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Minimum pins required for NFC shield
Moderators: adafruit_support_bill, adafruit

Minimum pins required for NFC shield

by Mimi_Salade on Tue Nov 20, 2012 12:31 pm

Hi everybody!

The way I soldered the pins on my NFC Shield makes it non-stackable.
I mean, I can plug it in my arduino, but I can't plug anything else on top of it.

That's why i'd like to know which are the pins used by the shield (so i can connect it with wires, without stacking it).

The code looks like this:

#define IRQ (2)
#define RESET (3) // Not connected by default on the NFC Shield

But I keep getting the message "Didn't find PN53x board" if I don't plug in the analog 4-5 and digital 10-3 pins.

I had a look at the library but I don't understand where the arduino polls the shield on other pins thant _irq or _reset (2 and 3).

Thanks for your help :)

Kate.
Mimi_Salade
 
Posts: 11
Joined: Sun Aug 12, 2012 3:24 pm

Re: Minimum pins required for NFC shield

by Mimi_Salade on Tue Nov 20, 2012 12:42 pm

Found my answer looking at the Wire library : http://arduino.cc/en/Reference/Wire

I2C uses pins A4 & A5, _irq uses pin D2.
Reset on pin D3 is optionnal.

Sorry for double-post.
Kate.
Mimi_Salade
 
Posts: 11
Joined: Sun Aug 12, 2012 3:24 pm