View source for M5Stack RFID Unit MFRC522/RFID 2 Unit WS1850S

[[Image:TArduinoM5StackRFIDUnit.png]]

== Summary ==
I2C RFID reader/writer module supporting MIFARE and ISO/IEC 14443 Type A protocols with configurable antenna gain, collision detection, and low-power operation.

== Description ==
The M5Stack RFID Unit MFRC522/RFID 2 Unit WS1850S is a highly integrated RFID reader IC designed for 13.56MHz contactless communication. It provides configurable antenna gain, multiple modulation schemes, CRC error detection, and full support for MIFARE Classic and ISO/IEC 14443 Type A protocols. The component features advanced signal processing, collision detection, and programmable transmitter/receiver parameters for flexible RFID system integration. Typical applications include access control systems, inventory tracking, contactless payments, and smart object identification.

<b>Diagram:</b>

[[Image:TArduinoM5StackRFIDUnit.Preview.png]]

== Properties ==
*'''Address''' – I2C device address (Default: 0x28).
*'''Antenna''' – Antenna configuration.
**'''Enabled''' – Enables antenna (Default: True).
**'''Gain (dB)''' – Antenna gain level (Options: 18, 23, 33, 38, 43, 48) (Default: 33dB).
*'''Card Operations''' – Card operation elements:
**'''Unbrick''' – Card recovery operation.
**'''Change ID''' – ID modification operation.
**'''Sector''' – Sector operations.
*'''CRC''' – CRC configuration.
**'''Most Significant Byte First''' – MSB-first CRC calculation (Default: False).
**'''Preset''' – CRC preset value (Options: 0x6363, 0x0000, 0xA671, 0xFFFF) (Default: 0x6363).
*'''Interrupt''' – Interrupt configuration.
**'''Enabled''' – Enables interrupts (Default: True).
**'''Inverted''' – Interrupt polarity inversion (Default: False).
**'''Open Drain''' – Open-drain interrupt output (Default: False).
*'''Name''' – Component identifier (Default: RFID).
*'''Parity Check''' – Parity checking (Default: True).
*'''Power Down''' – Power-down mode (Default: False).
*'''Receiver''' – Receiver configuration.
**'''Auto Deactivate''' – Automatic deactivation (Default: True).
**'''Conductance Values''' – Conductance values configuration.
**'''Negative''' – Negative signal processing.
***'''Continuous Wave''' – Negative continuous wave (Default: 8).
***'''Modulation''' – Negative modulation (Default: 8).
**'''Positive''' – Positive signal processing.
***'''Continuous Wave''' – Positive continuous wave (Default: 32).
***'''Modulation''' – Positive modulation (Default: 32).
**'''CRC''' – Receiver CRC (Default: False).
**'''Decode Channel''' – Decode channel selection.
***'''Auto Select''' – Automatic channel selection (Default: True).
***'''Freeze During Communication''' – Freeze during communication (Default: True).
***'''Use In-Phase Channel(I)''' – Use I-channel (Default: False).
**'''Enabled''' – Enables receiver (Default: True).
**'''External Input''' – External input configuration.
**'''Demodulate''' – Demodulation settings.
***'''Enabled''' – Enables demodulation (Default: False).
**'''Frame Guard Delay (Clock...)''' – Frame guard delay.
**'''Ignore Errors''' – Error ignoring (Default: False).
**'''Minimal Signal Levels''' – Minimum signal levels.
**'''Collision''' – Collision detection level (Default: 4).
**'''Decode''' – Decode level (Default: 8).
**'''Phase Locked Loop Time''' – PLL timing.
**'''Burst''' – Burst mode (Default: 1).
**'''Data Receiving''' – Data receiving mode (Default: 3).
**'''Power Down''' – Receiver power down (Default: False).
**'''Speed (kBd)''' – Receiver speed (Default: 106kBd).
*'''Transmitter''' – Transmitter configuration.
**'''Additional Response Time''' – Additional response time (Default: 2).
**'''CRC''' – Transmitter CRC (Default: False).
**'''External Output Pin Mode (MFOL)''' – External output mode (Options: ThreeState, Low, High, Test, Modulation, TransmitterStream, ReceiverStream) (Default: ThreeState).
**'''Force Amplitude Shift Keying''' – Force ASK modulation.
***'''Inverted''' – Inverted modulation (Default: True).
***'''Inverted External Input (MFIN)''' – Inverted external input (Default: False).
**'''Miller Modulation Width''' – Miller modulation width (Default: 38).
**'''Outputs''' – Output configuration.
***'''Enabled''' – Enables outputs (Default: True).
***'''External Modulation''' – External modulation (Default: False).
***'''Pin1 (TX1)''' – TX1 pin configuration.
****'''Enabled''' – Enables TX1 (Default: True).
****'''Inverted When Disabled''' – Invert when disabled (Default: False).
****'''Inverted When Enabled''' – Invert when enabled (Default: False).
***'''Pin2 (TX2)''' – TX2 pin configuration.
****'''Enabled''' – Enables TX2 (Default: True).
****'''Inverted When Disabled''' – Invert when disabled (Default: False).
****'''Inverted When Enabled''' – Invert when enabled (Default: False).
**'''Unmodulated''' – Unmodulated output (Default: False).
**'''True State''' – True state output (Default: False).
**'''Remain Active''' – Remain active mode (Default: False).
**'''Speed (kBd)''' – Transmitter speed (Default: 106kBd).

== Pins ==
=== Input Pins ===
*'''Interface''' (i2c) – I2C communication interface.
*'''Reset''' (digital) – Hardware reset signal.

=== Output Pins ===
*'''Card Detected''' (digital) – Card detection signal.
*'''Card Type''' (text) – Card type identification.
*'''Card ID''' (binary) – Card ID identification.
*'''Version''' (integer) – Card version information.
*'''Overheated''' (digital) – Overheating detection.

== Categories ==
*[[Image:I2C.png]] [[Category:I2C]] – I2C communication interface components.
*[[Image:RFID.png]] [[Category:RFID]] – RFID reader/writer components.
*[[Category:Wireless]] – Wireless communication components.
*[[Image:Security.png]] [[Category:Security]] – Security and access control components.
*[[Image:Communication.png]] [[Category:Communication]] – Communication protocol components.