I just bought an RFID mc522 module for arduino. Downloaded the library from miguelbalboa. loaded the example for readandwrite, hooked up the pins to my arduino uno. upload it, and opened serial monitor.
it did not ready any of the tags that it came along with it. how do i know that the module is in good condition?
my question you know is "how to check if my module is working properly". what i ment with this is that how would i know if the product i bought did not contain any defects hardware - wise. i can assure you that i did connect all the pins correctly and i pretty much trust the code that came with it..
How to determine if the module is working correctly depends on the specific breakout board; the manufacturer may provide a test procedure. Often though, you will need to write a sketch to test it - which leads you to the awkward situation of not knowing whether the problem is your wiring, your test sketch, or the module. This is a problem we all face.
"it did not ready any of the tags that it came along with it."
Assuming you meant to say "It failed to read any of the RFID tags that came with it." then you can be sure that something is wrong with the hardware or software.
For the code i just used the one that came with the library. I cut the code because it exceeds the allowable length
/**
* ----------------------------------------------------------------------------
* This is a MFRC522 library example; see https://github.com/miguelbalboa/rfid
* for further details and other examples.
*
* NOTE: The library file MFRC522.h has a lot of useful info. Please read it.
*
* Released into the public domain.
* ----------------------------------------------------------------------------
* This sample shows how to read and write data blocks on a MIFARE Classic PICC
* (= card/tag).
*
* BEWARE: Data will be written to the PICC, in sector #1 (blocks #4 to #7).
*
*
* Typical pin layout used:
* -----------------------------------------------------------------------------------------
* MFRC522 Arduino Arduino Arduino Arduino Arduino
* Reader/PCD Uno/101 Mega Nano v3 Leonardo/Micro Pro Micro
* Signal Pin Pin Pin Pin Pin Pin
* -----------------------------------------------------------------------------------------
* RST/Reset RST 9 5 D9 RESET/ICSP-5 RST
* SPI SS SDA(SS) 10 53 D10 10 10
* SPI MOSI MOSI 11 / ICSP-4 51 D11 ICSP-4 16
* SPI MISO MISO 12 / ICSP-1 50 D12 ICSP-1 14
* SPI SCK SCK 13 / ICSP-3 52 D13 ICSP-3 15
*
*/
#include <SPI.h>
#include <MFRC522.h>
#define RST_PIN 9 // Configurable, see typical pin layout above
#define SS_PIN 10 // Configurable, see typical pin layout above
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
MFRC522::MIFARE_Key key;
/**
* Initialize.
*/
void setup() {
Serial.begin(9600); // Initialize serial communications with the PC
while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
SPI.begin(); // Init SPI bus
mfrc522.PCD_Init(); // Init MFRC522 card
// Prepare the key (used both as key A and as key B)
// using FFFFFFFFFFFFh which is the default at chip delivery from the factory
for (byte i = 0; i < 6; i++) {
key.keyByte[i] = 0xFF;
}
Serial.println(F("Scan a MIFARE Classic PICC to demonstrate read and write."));
Serial.print(F("Using key (for A and B):"));
dump_byte_array(key.keyByte, MFRC522::MF_KEY_SIZE);
Serial.println();
Serial.println(F("BEWARE: Data will be written to the PICC, in sector #1"));
}
/**
* Main loop.
*/
void loop() {
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent())
return;
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial())
return;
// Show some details of the PICC (that is: the tag/card)
Serial.print(F("Card UID:"));
dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
Serial.println();
Serial.print(F("PICC type: "));
MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
Serial.println(mfrc522.PICC_GetTypeName(piccType));
// Check for compatibility
if ( piccType != MFRC522::PICC_TYPE_MIFARE_MINI
&& piccType != MFRC522::PICC_TYPE_MIFARE_1K
&& piccType != MFRC522::PICC_TYPE_MIFARE_4K) {
Serial.println(F("This sample only works with MIFARE Classic cards."));
return;
}
// In this sample we use the second sector,
// that is: sector #1, covering block #4 up to and including block #7
byte sector = 1;
byte blockAddr = 4;
byte dataBlock[] = {
0x01, 0x02, 0x03, 0x04, // 1, 2, 3, 4,
0x05, 0x06, 0x07, 0x08, // 5, 6, 7, 8,
0x08, 0x09, 0xff, 0x0b, // 9, 10, 255, 12,
0x0c, 0x0d, 0x0e, 0x0f // 13, 14, 15, 16
};
byte trailerBlock = 7;
MFRC522::StatusCode status;
byte buffer[18];
byte size = sizeof(buffer);
.............
Here is a picture of the wiring and the board.
For the tags that came along when i bought it. i Have tried reading it using my android and it works
here is the tag on top of the module and a snap of the serial monitor.
I apologize for the time between posts, but the solution to this problem, the images by the OP are not loading - so the problem for anyone new encountering it (like myself) is still just that - a problem.
The OP figured out why pins 9 and 10 were asking for redefinition (on an Arduino Uno 3 w/RC522 Module at 3.3v, the setup using power drawn from a USB 2.0 cable connected to a laptop computer, using the libraries as posted from GitHub.com and using the most recent Arduino IDE available currently) - can anyone explain what is happening here causing the board to continually register this problem and how one might fix it (w/o an "expert" on an open forum soliciting money for writing code preferably...)? I've googled this numerous times - the problem has persisted since 2014...never a clear answer except potentially by the OP in this topic...but w/o the images, I still fail to understand...
The output I receive is exactly the same, and it's a brick wall that really makes no sense.
I'm half tempted to ditch the Uno R3 and use an esp8266 board since there seems to be no pinning v coding problems...perhaps even a Pi 3+...? But, ~4 yrs. of reading back about this problem up to this post, if the OP isn't reading, perhaps someone else can explain this recurring issue..(?)