## Technical Overview: FPM3182H-R010BAQ The **FPM3182H-R010BAQ** is a high-performance fingerprint sensor module. It is commonly used in biometric security systems, smart locks, and attendance terminals. Below is a breakdown of its key electronic characteristics and components. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Sensor Type** | Capacitive Fingerprint Sensor | | **Interface** | UART (Universal Asynchronous Receiver/Transmitter) | | **Supply Voltage (VDD)** | 3.3V DC | | **Operating Current** | < 40mA (Peak), < 5μA (Standby/Sleep) | | **Resolution** | 508 DPI | | **Sensing Area** | 160 x 160 pixels (typical for the 182H series) | | **Verification Speed** | < 0.5 seconds | --- ### 2. Main Electronic Components The module functions as a "system-on-module," integrating several critical parts: * **Capacitive Sensor Array:** Unlike optical sensors that use cameras, this part uses an array of tiny capacitors to measure the voltage difference between the ridges and valleys of a fingerprint. * **On-board MCU (Microcontroller):** This is the "brain" of the module. It runs the biometric algorithms, performs template extraction, and handles the 1:1 or 1:N matching logic. * **Flash Memory:** Used to store encrypted fingerprint templates locally on the device. * **Voltage Regulator:** Ensures the sensitive capacitive array receives a stable 3.3V, protecting it from minor power fluctuations. --- ### 3. Pinout and Connectivity The device typically uses a 6-pin or 8-pin connector for integration. The primary pins include: 1. **VCC:** 3.3V Power input. 2. **GND:** Ground. 3. **TX / RX:** Serial data lines for communicating with an external controller (like an Arduino, ESP32, or PC). 4. **Touch/IRQ:** An interrupt pin that stays "High" or "Low" until a finger is detected, allowing the main CPU to stay in sleep mode to save power. --- ### 4. Communication Protocol The module communicates via **Hexadecimal packets** over the UART interface. * **Default Baud Rate:** Usually 57600 bps. * **Instruction Set:** Includes commands for `Fingerprint Enrollment`, `Search/Verify`, `Delete ID`, and `Empty Library`. ```python # Example logic for communicating with the sensor via UART import serial # Initialize serial port sensor = serial.Serial('/dev/ttyS0', baudrate=57600, timeout=1) def get_image(): # Command packet to capture finger image cmd = b'\xef\x01\xff\xff\xff\xff\x01\x00\x03\x01\x00\x05' sensor.write(cmd) return sensor.read(12) ```