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====== Add a Network Interface without using USB ======
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The Pi Zero has the limitation of only having a single USB port. If you want to put your Pi Zero on the LAN, then you need to add a network port, this is normally done using a USB Nic. 
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I hate buying anything for the Pi Zero that costs proportionally more than the Pi Zero, and USB network adapters fall in to that category. Pay a few quid for one, and you only get a crappy unreliable Nic that is sold as USB2, but is normally an old USB 1.x and that fails all the time, believe me, I have tried a lot of them.
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Then I came across this website [[http://raspi.tv/2015/ethernet-on-pi-zero-how-to-put-an-ethernet-port-on-your-pi]]
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What they have done is used a network module that runs on the SPI bus. Its a cheap unit that you can get from ebay for around £3, and while they are cheap, they are reliable, albeit a little slow, but not so slow that they are unusable. I will take reliability over speed any day.
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Here is the unit I purchased from eBay for £2.07p\\ 
{{:s-l1600.jpg?300|}}
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The seller on eBay is <color Orange>chips-fans</color> and while it has the same part number as the one used on raspi.tv, the pins are different, which is a bit annoying, but it wasn't to hard to work out.
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===== Connecting the NIC ======
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Here are the connections I used for this board:
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    GPIO     RPi Pin    Nic PNo    Nic Func
    
    n/c                 1          CLK
    n/c                 2          WOL
    GPIO10   19         3          SI
    GPIO08   24         4          CS
    3v3      17         5          Vcc
    GPIO25   22         6          NT
    GPIO09   21         7          SO
    GPIO11   23         8          SCK
    n/c                 9          RST
    GND      20         10         GND
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===== Configuration =====
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Enable the SPI Pins:
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    From the command line
    
    sudo raspi-config
    
    Advanced Options - SPI - Yes to Enable
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Add the following to your <color Orange>/boot/config.txt</color>
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    dtoverlay=enc28j60
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Now <color red>reboot</color> the Pi
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===== Updates =====
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<color Red>WARNING!!! - </color>I initially got kernel panics when I tested this unit, so using a standard USB nic, you need to do the following:
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    sudo apt-get update
    sudo apt-get upgrade
    sudo rpi-update (this forces a kernel update)
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===== Testing =====
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You can use a command line version of speedtest.net if you install it…
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    sudo apt-get install python-pip
    sudo easy_install speedtest-cli
    
    Run it with speedtest-cli
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I am currently getting:\\ 
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<color orange>4Mb/s Download</color>\\ 
<color orange>3Mb/s Upload</color>\\ 
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The best part is that it is super reliable (and cheap) and we can still use the USB port for something else :)
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{{:gpio_spi_nic.jpg?400|}}{{:gpio_spi_nic_2.jpg?400|}}
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