><span class="pln">sudo nano</span> <span class="pun">/</span><span class="pln">etc</span><span class="pun">/</span><span class="pln">network</span><span class="pun">/</span><span class="pln">interfaces</span></li>
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<li class="L0"><span class="kwd">auto</span> <span class="pln">lo</span></li>
<li class="L1"><span class="pln"> </span></li>
<li class="L2"><span class="pln">iface lo inet loopback</span></li>
<li class="L3"><span class="pln">iface eth0 inet dhcp</span></li>
<li class="L4"><span class="pln"> </span></li>
<li class="L5"><span class="pln">allow</span><span class="pun">–</span><span class="pln">hotplug wlan0</span></li>
<li class="L6"><span class="kwd">auto</span> <span class="pln">wlan0</span></li>
<li class="L7"><span class="pln"> </span></li>
<li class="L8"><span class="pln"> </span></li>
<li class="L9"><span class="pln">iface wlan0 inet dhcp</span></li>
<li class="L0"><span class="pln">wpa</span><span class="pun">–</span><span class="pln">ssid</span> <span class="str">“ssid”</span></li>
<li class="L1"><span class="pln">wpa</span><span class="pun">–</span><span class="pln">psk</span> <span class="str">“password”</span></li>
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<div class="row-fluid build-text">If you are using a ‘hidden’ SSID, try the following (hat-tip to<a href="http://ift.tt/1nRLYLu" target="_blank">http://ift.tt/1nRLYLu</a>)</div>
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<div class="code-copy-container"><a class="code-copy-button" href="http://ift.tt/1ikwilZ" target="_blank">Copy Code</a></div>
<ol class="linenums">
<li class="L0"><span class="kwd">auto</span> <span class="pln">lo</span></li>
<li class="L1"><span class="pln"> </span></li>
<li class="L2"><span class="pln">iface lo inet loopback</span></li>
<li class="L3"><span class="pln">iface eth0 inet dhcp</span></li>
<li class="L4"><span class="pln"> </span></li>
<li class="L5"><span class="kwd">auto</span> <span class="pln">wlan0</span></li>
<li class="L6"><span class="pln">allow</span><span class="pun">–</span><span class="pln">hotplug wlan0</span></li>
<li class="L7"><span class="pln">iface wlan0 inet dhcp</span></li>
<li class="L8"><span class="pln">wpa</span><span class="pun">–</span><span class="pln">scan</span><span class="pun">–</span><span class="pln">ssid</span> <span class="lit">1</span></li>
<li class="L9"><span class="pln">wpa</span><span class="pun">–</span><span class="pln">ap</span><span class="pun">–</span><span class="pln">scan</span> <span class="lit">1</span></li>
<li class="L0"><span class="pln">wpa</span><span class="pun">–</span><span class="pln">key</span><span class="pun">–</span><span class="pln">mgmt WPA</span><span class="pun">–</span><span class="pln">PSK</span></li>
<li class="L1"><span class="pln">wpa</span><span class="pun">–</span><span class="pln">proto RSN WPA</span></li>
<li class="L2"><span class="pln">wpa</span><span class="pun">–</span><span class="pln">pairwise CCMP TKIP</span></li>
<li class="L3"><span class="pln">wpa</span><span class="pun">–</span><span class="kwd">group</span> <span class="pln">CCMP TKIP</span></li>
<li class="L4"><span class="pln">wpa</span><span class="pun">–</span><span class="pln">ssid</span> <span class="str">“My Secret SSID”</span></li>
<li class="L5"><span class="pln">wpa</span><span class="pun">–</span><span class="pln">psk</span> <span class="str">“My SSID PSK”</span></li>
<li class="L6"><span class="pln"> </span></li>
<li class="L7"><span class="pln">iface</span> <span class="kwd">default</span> <span class="pln">inet dhcp</span></li>
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<p><b>Step 3.</b></p>
<p>This opens an editor screen of the wifi configuration file you need to change.</p>
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<p>The two places where you need to make a change are on the last two lines. Change the file so that it looks like this:</p>
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<p>Of course, you should put in <b>your</b> network and password! Note that you need to keep the double-quote characters around your wireless network name and password.</p>
<p>This kind of editor does not let you use the mouse. Instead, use the cursor keys to move around the file.</p>
<p><b>Step 4.</b></p>
<p>When you have finished press [ctrl]x. This will ask if you want to save the modified files.</p>
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<p>Press ‘Y’ and then Return to save the file with the same name.</p>
<p><b>Step 5.</b></p>
<p>Shut down your Raspberry Pi, plug the WiFi adapter in and start it up again. You should find that the Raspberry Pi connects using the WiFi adapter as it boots up.</p>
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<h1 class="headline"><span id="finding-your-pis-ip-address">Finding Your Pi’s IP Address</span></h1>
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<p>You can find the IP address of your computer, either by opening the WiFi setup tool again. The IP address will appear at the bottom of the Window.</p>
<p>If you are using Occidentals, or you want to do this over a command line terminal. Open up a LXTerminal window and type the following command:</p>
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<li class="L0"><span class="pln">sudo ifconfig</span></li>
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<p>Next to the <b>wlan0</b> entry you will see inet addr: <b>192.168.1.10</b> which is the IP address of the Raspberry Pi.</p>
<p>Remember! If your IP address starts with <b>192.168</b> or <b>10.0</b> then its an internal address – that means you can get OUT to the Internet but you cannot have someone outside your home or network reach your Pi via the IP address. This is important if you want to have a webserver running on a Pi that outside people can reach. In general, its much safer to keep your Pi on an internal network so it can’t be hacked as easily!</p>
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<h1 class="headline"><span id="test-and-configure">Test and Configure</span></h1>
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<p>If you have X running, open the Midori web browser and navigate to the URL of your favourite electronics supplier.</p>
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<div class="row-fluid build-text">If you are using a command line, the <b>ping</b> command can be used to see if you are reaching the internet. Try <b>ping google.com</b> or<b>ping adafruit.com</b> to check if you can reach those sites!</div>
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<h1><span id="fixing-wifi-dropout-issues" class="anchor-link-target"></span>Fixing WiFI Dropout Issues</h1>
<p>If you find your module ‘drops out’ from time to time, you can fix it fairly easily with a command line fix <i>(</i><a href="http://ift.tt/1f78v8s" target="_blank"><i>thanks perseus286</i></a><i>!)</i></p>
<p>Create and edit a new file in /etc/modprobe.d/8192cu.conf</p>
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<p><b><span class="editor-monospace">sudo nano /etc/modprobe.d/8192cu.conf</span></b></p>
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<p>and paste the following in</p>
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<p><span class="editor-monospace"># Disable power saving</span><br />
<span class="editor-monospace">options 8192cu rtw_power_mgnt=0</span> rtw_enusbss=1 rtw_ips_mode=1</p>
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<p>Then reboot with <b>sudo reboot</b></p>
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Adafruit’s Raspberry Pi Lesson 3. Network Setup

Overview One of the first things that you will want to do is to get your Raspberry Pi connected up to the Internet. In this lesson, y...

Adafruit’s Raspberry Pi Lesson 3. Network Setup

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