I resently bought a Raspberry Pi 3 model b and with it an NFT module, the ITEAD PN532. Unfornatly there wasn't the gpio connector, so i bought one on amazone which convert 40 to 26 pin. I don't know much on how things works with gpio et the electronical aspect of the rapberry. So i looked into this forum :
After setting the SPI mode as explained, i linked the module to the rapberry this way:
Nothing happened when powering on the R. pi, led were not turned on. So i decided to connected the other way.
After turning on the device, led turned on and like a short circuit happened ... with smoke going out of the nfc board. I instanstly turned off the R.pi. I thought the NFC module was completly dead but tried to turn it on again for 2 seconds, the led is working on it but i think that there some king of wrong voltage on it.
Wath is the correct way to connect the module.