mirror of
https://github.com/semaf/MFRC522_I2C_Library.git
synced 2025-06-24 22:41:33 +02:00
55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
#include <Wire.h>
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#include "MFRC522_I2C.h"
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#define RST_PIN 6 // Arduino UNO Pin
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// #define RST_PIN 14 // D5 Pin on NodeMCU
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// 0x28 is i2c address on SDA. Check your address with i2cscanner if not match.
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MFRC522 mfrc522(0x28, RST_PIN); // Create MFRC522 instance.
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void setup() {
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Serial.begin(115200); // Initialize serial communications with the PC
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Wire.begin(); // Initialize I2C
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mfrc522.PCD_Init(); // Init MFRC522
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ShowReaderDetails(); // Show details of PCD - MFRC522 Card Reader details
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Serial.println(F("Scan PICC to see UID, type, and data blocks..."));
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}
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void loop() {
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// Look for new cards, and select one if present
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if ( ! mfrc522.PICC_IsNewCardPresent() || ! mfrc522.PICC_ReadCardSerial() ) {
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delay(50);
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return;
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}
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// Now a card is selected. The UID and SAK is in mfrc522.uid.
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// Dump UID
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Serial.print(F("Card UID:"));
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for (byte i = 0; i < mfrc522.uid.size; i++) {
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Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
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Serial.print(mfrc522.uid.uidByte[i], HEX);
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}
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Serial.println();
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}
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void ShowReaderDetails() {
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// Get the MFRC522 software version
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byte v = mfrc522.PCD_ReadRegister(mfrc522.VersionReg);
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Serial.print(F("MFRC522 Software Version: 0x"));
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Serial.print(v, HEX);
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if (v == 0x91)
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Serial.print(F(" = v1.0"));
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else if (v == 0x92)
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Serial.print(F(" = v2.0"));
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else
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Serial.print(F(" (unknown)"));
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Serial.println("");
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// When 0x00 or 0xFF is returned, communication probably failed
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if ((v == 0x00) || (v == 0xFF)) {
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Serial.println(F("WARNING: Communication failure, is the MFRC522 properly connected?"));
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}
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}
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