Description
The HW-126 is a common hardware revision or model designation for the popular RC522 RFID Reader/Writer Module. It is a highly integrated communication device that operates on the 13.56 MHz frequency, primarily used for contactless data exchange in DIY electronics and security projects.
Key Technical Specifications
The HW-126/RC522 module is designed for low-power, compact applications:
- Operating Frequency: 56 MHz.
- Operating Voltage: 3V DC (Note: Connecting it to a 5V pin can destroy the module).
- Current Consumption: 13–26mA (working), <80uA (sleep mode).
- Communication Protocol: SPI (Serial Peripheral Interface).
- Supported Card Types: Mifare1 S50, Mifare1 S70, Mifare UltraLight, Mifare Pro, and Mifare Desfire.
- Read Range: Approximately 0–60mm, depending on the tag and environment.
Standard Pinout for Integration
When connecting the HW-126 to microcontrollers like the Arduino Uno, the following pin mapping is typically used:
- VCC: 3V (Must be 3.3V)
- RST: Reset (often digital pin 9)
- GND: Ground
- MISO: Master In Slave Out (digital pin 12)
- MOSI: Master Out Slave In (digital pin 11)
- SCK: Serial Clock (digital pin 13)
- SDA (SS): Slave Select (digital pin 10)
Common Applications
The HW-126 is frequently found in “Arduino Security Starter Kits” and is used for:
- Access Control: Unlocking digital door locks using authorized RFID tags.
- Attendance Systems: Tracking entries and exits in a workplace or school.
- Inventory Management: Identifying and tracking labeled items.
- Smart Meters: Used in portable hand-held devices for data collection
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