NFC Shield + Arduino Nano

[zenzizenzizenzic]

Hi all,
I've got the I2C NFC Shield and am trying to get it up and running with the Arduino Nano (ATMega328). I am reasonably confident in my solder joints and have power in the NFC Shield. The busy light comes on and stays on the moment power arrives - is this supposed to happen?
Running the readmifare example I get

Hello!
Didn't find PN53x board

I have 5V, GND, SDA, SCL and D2 connected to their counterparts on the Nano. Is the IRQ (#define IRQ (2)) the pin on the ATMega328 or is there some magic remapping the number there from D2 to pin 5? (I think it should be 5 as that's the pin D2 maps to on the Nano.)
Any ideas?

[adafruit_support_bill]

D2 is digital pin 2 on the Arduino. Here are the schematics for reference: https://github.com/adafruit/Adafruit-PN ... NFC-Shield

[zenzizenzizenzic]

OK that's what I thought - I'm coming from the Fez line of microcontrollers where everything was based on microcontroller pin not the number of the digital/analog i/o.
I've attached my solder joints just in case I've done something foolish

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[adafruit_support_bill]

The solder looks good. Both power and busy lights should illuminate on power up. Where do you have SDA and SCL connected? It doesn't show in the photos.

[zenzizenzizenzic]

D2(Shield) to D2(Nano)
SDA(Shield) to D4(Nano)
SCL(Shield) to D5(Nano)
GND(Shield - the one next to 5V) to GND(Nano - the one next to VIN)
5V(Shield) to 5V(Nano) - Power supplied through USB

[adafruit_support_bill]

SDA(Shield) to D4(Nano)
SCL(Shield) to D5(Nano)

Should be
SDA(Shield) to A4(Nano)
SCL(Shield) to A5(Nano)

[zenzizenzizenzic]

Wow. OK - for those wondering the same thing I was, the diagram that comes up most often when you search for "Nano pinout" is wrong: http://2.bp.blogspot.com/-_M5HsO7r1dM/U ... pinout.png
Trust the pinouts (even unofficial) you can find on the arduino forums: http://arduino.cc/forum/index.php?topic=147579.0

Thanks for the help! She works perfectly now!

[adafruit_support_bill]

The Arduino product pages are my usual reference. http://arduino.cc/en/Main/ArduinoBoardNano
It is not as convenient as a pinout diagram, but they are consistently correct.

[zenzizenzizenzic]

I read that page at least a dozen times and missed the segue into analog every time