Hello im trying to make a program to compare the NFC tag #ID, im very used to Arduino, but im not used to SPI Programming.
i searched a lot, but i dont really know what i need exactly.
im trying match the NFC tag #ID and the variable NFC1.
Can anyone help me? please?
i just need some info/help to make the if statement work.
#include <PN532.h>
#include <SPI.h>
//SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK)
/*Chip select pin can be connected to D10 or D9 which is hareware optional*/
/*if you the version of NFC Shield from SeeedStudio is v2.0.*/
#define PN532_CS 10
PN532 nfc(PN532_CS);
#define NFC_DEMO_DEBUG 1
int BUZZER = 6;
uint32_t NFC1 = 3795120787;
int NFC2 = 3262404755;
int NFC3 = 46356883;
int NFC4 = 35320979;
int NFC5 = 3257334163;
void setup(void) {
pinMode(BUZZER, OUTPUT);
#ifdef NFC_DEMO_DEBUG
Serial.begin(9600);
Serial.println("Hello!");
#endif
nfc.begin();
uint32_t versiondata = nfc.getFirmwareVersion();
if (! versiondata) {
#ifdef NFC_DEMO_DEBUG
Serial.print("Didn't find PN53x board");
Serial.print("");
#endif
while (1); // halt
}
#ifdef NFC_DEMO_DEBUG
// Got ok data, print it out!
Serial.print("Found chip PN5");
Serial.println((versiondata>>24) & 0xFF, HEX);
/*Serial.print("Firmware ver. ");
Serial.print((versiondata>>16) & 0xFF, DEC);
Serial.print('.');
Serial.println((versiondata>>8) & 0xFF, DEC);
Serial.print("Supports ");
Serial.println(versiondata & 0xFF, HEX);*/
#endif
// configure board to read RFID tags and cards
nfc.SAMConfig();
}
void loop(void) {
uint32_t id;
// look for MiFare type cards
id = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A);
if (id != 0) {
#ifdef NFC_DEMO_DEBUG
Serial.println("");
Serial.print("Card #");
Serial.println(id);
analogWrite(BUZZER, 50);
delay(100);
analogWrite(BUZZER, 0);
delay(1000);
#endif
//char ch = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A);
if(NFC1 = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A)){
analogWrite(6, 255);
delay(250);
analogWrite(6, 0);
/*analogWrite(BUZZER, 50);
delay(50);
analogWrite(BUZZER, 0);
delay(50);
analogWrite(BUZZER, 50);
delay(50);
analogWrite(BUZZER, 0);*/}
else {
analogWrite(5, 255);
delay(250);
analogWrite(5, 0);
/*analogWrite(BUZZER, 50);
delay(100);
analogWrite(BUZZER, 0);
delay(100);
analogWrite(BUZZER, 50);
delay(100);
analogWrite(BUZZER, 0);
delay(100);
analogWrite(BUZZER, 50);
delay(100);
analogWrite(BUZZER, 0);*/}
}
}
Common mistake and the compiler could have helped you
Change this line:
uint32_t NFC1 = 3795120787;
To this line:
const uint32_t NFC1 = 3795120787;
You will now get a compiler error, which would have resulted in you going :o.
This line needs a == , not a = . Not this:
if(NFC1 = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A)){ / doh!
This:
if(NFC1 == nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A)){ / ahh
Side note, this is a common typing error and reason why
if(1 == somevar) // is superior to
if(somevar == 1) // something that seems exactly the same
Because the compiler will tell you
if(1 = somevar) // no, you can't assign to a constant
if(somevar = 1) // okay, whatever you want boss
This advice is from "Writing Solid Code", Maguire and Moore, and has served me well.
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