Quectel FC41D BT & WiFi Module
Overview
The Boardoza FC41D is a robust, dual-mode wireless connectivity solution powered by the Quectel FC41D engine, a high-performance MCU-based module optimized for the IoT (Internet of Things) ecosystem. This breakout board seamlessly integrates Wi-Fi 4 (802.11 b/g/n) and Bluetooth 5.2 (Low Energy) capabilities into a single compact platform, enabling reliable, high-speed data transmission for industrial automation, smart home infrastructures, and remote sensing networks.
Designed for flexibility, the module features a powerful embedded processor running at 120 MHz, supported by 256 KB of RAM and up to 4 MB of Flash memory. Its "LCC" form factor architecture ensures high vibration resistance, while the breakout design provides easy access to critical interfaces via standard headers, making it an ideal choice for both rapid prototyping and scalable deployment.
Core Technical Specifications
The module is defined by the following operational parameters:
Wireless Protocol: Supports IEEE 802.11 b/g/n (2.4 GHz) for Wi-Fi and Bluetooth 5.2 for robust local connectivity.
Processor Architecture: High-efficiency MCU core clocked at 120 MHz, handling both the networking stack and user applications.
Throughput: Capable of Wi-Fi physical layer rates up to 72.2 Mbps (1x1 SISO), ensuring sufficient bandwidth for video streaming or bulk telemetry.
Memory Resources: Equipped with 256 KB of RAM and typically 2 MB or 4 MB of Flash, supporting complex firmware logic and secure Over-The-Air (OTA) updates.
Input Voltage: Designed for broad compatibility with a 5V DC supply input, which is regulated onboard for the module's core logic.
Operating Temperature: Engineered for harsh industrial environments, functioning reliably from -40°C to +85°C.
Physical Dimensions: A standardized 40 mm x 40 mm footprint with mounting holes for secure chassis integration.
Key Engineering Features
Integrated Network Security
The FC41D prioritizes data integrity with native support for advanced security standards, including WPA-PSK, WPA2-PSK, and WPA3-SAE. This ensures that critical IoT data streams remain protected against unauthorized access and replay attacks, a mandatory requirement for modern commercial deployments.
Versatile Interface Connectivity
To facilitate deep system integration, the board exposes a comprehensive set of peripheral interfaces. It supports UART (for AT commands and data), SPI, I2C, ADC, and PWM, allowing the module to directly control sensors, actuate motors, or interface with other local peripherals without needing a secondary microcontroller.
Power-Optimized Architecture
The module is designed for energy-sensitive applications. It features multiple low-power modes and a dedicated "keep-alive" mechanism, minimizing quiescent current consumption during idle periods while maintaining network association. This makes it highly suitable for battery-powered end-nodes and portable diagnostics equipment.
Hardware Interface and Signal Mapping
The breakout board simplifies connectivity by breaking out the module's high-density pins into standard 2.54mm pitch headers, organized by function:
Communication Interfaces
TX / RX: UART Transmit and Receive lines. These are the primary channels for sending AT commands and data payloads to the host MCU.
SCL / SDA: I2C clock and data lines for interfacing with sensors or displays.
CLK / MISO / MOSI / CS: Standard SPI bus pins for high-speed data transfer.
System Control and Power
VIN: Positive power input (5V). This rail powers the onboard regulator.
GND: Common system ground reference.
RST: Hardware Reset pin. Pulling this line triggers a system reboot, useful for recovering from error states.
WKP (Wakeup): A dedicated input pin used to wake the module from deep sleep modes based on external events.
Applications
Smart Home Automation: Wireless control of lighting, thermostats, and smart plugs via local Wi-Fi.
Industrial Telemetry: Secure transmission of sensor data from factory floor machinery to cloud dashboards.
Wearable Technology: Bridging Bluetooth health monitors to Wi-Fi networks for remote patient monitoring.
Remote Asset Tracking: Location and status reporting for logistics containers using low-power beacons.
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