How to Read and Write NFC Tags with ELECHOUSE Modules

Reading and Writing NFC Tags

ELECHOUSE NFC modules support all major NFC tag types used in consumer and industrial applications. This guide covers tag type selection, protocol compatibility, and code examples for reading and writing NFC tags with Arduino, ESP32, and Raspberry Pi / Linux.

Supported NFC Tag Types

Tag Type Standard Common Products Read Write
MIFARE Classic 1K / 4K ISO 14443A Key fobs, transit cards ✓ ✓
MIFARE Ultralight / NTAG ISO 14443A NTAG213, 215, 216 stickers ✓ ✓
MIFARE DESFire EV1 / EV2 ISO 14443A Secure access credentials ✓ ✓*
ISO 14443B ISO 14443B Bank cards, ID cards UID only No
FeliCa ISO 18092 / JIS 6319 Suica, Octopus, WAON ✓ ✓
ISO 15693 / NFC-V ISO 15693 Industrial labels, ICODE PN7160/ST25R3916 PN7160/ST25R3916
NDEF (any tag) NFC Forum NFC stickers with URL/text ✓ ✓

* DESFire write requires authentication keys

Module Selection for Tag Reading / Writing

Arduino / ESP32 — Read NTAG UID

#include <PN532.h>
#include <PN532_SPI.h>

PN532_SPI pn532spi(SPI, 10);  // SS = pin 10
PN532 nfc(pn532spi);

void setup() {
  Serial.begin(115200);
  nfc.begin();
  nfc.SAMConfig();
}

void loop() {
  uint8_t uid[7]; uint8_t uidLen;
  if (nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLen)) {
    Serial.print("UID: ");
    for (int i=0; i<uidLen; i++) { Serial.print(uid[i], HEX); Serial.print(" "); }
    Serial.println();
  }
  delay(500);
}

Raspberry Pi / Linux — Read NFC Tag (nfcpy)

import nfc

def on_connect(tag):
    print("Tag found:", tag.identifier.hex())
    return True

with nfc.ContactlessFrontend('usb') as clf:
    clf.connect(rdwr={'on-connect': on_connect})

Writing NDEF Data to an NTAG

// Arduino: write URL to NTAG213
nfc.ntag2xx_WritePage(4, (uint8_t[]){0x03, 0x0F, 0xD1, 0x01});
nfc.ntag2xx_WritePage(5, (uint8_t[]){0x0B, 0x55, 0x04, 'e'});
// ... etc

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