I have an Arduino Uno that I want to use the Copperhead wifi shield : http://www.linksprite.com/product/showproduct.php?id=73&lang=en and the PN532 NFC shield : http://linksprite.com/wiki/index.php5?title=NFC_PN532_Shield#Schematic with.
Both want to use pin 10 as the SS pin for SPI, so I’ve rerouted pin 8 on the Uno to pin 10 on the NFC board (the wifi is in the middle, using pin 10 as usual).
Both boards work perfectly well independently, including rerouting pin 8 to pin 10 for the NFC board. I’ve even bent pin 8 out on the wifi board to make absolutely sure nothing is interfering with that pin. Also, the wifi board is set to use pin 2 for the interrupt.
When I stack them together, the wifi shield still works, but the software is unable to find the NFC board. I thought maybe power was an issue, so I added an external power supply, but that had no effect.
Any ideas? Pins 11 - 13 for SPI SHOULD be stackable. I’m at a bit of a loss. Any thoughts would be greatly appreciated!!