• Comments Show: How To Make A Basic Email Server


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    What if my port 25 is blocked? Is the Email server safe? What if my IP address changes? In this video I’ll answer these comments and more from my latest tutorial: How to Make A Basic Email Server

    [highlight] How to Make A Basic Email Server [/highlight]

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  • Make Your Own Cluster Computer (Part 2)

    [vc_row][vc_column width=”2/3″][vc_separator][venera_framed_image content_type=”video” css_animation=”appear” frame_type=”browser” slider_engine=”flexslider” video_link=”https://www.youtube.com/watch?v=lHmFRlETTcQ” browser_url=”https://www.youtube.com/watch?v=lHmFRlETTcQ”][vc_separator][/vc_column][vc_column width=”1/3″][/vc_column][/vc_row][vc_row][vc_column width=”2/3″][vc_tabs][vc_tab title=”About This Project” tab_id=”1402713028-1-39e9a4-2f88″][vc_column_text]

    65_cluster_comp2_thThis is part two of the series that shows you how to make a cluster computer using Raspberry Pi’s!

    You can watch Part 1 here.

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    Acquiring the Parts
    Here’s what you will need:

    1. 2 or more Raspberry Pi’s
    2. SD cards for each Pi
    3. Power Cables for each Pi
    4. Powered USB Hub (optional)
    5. Networking Cables
    6. A Hub or a Router

    TOTAL COST: ~$100.00

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    Installing and Configuring Raspbian

    • Follow the software configuration steps shown in this video and burn the image file to an SD card for each computer in your cluster.
    • For each Raspberry Pi in your cluster, insert an imaged SD card, connect them all to the same router or switch, and then connect a power source to each one.

    [tabby title=”Terminal Commands”]

      • Install nmap
        • Sudo apt-get update
        • Sudo apt-get install nmap
      • Get current IP
        • Ifconfig
      • Scan subnet for Pi’s
        • Sudo nmap -sn 192.168.1.*
      • Run test file
        • Mpiexec -n 1 hostname
      • Make test folder and file
        • Mkdir mpi_test
        • Cd mpi_test
        • Nano machinefile
        • Mpiexec -f machinefile -n 4 hostname
      • Add keys to all pi’s
        • PI01
          • Ssh-keygen
          • Cd ~
          • Cd .ssh
          • Cp id_rsa.pub pi01
          • Ssh pi@
        • PI02
          • Ssh-keygen
          • Cd .ssh
          • Cp id_rsa.pub pi02
          • Scp .
          • Cat pi01 >> authorized_keys
          • Exit
        • PI03 (ssh pi@
          • Ssh-keygen
          • Cd .ssh
          • Cp id_rsa.pub pi03
          • Scp .
          • Cat pi01 >> authorized_keys
          • Exit
        • PI04
          • Ssh-keygen
          • Cd .ssh
          • Cp id_rsa.pub pi04
          • Scp .
          • Cat pi01 >> authorized_keys
          • Exit
        • PI01
          • Scp
          • Cat pi02 >> authorized_keys
      • Run new machinefile
        • Cd ~
        • Nano machinefile
        • Mpiexec -f machinefile -n 4 hostname
      • Run Python file
        • mpiexec -n 5 python demo/helloworld.py
        • Mpiexec -f machinefile -n 5 python /home/pi/build/mpi4py/demo/md5_dict_attack.py
      • Download and unzip file
      • Copy to all computers
        • Scp -r python_test
        • Mpiexec -f machinefile -n 5 python python_test/md5_attack.py

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  • Make Your Own Cluster Computer

    [vc_row][vc_column width=”2/3″][vc_separator][venera_framed_image content_type=”video” css_animation=”appear” frame_type=”browser” slider_engine=”flexslider” video_link=”https://www.youtube.com/watch?v=1R0UgIgcb5g” browser_url=”https://www.youtube.com/watch?v=1R0UgIgcb5g”][vc_separator][/vc_column][vc_column width=”1/3″][/vc_column][/vc_row][vc_row][vc_column width=”2/3″][vc_tabs][vc_tab title=”About This Project” tab_id=”1402713028-1-39e9a4-2f886e2a-7d43″][vc_column_text]

    Learn how to make a cluster computer using Raspberry Pi’s! You can also use this method to build your own super computer.

    [/vc_column_text][/vc_tab][vc_tab title=”Parts and Downloads” tab_id=”1402713028-2-39e9a4-2f886e2a-7d43″][vc_column_text]

    Acquiring the Parts
    Here’s what you will need:

    1. 2 or more Raspberry Pi’s
    2. SD cards for each Pi
    3. Power Cables for each Pi
    4. Powered USB Hub (optional)
    5. Networking Cables
    6. A Hub or a Router

    TOTAL COST: ~$100.00 [tabby title=”Software”]

    [/vc_column_text][/vc_tab][vc_tab title=”Code” tab_id=”1402753910272-3-86e2a-7d43″][vc_column_text]

    Installing and Configuring Raspbian

    • Download the Raspbian Image from here.
    • Burn the Raspbian Image to your SD Card
    • Once the image is burned to your SD Card, but it into the Raspberry Pi and boot it up with a Keyboard, Mouse, Monitor and Internet attached.
    • Upon first boot, you should see the Rasbperry Pi Configuration screen (otherwise type “sudo raspbi-config“. Here’s the options we’ll need to configure
        • Expand the File System
        • If needed, set the Internationalization options to match your countries keyboard layout.
        • Overlcock the Pi to 800 Mhz
        • Advanced Options
          • Set the Hostname to Pi01
          • Split the memory to 16mb for graphics
          • Enable SSH
        • Finish out of the configuration, but don’t reboot yet
        • To enable auto-login, at the terminal command type “sudo nano /etc/inittab
          • Comment out this line: #1:2345:respawn:/sbin/getty --noclear 38400 tty1
          • And add this line right beneath it: 1:2345:respawn:/bin/login -f pi tty1 </dev/tty1 >/dev/tty1 2>&1
        • Now you can reboot your Pi and it should auto-login

    [tabby title=”Terminal Commands”]

    Installing MPICH

    • MPICH is software that allows for multi-processing communication between computers.
    • To install it on your Raspberry Pi, first make sure you have a valid Internet connection going to the Pi. Then follow these Terminal Commands
      • sudo apt-get update
      • mkdir mpich2
      • cd ~/mpich2
      • wget http://www.mpich.org/static/downloads/3.1/mpich-3.1.tar.gz
      • tar xfz mpich-3.1.tar.gz
      • sudo mkdir /home/rpimpi/
      • sudo mkdir /home/rpimpi/mpi-install
      • mkdir /home/pi/mpi-build
      • cd /home/pi/mpi-build
      • sudo apt-get install gfortran
      • sudo /home/pi/mpich2/mpich-3.1/configure -prefix=/home/rpimpi/mpi-install
      • sudo make
      • sudo make install
      • nano .bashrc
        • PATH=$PATH:/home/rpimpi/mpi-install/bin
      • sudo reboot
      • mpiexec -n 1 hostname
    • These commands will download and install MPICH, as well as add it as a path to your BASHRC boot file. The last command runs a test to see if it works. If the last command returns “Pi01”, then you did everything successfully.

    Installing MPI4PY

    • As it is, MPICH can run C and Fortran programs. But since the Raspberry Pi has the Python coding environment pre-installed, it would be easiest to install a Python to MPI interpreter. Here’s the commands to do that:

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  • Cheap Ways To Stream Youtube To Your TV

    Here are some cheap alternatives to stream to your TV from your computer, Android devices, or iOS devices.

    Chromecast Basics:

    Use your Android or iOS device as a Chromecast:

    Turn a Raspberry Pi into a Media center:

  • How To Make A Raspberry Pi Bitcoin Mining Rig

    Learn how to make a Raspberry Pi Bitcoin Mining Rig.

    330Mh/z GPU – http://goo.gl/QlGVM7
    Powered USB Hub – http://goo.gl/nvPzEy
    Raspberry Pi – http://goo.gl/h0u9qA

    MinePeon – http://minepeon.com/
    Bitcoin Wallet – https://coinbase.com/
    Mining Pool – http://mining.bitcoin.cz/

  • Hacking Minecraft Pi Edition

    Minecraft is now available for the Raspberry Pi. Not only that, but it’s a hackable version that allows you to write scripts for the game using python.


    Martin O’Hanlin’s blog – http://www.stuffaboutcode.com

    Minecraft Python Block List – http://goo.gl/raZkd


    Raspberry pi beginners guide – http://goo.gl/PVZWa

    Raspberry Pi Playlist  – http://goo.gl/OkNQU

  • DIY Arcade Cabinet Using A Raspberry Pi

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    The $35 Raspberry Pi has proven to be a hit amongst hardware hackers and DIYers. It’s very small, easy to set up, and very versatile. This tutorial walks you through the steps of creating and setting up an Arcade cabinet using a Raspberry Pi as the core.


    [/vc_column_text][/vc_tab][vc_tab title=”Parts and Downloads” tab_id=”1402713028-2-39e9a4-2f888a6d-d37d76d3-94ce”][vc_column_text]

    Parts List

    The prices really depend on what you would like to purchase. Depending on what you already have available, it’s possible that you may not have to spend over $50.

    Raspberry Pi Arcade

    Part name Price
    Raspberry Pi $35
    Wifi Adapter $17
    Ethernet Cable $3
    SD Card $6
    Powered USB Hub $4
    USB Mouse $6
    USB Keyboard $5
    Monitor (may also need an adapter) $120
    USB Joystick and Buttons (optional) $27
    Arcade Cabinet Kit (optional) $200-$500

    [/vc_column_text][/vc_tab][vc_tab title=”Assembly” tab_id=”1402753910272-3-88a6d-d37d76d3-94ce”][vc_column_text]

    Raspberry Pi Setup

    Installing the Operating System

    There are several different options when it comes to emulators on the Raspberry Pi, but in order to make the Pi function as an Arcade, one stands out amongst the rest. It’s an opensource program called AdvMame and what makes it unique is that it can be used in conjunction AdvMenu to automatically boot to your game directory. The only issue is that it requires a lot of editing and tweaks to get everything to work. Luckily the folks at blog.sheasilverman.com have compiled a version of AdvMame with all the tweaks and edits so that it works specifically for the Pi. It’s called PiMame and can be downloaded and burned to an SD card.



    To install PiMame on an SD card in Windows, you need to download an image burner such as Win32 Disk Imager. After you have PiMame downloaded, you should be able to extract it to view the PiMame.img file. Launch Win32 Disk Imager and under “Image File”, select the PiMame image. For “Device”, select the drive letter for your SD card. Then click “write” to burn the image to the SD card.



    For Mac computers you do not need any extra software. Just download the PiMame zip file and extract it. Insert your SD card and open up a terminal prompt. Type in

    df -h

    Record all of the “disk” entries that are listed (ex. disks1). Go into your Disk Utility settings and find your SD card and unmount it (not eject). Then go back to your terminal prompt and type df -h again to see which disk is no longer there. The missing one is the disk ID of your SD card. With that in mind, type in this command

    sudo dd bs=1m if=~/PATH TO PIMAME/pimame-0.5.img of=/dev/DISK#

    where PATH TO PIMAME is the path to where you downloaded the PiMame image and where disk# is set to your SD cards disk number (ex. disks1 = disk1). Executing this command will burn the image to your SD card. When it’s done, you can type

    sudo diskutil eject /dev/DISK#

    This will eject your SD card.

    First Run

    Gridlee game splash screen

    Once PiMame is installed on your SD card, it’s time to boot up your Raspberry Pi. Make sure that you have a monitor plugged into it as well as the powered USB hub with your USB wireless card, keyboard, and mouse plugged into it. As a pro tip, you can also plug the Raspberry Pi itself into the USB hub since the hub can provide enough juice to power the Pi. The only reason you would need the network cable is in the event that the wireless adapter doesn’t work and you need to download updates in order to get it working.

    With the SD card in the Raspberry Pi, turn it on and you should see it boot to the AdvMenu where you will see a game called Gridlee already installed. You can use your keyboard’s number pad and enter key to select the game and play it.

    Setting up wireless

    The most optimal way for the Arcade cabinet to connect through the internet would be through wireless. But in order to tweak the AdvMame and AdvMenu setup, we need to first get to the command line console. If you are in a game, you can hit Esc on your keyboard and select Exit. This will take you back to the game menu. Then hit Esc again to exit the menu and bring up the command prompt. The newest version of PiMame includes Raspbian, which provides a Graphical User Interface (GUI) that has an easy to use wireless program.

    Raspbian Wireless Interface

    Making sure that your USB Wifi card is plugged in, type this in to access the Raspbian GUI:


    This will launch the user interface in which the mouse will be enabled and can be used. Double click on the Wifi Config icon, which should be on the desktop. This will launch an interface. Click on the Manage Networks tab and select the Enabled radio button to enable wireless. Then you should be able to click scan to scan your area for wireless networks. Find your wireless network, double-click on it and enter in your wireless password. When you have successfully connected, you can logout of the Raspbian GUI session. At this point you can unplug your network cable and your mouse as they will no longer be needed.

    Connecting via SSH

    With the wifi enabled, the easiest way to work with the Pi is through SSH, which is essentially a way to remote connect to the Pi and run commands on it. Connecting via SSH requires finding the IP address of your Pi. The easiest way to do this is by typing


    This brings up your internet connection settings with eth0 being your ethernet connection and wlan0 being your wireless connection. Immediately under your wlan0 connection, you should see the IP address assigned to it (ex. Once you have your IP address, you can connect via SSH.

    Tweaking The Software

    Adding Joystick Input

    If you would like to be able to use joysticks and buttons with your arcade machine, then you will first need to purchase USB enabled joysticks and buttons. Depending on what you get and where you purchase them, the price can range from $25 to hundreds of dollars. When using them, make sure that you have them plugged directly into the powered USB hub, as joysticks sometimes require more power than the Pi alone can provide.

    Once you have the joysticks and buttons hooked up and plugged in, we need to enable them within the software, because AdvMame has it turned off by default. So make sure you are at a command prompt and type

    sudo nano .advance/advmenu.rc

    This will open up the AdvMenu settings as an editable file. Within this file, you want to find the line that says:

    device_joystick none

    and edit it so that is says

    device_joystick auto

    Now hit Ctrl X on your keyboard and it will ask you if you want to overwrite the file, hit y for yes and then hit enter to save. You should now be back at the command prompt. At this point, you could restart your Pi by typing:

    sudo reboot

    It will reboot back into the game menu where you can start the game and see if the joystick functionality works.

    Arcade Cabinet Setup


    When it comes to monitors, just about any will do as long as you have the right adapter. Here you can find an HDMI to VGA and a HDMI to DVI adapter. Those two adapters should account for most monitor connections (including older CRT monitors). The main thing that you need to take into account is the size of the monitor and how it will fit into your arcade cabinet.


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    Help support my channel:

    1. Donate To My Patreon
    2. Follw Me On Google +
    3. Like Me On Facebook
    4. Follow Me On Twitter

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  • How To Make Smartphone Controlled Christmas Lights


    Learn how to make Android or iPhone controlled Christmas lights (or other electronic objects) using a raspberry pi.


    Music Synchronized Christmas Lights – https://www.youtube.com/watch?v=KrRczbPg9yg

    USB Christmas Lights – https://www.youtube.com/watch?v=Q6NtqO1vou4

    Raspberry Pi tutorial – http://www.youtube.com/watch?v=WgcNBjIJNYs

    Download Rasbian – http://www.raspberrypi.org/downloads

    Download WebIOPi – http://code.google.com/p/webiopi/

    SSR Details – http://goo.gl/x74u3

  • Make A Media Center For Less Than $40

    Learn how to make a Media Server using a $35 raspberry pi device and XBMC.