DFRobot Bluetooth 5.0 Audio Receiver Board The Bluetooth 5.0 Audio Receiver Board is a compact and cost-effective solution for adding wireless capabilities to your existing speakers. This versatile Bluetooth audio receiver allows you to easily transform any old speaker system into a modern wireless setup without complicated wiring or expensive replacements. The module features the latest Bluetooth 5.0 technology, ensuring stable connections and quality audio transmission up to 15 meters in visible range. With its automatic reconnect function, you won't need to repeatedly pair your devices - once connected, the module remembers your device for future use. The board can be powered either through a micro-USB connection or a 3.7V lithium battery, giving you flexibility in how you install and use this wireless speaker converter. What makes this Bluetooth 5.0 adapter particularly valuable is its dual functionality. Beyond serving as a wireless audio receiver, it can also function as a computer sound card. By simply short-circuiting the Sound Card pads on the back of the module and connecting it to a computer via USB cable, you can use it as a USB sound card module - perfect for computers with damaged audio outputs or for adding an extra audio interface. The operation is straightforward: after powering on, the blue indicator flashes as the module enters Bluetooth mode and plays an audio prompt while waiting for pairing. Your phone will detect the module as "BT5.0-Audio," and once connected, the indicator remains solid when idle and blinks slowly during music playback. Features: Power supply options: micro-USB or 3.7V lithium battery for flexible installation. Bluetooth version: 5.0 with automatic reconnect function for stable connections. Transmission distance: 15 meters in visible range for wide coverage. Audio decoding support: WAV, APE, FLAC, and MP3 formats. Dual functionality: works as both Bluetooth receiver and computer sound card. Clear connection status indication through LED light patterns. Compact size for easy integration into existing audio systems.

DFRobot Bluno Beetle BLE V1.1 Based on Arduino Uno with Bluetooth 4.0 The Beetle BLE (formerly known as Bluno Beetle) is an ultra-compact miniature Arduino board based on the Arduino Uno with integrated Bluetooth 4.0 (BLE) functionality. This tiny powerhouse combines the familiar Arduino programming experience with wireless capabilities, making it perfect for DIY projects, educational purposes, and wearable electronics applications. The development board can be programmed through its micro USB port using the standard Arduino IDE without any extra libraries or drivers, and it also supports wireless programming via Bluetooth. With its V-shaped gold-plated I/O interfaces, you can easily connect wires without soldering, making it especially useful for creating smart bracelets, clothing, and other wearable devices. This versatile Bluetooth 4.0 microcontroller is fully compatible with Bluno series commands and procedures, supporting both Bluetooth HID and iBeacon modes. The Play Bluno app, available for both iOS and Android, gives you quick access to this tiny board for remote control and wireless program updates. Despite its small size, the Beetle BLE packs impressive features including an ATmega328 microcontroller running at 16MHz, four digital pins, four analog pins, two PWM outputs, and both UART and I2C interfaces. For students and makers on a budget, this compact BLE development board offers an affordable solution for creating wireless projects without sacrificing functionality. Whether you're building a smart device, working on an e-textile project, or teaching electronics, the Beetle BLE delivers big performance in a tiny package. Features ATmega328 microcontroller running at 16MHz for reliable performance Bluetooth 4.0 (BLE) with CC2540 chip and -93dBm sensitivity Maximum wireless range of 50 meters in open field conditions Operating voltage of 5V DC with input voltage less than 8V Four digital pins and four analog pins for connecting various components Two PWM outputs for motor control and other applications Includes UART, I2C, and micro USB interfaces for versatile connectivity

DFRobot DC to DC USB Fast Charging Module 6~32V to 5V/3A The DFRobot DC to DC USB Fast Charging Module is a high-efficiency DC to DC converter that transforms 6–32V input into a stable 5V/3A USB output. Designed as a versatile USB fast charging module, it integrates smart charge recognition, making it compatible with over 99% of smartphones and USB-powered devices. This intelligent feature enables the module to deliver peak charging current, dramatically reducing charge time. With consistent voltage output, this 5V 3A power module is ideal for mobile fast charging projects, DIY power supplies, car charging retrofits, and solar charging systems. Diagram Features Small in size, easy to integrate into compact projects Supports multiple fast-charging protocols for wide device compatibility Provides stable USB output for reliable performance Can function as both a charging module and a power supply unit

DFRobot Embedded Serial to Ethernet Module based on ESP32 Series The Embedded Serial to Ethernet Module is a versatile gateway based on the powerful ESP32 series that simplifies connecting your serial devices to networks. This module comes with an optimized TCP/IP protocol stack that makes it easy to add networking capabilities to your embedded projects while saving development time and costs. The heart of this module is the ESP32 system-on-chip that combines 2.4GHz WiFi and Bluetooth dual-mode connectivity with exceptional performance, stability, and remarkably low power consumption. Whether you're a student working on an IoT project or a shop owner looking to offer smart connectivity solutions, this module provides an accessible way to bridge traditional serial devices with modern networking. This IoT communication module offers impressive versatility with four working modes (TCP Server, TCP Client, UDP Server, and UDP Client) and supports six different data transparent transmission modes. It allows you to create powerful connections between serial ports, WiFi, Ethernet, and Bluetooth interfaces in various combinations. The module excels in practical applications like smart agriculture, where it can collect and transmit data from sensors measuring air temperature, humidity, soil conditions, pH values, and carbon dioxide levels directly to a server. With its abundant IO ports, the module can also control ventilation and heating equipment based on temperature readings. This makes it an ideal solution for anyone looking to implement ESP32 gateway functionality in IoT scenarios without dealing with complex networking protocols. Note: The applicable temperature of the product is -20°C~+70°C Features Based on ESP32 series with integrated 2.4GHz WiFi and Bluetooth dual-mode Supports four working modes: TCP Server, TCP Client, UDP Server, and UDP Client Offers six different data transparent transmission modes for flexible connectivity Connects to the Internet or local networks through router with TCP/UDP connections Collects and transmits data from various environmental sensors to servers Provides abundant IO ports for temperature monitoring and equipment control Operates reliably in temperature range from -20°C to +70°C

DFRobot Fermion MEMS Methane CH4 Gas Sensor (Breakout, 1-10000ppm) The DFRobot Fermion MEMS Methane CH4 Gas Sensor is a compact and energy-efficient breakout board designed to detect methane concentrations from 1 to 10,000ppm. Powered by advanced MEMS technology, it features ultra-low power consumption (<20mA), minimal heat generation, and a fast response time. Its small size (13x13x2.5mm) makes it perfect for integration into gas leak detectors, safety systems, and environmental monitoring devices. Ideal for fire prevention and combustible gas detection, this sensor is part of a versatile MEMS series supporting multiple gas types for customizable sensing solutions. DFRobot Methane CH4 Gas Sensor Interfacing with Arduino Circuit Diagram Precautions for Use Remove the protective film before using the sensor. Avoid exposure to volatile silicon compounds (e.g., silicone adhesives, hair gels, silicone rubber). Do not expose the sensor to high concentrations of corrosive gases (e.g., H?S, SO?, Cl?, HCl). Prevent contamination from alkalis, alkali metal salts, and halogens. Avoid prolonged exposure to extreme environments (high temperature, humidity, or pollution). Keep the sensor away from water, condensation, and freezing conditions. Minimize mechanical stress—avoid strong vibration, impact, or dropping. Do not use this sensor in systems where failure could affect personal safety. If unused for a long time, preheat the sensor for at least 24 hours before reuse. Features Compact size: only 13 × 13 × 2.5mm, ideal for space-constrained applications Low power consumption: operating current less than 20mA High sensitivity with fast response and quick recovery time Built using advanced MEMS (Micro-Electromechanical Systems) technology Applications Health applications Fire detection Industrial safety Environmental monitoring Indoor air quality

DFRobot Fermion Serial Data Logger V2.0 for Arduino The Fermion Serial Data Logger V2.0 is an upgraded version of the original data logger that makes storing Arduino data simpler than ever before. Unlike previous MicroSD card modules, this compact device allows you to print data directly through the serial port without writing additional code, making it perfect for students and hobbyists working on data collection projects. The logger supports TF cards up to 32GB capacity, providing enough space for long-term data storage in applications like environmental monitoring, robot debugging, or any project requiring offline data collection. With its built-in USB functionality, you can easily connect the module directly to your computer to access stored files without needing a separate card reader. This versatile microcontroller logging shield features an onboard LED indicator that visually shows when data is being written or when a new file is being created, helping you confirm that your system is working properly. The dedicated SAVE pin makes it easy to organize your data by allowing you to trigger the creation of new files at specific intervals or events. Operating across a wide temperature range from -30°C to 85°C, this TF card data logger is suitable for both indoor and outdoor projects. The module works with supply voltages from 3.3V to 5V, making it compatible with Arduino and many other microcontroller platforms. Whether you're building a weather station, monitoring plant growth, or debugging a drone, this data logger provides a simple and reliable way to capture and store your valuable data. The upgraded V2.0 version compared to V1.0 version: Supports storage in TXT and CSV file formats. Significantly improves startup time and runtime stability. Supports scheduled creation of files for more flexible storage. Added USB port to make reading files more convenient. Features Supports FAT32 file system with compatibility for TF cards up to 32GB Built-in USB 2.0 interface eliminates the need for separate card readers Visual LED indicator shows data writing status for easy monitoring Operates with supply voltage range from 3.3V to 5V for broad compatibility Low operating current of only 23mA for efficient power usage Functions across wide temperature range from -30°C to 85°C Compact dimensions of just 23.5×22.5mm for easy integration into projects DFRobot Fermion Serial Data Logger V2.0 with Arduino Connection Diagram Applications Offline data collection Capture product debug logs Robots and drones debug

DFRobot Fermion VL6180X ToF Distance Ranging Sensor (Breakout) with Header The Fermion VL6180X ToF Distance Ranging Sensor is a high-precision measurement tool that uses advanced Time-of-Flight technology to detect distances from 5mm to 100mm with millimeter accuracy. Unlike traditional infrared sensors that can be affected by object color or reflectivity, this sensor measures the actual time taken for light to travel to the target and back, providing consistent readings in various lighting conditions. The compact breakout board comes fully assembled with voltage regulation, I2C level shifting, and easy-to-use pin headers, making it perfect for students and hobbyists working on robotics, smart devices, or automation projects. This versatile sensor combines distance measurement with ambient light sensing in one small package, opening up possibilities for many creative applications. The VL6180X communicates through a simple I2C interface, making it compatible with popular platforms like Arduino and Raspberry Pi. With its small size (20.5mm × 15.6mm), low power consumption, and ability to work accurately in changing environments, this sensor is an excellent choice for gesture detection, object presence sensing, and precise distance measurement in tight spaces. Whether you're building a line-following robot, a touchless switch, or a smart inventory system, this ToF sensor provides reliable measurements for your electronics projects. Features Detection range: 5mm to 100mm with millimeter-level accuracy Integrated ambient light sensor with adjustable sensitivity Operating voltage: 3.3V to 5V DC with onboard voltage regulation Communication: I2C interface (address 0x29 by default) Compact dimensions: 20.5mm × 15.6mm × 3.1mm Immune to target color and reflectivity variations Compatible with Arduino, Raspberry Pi, and other microcontroller platforms DFRobot Fermion VL6180X ToF Distance Ranging Sensor with Arduino Connection Diagram

DFRobot FireBeetle 2 ESP32 C6 IoT Development Board - Supports Wi-Fi 6, Bluetooth 5, Solar-Powered The DFRobot FireBeetle 2 ESP32 C6 IoT Development Board is a low-power controller designed around the ESP32-C6 chip, making it perfect for smart home projects. It features a high-performance 160MHz RISC-V 32-bit processor and supports multiple communication protocols, including Wi-Fi 6, Bluetooth 5, Zigbee 3.0, and Thread 1.3, ensuring seamless integration into various IoT networks. The development board offers several power supply options, such as Type-C, 5V DC, and solar charging for lithium batteries, managed by a solar power manager. This optimizes power usage and ensures efficient energy management, providing flexible choices for long-term deployment in IoT applications. Features Equipped with the ESP32-C6 chip, supporting communication protocols including Wi-Fi, BLE, Zigbee, and Thread. Supports Wi-Fi 6 for lower latency and reduced power consumption. Solar charging capability enables deployment without the need for power lines. Battery level detection for monitoring device battery status. Ultra-low power consumption with deep sleep mode at 16uA. Onboard GDI interface for easy connection to screens. Processor: RISC-V single-core processor. Wi-Fi Mode: Station, SoftAP, SoftAP+Station combined mode. Frame Aggregation: TX/RX A-MPDU, TX/RX A-MSDU. Bluetooth Protocol: Bluetooth 5, Bluetooth Mesh. Bluetooth Frequency: 125 Kbps, 500 Kbps, 1 Mbps, 2 Mbps. Compatible with IEEE 802.15.4-2015 protocol. Supports Thread 1.3 and Zigbee 3.0. Applications: Indoor Air Quality Monitoring. Indoor Ambient Light. Balcony Plant Soil Monitoring. Outdoor Weather Station.

DFRobot FireBeetle 2 ESP32-E IoT Microcontroller Board - Supports Wi-Fi & Bluetooth The FireBeetle 2 ESP32-E IoT development board is an advanced ESP-WROOM-32E-based main controller featuring dual-core chips designed specifically for Internet of Things applications. This powerful yet energy-efficient ESP32 WiFi module supports both WiFi and Bluetooth dual-mode communication, making it incredibly versatile for a wide range of connected projects. With its compact size, ultra-low power consumption, onboard charging circuit, and user-friendly interface, this microcontroller is perfect for smart home IoT, industrial applications, and wearable devices. The board can be easily integrated with popular IoT platforms like IFTTT, allowing you to create your own smart home system without complicated setup procedures. What sets the FireBeetle 2 ESP32-E Bluetooth microcontroller apart is its exceptional balance of performance and power efficiency. The board features a Tensilica LX6 dual-core processor running at 240MHz with 520KB SRAM and 32Mbit Flash memory, providing ample processing power and storage for sophisticated applications. The low power ESP32 design achieves just 10?A power consumption in deep sleep mode, making it ideal for battery-powered projects. Programming is straightforward with Arduino IDE support, and the board will soon support Scratch graphical programming and MicroPython. With thousands of compatible sensors featuring welding-free Gravity interfaces, getting started is simple even for beginners. The stamp hole design allows for easy embedding into your PCB, saving both time and money when building and testing prototypes. Features ESP32 dual-core processor with main frequency of 240MHz Ultra-low power consumption of just 10?A in deep sleep mode for extended battery life. WiFi+Bluetooth 4.0 dual-mode module supporting 802.11 b/g/n/d/e/i/k/r protocols. Onboard charging circuit and PH2.0 lithium battery interface with USB charging support. GDI Display Port for easy connection to compatible screens. Digital I/O x10, Analog Input x5, SPI x1, IIC x1, I2S x1 (Arduino default). Compact size of 25.4mm × 60mm Pinout

DFRobot Gravity 7/24 Industrial Analog pH Meter Kit for Arduino & Raspberry Pi Project The Gravity: 7/24 Industrial Analog pH Meter Kit (SEN0169-V2) is a professional-grade water quality monitor designed for continuous, real-time pH measurement in demanding environments. This upgraded version significantly improves precision and user experience compared to its predecessor. The kit includes an industrial-grade pH probe that supports 24/7 monitoring with a lifespan exceeding 4380 hours, ensuring consistent performance even in harsh conditions. The onboard voltage regulator chip supports a wide voltage supply range of 3.3V to 5.5V, making this industrial pH sensor compatible with both 5V and 3.3V main control boards such as Arduino, Raspberry Pi, and LattePanda. Its hardware-filtered output signal delivers low jitter for stable readings. What sets this Arduino pH meter apart is its exceptional accuracy of ±0.1 pH at 25°C and user-friendly calibration process. The software library adopts a two-point calibration method that can automatically identify standard buffer solutions (4.0 and 7.0), making the setup process simple and convenient. The industrial pH combination electrode features a sensitive glass membrane with low impedance, providing fast response times and good thermal stability. With its linear output voltage across the 0 to 14 pH range and excellent anti-pollution performance, this continuous pH measurement system is ideal for long-term online detection in applications such as aquaponics, aquaculture, chemical monitoring, and environmental water testing. Features Supports 24/7 continuous monitoring with lifespan exceeding 4380 hours. High measurement accuracy of ±0.1 pH at 25°C for precise readings. Two-point calibration using standard buffer solutions (4.0 and 7.0). Wide operating voltage range of 3.3V to 5.5V for versatile compatibility. BNC connector and Gravity interface for easy plug-and-play setup. Industrial pH probe with sensitive glass membrane and low impedance. Measurement range of 0 to 14 pH for comprehensive testing capabilities. DFRobot Gravity 7/24 Industrial Analog pH Meter with Arduino Connection Diagram Important Notes: Keep the BNC connector and signal conversion board dry and clean. Moisture can lower the input impedance, causing inaccurate readings. If damp, dry them before use. Do not place the signal conversion board on wet or conductive surfaces. This may affect accuracy. Use nylon standoffs to mount it, maintaining a gap between the board and the surface. The glass tip of the pH probe is delicate. Avoid contact with hard surfaces. Scratches or cracks can damage the probe. After use, disconnect the pH probe from the signal board. Do not leave it connected when the board is powered off for long periods. The probe cap contains protective liquid (3.3mol/L KCL). Some leakage and white crystal formation around the cap is normal. As long as there’s still liquid inside, the probe will remain accurate. You can return the crystals to the cap if needed.