Overview
The rfid node reads and writes RFID tags using MFRC522 and PN532 readers.
Implement access control systems, inventory tracking, library management, and asset identification
with MIFARE Classic and Ultralight tags operating at 13.56MHz.
Properties
| Property | Type | Required | Default | Description |
|---|---|---|---|---|
| reader | string | Yes | "mfrc522" | "mfrc522" | "pn532" reader hardware |
| interface | string | No | "spi" | "spi" | "i2c" communication interface |
| mode | string | Yes | "detect" | "read" | "write" | "detect" operation mode |
| sector | number | No | 0 | Memory sector to read/write (0-15 for 1K) |
| key | string | No | "FFFFFFFFFFFF" | Authentication key (6 bytes hex) |
| blockData | string | No | - | Data to write to tag (16 bytes max per block) |
| continuous | boolean | No | true | Continuously poll for new tags |
Inputs
{
"payload": {
"command": "read",
"sector": 1,
"block": 0,
"key": "FFFFFFFFFFFF"
}
}{
"payload": {
"command": "write",
"sector": 1,
"block": 0,
"data": "Hello EdgeFlow!!"
}
}Outputs
{
"payload": {
"uid": "A1:B2:C3:D4",
"type": "MIFARE_1K",
"sector": 0,
"data": "Hello EdgeFlow",
"timestamp": "2024-01-15T10:30:45Z"
}
}{
"payload": {
"uid": "A1:B2:C3:D4",
"status": "written",
"sector": 1,
"block": 0,
"bytesWritten": 16
}
}Use Case Examples
Access Control
Build door access systems that verify RFID badges against an authorized UID list and log entry events.
Inventory
Tag and track inventory items with writable RFID tags containing product information and location data.
Library Systems
Implement self-checkout and book tracking systems using RFID-tagged library materials.
Pet ID
Read pet microchip tags (ISO 11784/11785) for animal identification and registration lookup.
Tips & Best Practices
MFRC522 uses SPI for faster communication. PN532 supports SPI, I2C, and UART for more flexible wiring options.
Change default authentication keys (FFFFFFFFFFFF) in production. Default keys make tags readable by anyone.
Never write to sector 0, block 0 of a MIFARE tag - it contains the manufacturer data and UID. Corrupting it bricks the tag.