Supplying 5V to the main power pin can damage the module
R503 / R503-M22 Capacitive Fingerprint Module (3.3V, UART)
Product Overview
The R503 / R503-M22 is a high-performance capacitive fingerprint recognition module with onboard image processing and matching algorithm. It operates at DC 3.3V and communicates via UART (TTL), making it ideal for embedded systems, access control, smart locks, and attendance devices.
The module integrates fingerprint image capture, feature extraction, template storage, and comparison, requiring no external processing.
Main Features
- Capacitive fingerprint sensing technology
- High recognition accuracy and fast response
- Onboard fingerprint processing and matching
- UART (TTL) communication interface
- Supports fingerprint enrollment, deletion, and matching
- RGB LED ring indicator (model dependent)
- Low power consumption
- Compact round design (M22 mechanical option available)
Electrical Specifications
Parameter | Value |
|---|---|
| Operating Voltage | DC 3.3 V |
| Working Current | ≤ 20 mA |
| Standby Current | ≤ 2 µA |
| Communication Level | TTL 3.3 V |
| Interface | UART (Serial) |
Fingerprint Performance
Parameter | Value |
|---|---|
| Sensor Type | Capacitive |
| Image Resolution | 508 DPI |
| Image Size | 192 × 192 pixels |
| Recognition Time | < 0.3 s |
| Fingerprint Capacity | 200 templates |
| Matching Modes | 1:1 (Verification), 1:N (Identification) |
| FAR (False Acceptance Rate) | < 0.001% |
| FRR (False Rejection Rate) | < 1% |
Communication Parameters
Parameter | Value |
|---|---|
| Default Baud Rate | 57600 bps |
| Data Bits | 8 |
| Stop Bits | 1 |
| Parity | None |
| Protocol | UART packet-based command protocol |
Environmental Conditions
Parameter | Value |
|---|---|
| Operating Temperature | -20°C to +60°C |
| Operating Humidity | 10% – 85% RH (non-condensing) |
| Storage Temperature | -40°C to +85°C |
Mechanical Information
Model | Description |
|---|---|
| R503 | Standard round fingerprint module |
| R503-M22 | M22 mounting diameter, compact design |
| Connector | 6-Pin SH1.0 |
| Indicator | RGB LED ring (controlled via command) |
Pin Definition (6-Pin Connector)
Pin | Function |
|---|---|
| 1 | VCC (3.3V) |
| 2 | GND |
| 3 | TX (UART) |
| 4 | RX (UART) |
| 5 | Touch / Wake |
| 6 | LED Control |
Supported Functions
- Fingerprint enrollment
- Fingerprint deletion (single or all)
- Fingerprint comparison (1:1 & 1:N)
- Template storage & management
- LED status control
- Sleep & wake-up control
Typical Applications
- Access control systems
- Smart locks
- Time & attendance devices
- Embedded security projects
- IoT authentication systems
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