I'm trying to do it with my android that's where I'm stuck at.

Wouldn't it be easier to get a PN532, attach it to your Nano and update with it? Just solder the pins on the opposite side of the EMU.

I can't really help with an Adroid as I don't have a phone that's capable.

Very simple solder and you can use a micro usb phone plug is good enough and I just keep plug in.

MFJ55 if you need any help let me know thx for the info but I still stuck trying to use my phone to write the uid pack and pass on the emutag with my android like I said you can only fit 8 characters but it has 12 just confused.

I am a little confused with this post. It appears as though you are powering the EMU Tag from the Nano. How are you updating the EMU Tag using the same Nano?

MFJ55 if you need any help let me know thx for the info but I still stuck trying to use my phone to write the uid pack and pass on the emutag with my android like I said you can only fit 8 characters but it has 12 just confused.

Yes I got that, where I'm stuck is that put the uid pack pass on what lines and how to read the excel list that was put together. The his shows 14 characters when you only can only enter 8.
I have my emutag on a plug instead of the batteries so that's not the issue. Thanks for the help.

Richie, This should help you some.  The easiest way to get started is to copy/paste kallt_kaffe data that he posted here ( http://www.soliforum.com/post/134377/#p134377 ) into a text file.  It is currently set up with a valid UID, Password and PACK.  You can just use it as is.  You MUST save it with only LF ( not CR LF ) for the end of line.  The easiest way is either to use Linux, or use Notepad++ and under the EDIT -> EOL Conversion -> select UNIX (LF).  An easy way to test it is done correctly is after saving the file, open it in NOTEPAD ( not NOTEPAD++) and it should appesaar as a long single line.
Now just transfer that file to your android phone, and using the MIFARE++ Ultralitght app, Load the file and Write the file to the EMUtag.  You are now ready to use it.

Now, for the CSV file and how to read it, hear is an example ( first line )
Card UID                                            Psw                              PAK   
4    6C    64    2A    B4    42    80        8A    4E    27    6C        8B    1E
^
Note the 4 above is 04 as excel drops the leading 0

The first 3 bytes (04 6C 64 ) goes into Page 0, ( and counting bytes left to right starting at 0 ) bytes 0, 1 2.
The next 4 bytes (2A B4 42 80) goes into Page 1, bytes 0,1,2,3

The Psw ( Password ) goes into Page 0x2B ( 43 decimal ) bytes 0,1,2,3
The Pack goes into Page 0x2C (44 decimal) bytes 0,1.

See this link for Page and data dafynitions. -> http://www.soliforum.com/post/128824/#p128824

So I hope that answers you questions.  Have fun..........

EDIT: how did you hook up your EMUtag to the plug?  I want to do the same thing and wanted your input.  thanks

Can someone show a step by step using mifare ultralite using an android phone I'm still a little confused putting the uid

I know this is thread is a little old, but I hope you see it. 
I too could not use the MIFARE++ Ultralitght app at all.  It NEVER read anything.  Even failed on my EMUtag whereas the RFID NFC Tool app worked.
HOWEVER, I found there is a specific process ( sequence of events) that must be followed or you will get no response.  Here they are.
0 - Make sure that the battieries are installed and the little paper that says 'Pull Me' is removed.  Dont ask me why this is # 0.
1- Make sure your android NFC is on ( in the settings)
2- Open the app ( MIFARE++ Ultralight ).
3- Press the READ button.
4- NOW place the phone over the EMUtag (real close or touching ).  You may need to move the phone a little to find the android NFC antenna. 

It is a little slow, but it works.
It has read perfectly for me ( 8 of 8 tries )

Hope this helps.

Can someone show a step by step using mifare ultralite using an android phone I'm still a little confused putting the uid

Mifare does not work as this is not a Mifare chip you are dealing with. Try using RFID NFC Tool.

If you are worried about the batteries running out over a long print, you could supply the power from a single 18650 (or other cell) lithium cell and connect it to the PCB, but be careful.

You could also find 5V on the printer and use this to supply the PCB.

The emutag FAQ shows these connections for external power

REMEMBER that you can't have a 5v source connected at the same time as the batteries or you're effectively putting current through the batteries.
They will explode (pop!) if you do it for any length of time.

You could also find 5V on the printer and use this to supply the PCB.

The emutag FAQ shows these connections for external power

Bozotclown1970 wrote:

You are way to worried about the batteries. The EMU is just like any other electronic device. It needs power to work and that's what the batteries are for. When they go dead you re-flash the EMU and put data back into the EMU and start printing again.

What's necessary to re-flash the EMU?  I'm looking at getting an EMUtag, but only have my android phone to read/write it with. Is an adruino necessary for reflashing?  I just don't want to buy an EMUtag and end up dead in the water after 18hrs of printing.

I can't say an Arduino is the only way to flash an EMU Tag, but I can tell you it is really easy if you use one. If you would like more information on updating/flashing your EMU Tag PM me or cgrillo.