18650 Battery Holder V3 Development Board 4-Cell Module Compatible with Raspberry Pi 3 This 4-cell 18650 Battery Holder V3 Development Board is designed to turn standard 18650 Li-ion cells into a reliable and portable power source for your projects. \With built-in overcharge, overvoltage, undervoltage, and overcurrent protection, it ensures safe and stable performance at all times. The board supports both 5V/3A and 3V/1A output modes, allowing you to power a range of electronics with confidence. Whether you’re building portable devices, IoT setups, or field-deployable prototypes, this module offers excellent versatility. It includes a micro-USB charging port, efficient power conversion (up to 95%), and a convenient voltage switching button. The board is fully compatible with Raspberry Pi 3, making it a dependable choice for makers, developers, and hobbyists working on power-independent applications. Features: Supports dual voltage outputs, 5V/3A for high-power devices and 3V/1A for low-power circuits, making it suitable for a wide range of electronics. Includes a built-in lithium battery protection IC, offering overcharge, overvoltage, undervoltage, and overcurrent protection for safe operation. Offers high conversion efficiency up to 95%, ensuring stable and optimized power performance. Features a micro-USB charging input with a charging current of 600mA–800mA for efficient battery recharge. Designed to hold up to two 18650 batteries, with clear polarity markings to prevent installation errors. Equipped with a voltage switching button for easy toggling between 3V and 5V outputs. Fully compatible with Raspberry Pi 3, making it ideal for portable Pi projects, DIY electronics, and embedded applications.

18650 Battery Spacer Bracket – 1x3 Cell Holder for Lithium Battery Pack Assembly The 18650 Battery Spacer Bracket is a reliable and sturdy solution for securely fixing and organizing lithium battery cells in battery pack assemblies. Made from high-quality ABS+PC material, it offers excellent durability and insulation properties, ensuring your batteries remain stable, protected, and safely spaced during use. This 1x3 configuration bracket is designed for versatility and is widely used in high-power battery packs, including electric vehicles, solar street lamps, and military applications. Its lightweight and compact design make it easy to integrate into different setups while maintaining strong support and thermal isolation for optimal battery performance. Features: Provides secure and stable positioning for 18650 lithium battery cells. Made from high-strength ABS+PC material for durability and heat resistance. Ensures electrical isolation and physical protection between battery cells. Lightweight design (approx. 0.01kg) for easy integration in compact setups. Ideal for assembling battery packs in EVs, solar lighting, and industrial equipment. Snap-fit design allows easy assembly and expansion for custom battery configurations. Suitable for both professional and DIY battery pack building projects.

24V/12V to 5V 5A Power Module – DC-DC XY-3606 Step-Down Converter with USB Fast Charging The 24V/12V to 5V 5A DC-DC XY-3606 Power Module is a high-efficiency step-down converter designed to deliver a stable 5V output for a wide range of electronic and automotive applications. It features a synchronous rectification design that allows for wide voltage input (9V–36V), ensuring efficient and reliable power conversion even under high loads. Whether you’re powering embedded systems, IoT devices, or fast-charging mobile phones, this module provides consistent performance and excellent stability. Built with convenience and safety in mind, the module comes with both DC terminals and a USB output port equipped with a fast-charge identification chip compatible with Android and iPhone devices. Its compact and lightweight design makes it easy to integrate into DIY projects, vehicle setups, or industrial automation systems where regulated 5V power is needed. With a solid output current capacity of up to 5A and advanced protection features, it’s an ideal choice for both hobbyists and professionals. Features: Wide input voltage range of 9V–36V for versatile power compatibility. Delivers up to 5A output current with high efficiency and low heat generation. Equipped with a USB port featuring fast-charge identification for Android and iPhone devices. Includes both DC plug and terminal connectors for easy installation and use. Built on a synchronous rectification scheme for improved performance and reliability. Compact design ideal for use in automotive, industrial, and DIY electronic applications. Provides stable 5V output suitable for powering microcontrollers, sensors, and embedded systems.

5A Constant Current & Constant Voltage LED Driver – Adjustable Li-ion Battery Charging Module This 5A Constant Current and Constant Voltage LED Driver & Li-ion Battery Charging Module is designed for makers, hobbyists, and professionals who need a reliable and adjustable power control solution. Built as an efficient step-down (buck) converter, it allows you to fine-tune the output using onboard adjustable potentiometers. You can precisely set the output voltage and current, making it ideal for LED driving, battery charging, and various DIY power applications. The module also supports communication with a computer using TTL-level output, and with the help of a USB-to-TTL converter (like CP2102), you can easily read live voltage and current data. With accurate measurement (0.1%), low operating current, and stable performance across a wide voltage range, this module is a dependable tool for safe Li-ion charging, LED control, and regulated power supply projects. Features: Offers precise 0.1% measurement accuracy, ensuring reliable voltage and current readings. Adjustable constant current (0–5A) and constant voltage (5–30V) output using onboard potentiometers. Supports TTL communication, allowing live voltage and current monitoring via PC using a USB-to-TTL converter. Low operating current (<15mA) and works efficiently with a voltage differential as low as 1V. Includes bright red digital display, making monitoring easy even in low-light conditions. Suitable for both Li-ion battery charging and constant-current LED driving applications. Durable design with operational temperature range of –10°C to +65°C.

9V Battery Case with DC Jack The 9V Battery Holder with DC Jack is a durable and convenient power supply accessory designed for various DIY electronics and IoT applications. It securely holds a single 9V battery, providing a stable connection through a 5.5mm outer and 2.1mm inner diameter DC barrel jack. Made from high-quality polypropylene with nickel-plated contacts, it ensures corrosion resistance and long-lasting performance. The integrated cable measures 100mm, offering flexibility for easy integration into your projects. Ideal for powering GPS modules, Bluetooth speakers, Arduino boards, and small embedded systems, this battery holder offers a safe and compact power solution. The design includes three mounting holes for secure attachment, preventing the battery from hanging loose during operation. Whether you're building a prototype or upgrading an existing setup, this holder provides a neat and reliable way to manage your 9V power supply. Features: Designed to hold one 9V battery securely in place for stable power output. Equipped with a 5.5mm x 2.1mm DC barrel jack (center-positive) for quick connection. Constructed from durable black polypropylene with nickel-plated terminals for corrosion resistance. Includes three mounting holes for firm installation in enclosures or devices. 100mm cable length allows easy placement and flexibility during assembly. Ideal for DIY electronics, Arduino, IoT projects, Bluetooth speakers, and power banks. Compact and lightweight design makes it perfect for portable applications.

GSR Skin Current Sensor Module for Human Emotional Activity The GSR Skin Current Sensor Module for Human Emotional Activity measures the galvanic skin response (GSR), which reflects changes in the skin’s electrical conductance caused by emotional or psychological arousal. When a person experiences stress, excitement, or other strong emotions, the sympathetic nervous system activates the sweat glands, increasing skin conductivity. This GSR sensor module detects those variations, making it an excellent tool for emotion-related experiments such as lie detection, relaxation training, and sleep quality monitoring. It’s a simple and effective way to explore the connection between human emotions and physiological responses. Features: Detects emotional responses through skin conductivity. Compact and easy-to-integrate GSR sensor module. Uses two electrodes attached to the fingers. Suitable for biofeedback, emotion research, and educational projects. Can be used in lie detector and sleep monitoring applications.

LilyPad CR2032 Coin Cell Battery Holder The LilyPad Coin Cell Battery Holder CR2032 is a compact and user-friendly power module designed for wearable and e-textile projects. It securely holds a 20mm coin cell battery and features an integrated slide switch, allowing you to easily power on or off your creation without removing the battery. Made with a durable purple PCB, this module offers a reliable and stylish way to supply power to your LilyPad circuits or other small electronics.Perfect for DIY enthusiasts, fashion tech designers, and students, this battery holder provides four sewing connection points (two positive and two negative) for seamless integration into fabric-based circuits. Its sturdy design prevents accidental disconnection and ensures stable performance, making it an essential component for powering light-up clothing, interactive accessories, and creative electronics projects. Features: Designed to hold a single CR2032 coin cell battery securely. Built-in slide switch for convenient power control. Four sewing tabs (two positive, two negative) for easy stitching into fabric projects. Compact and lightweight design ideal for wearables and e-textiles. Strengthened battery connector prevents accidental pop-out. Durable purple PCB ensures long-lasting reliability. Perfect for powering LilyPad Arduino circuits and small electronic modules.

MB20 – 11mm PCB Mounting CT Buzzer (12V) The MB20 – 11mm PCB Mounting CT Buzzer is a compact, reliable, and easy-to-integrate audio indicator designed for a wide range of electronic circuits. Operating at 12V with a clear continuous tone, this buzzer offers stable performance for alarms, notifications, safety indicators, and embedded systems. Its compact 11mm pitch makes it ideal for tight PCB layouts, while its sturdy construction ensures long-term durability. Built for consistent sound quality, the MB20 delivers a loud output of 85 dB with a stable 4 KHz frequency, making it suitable for consumer electronics, home appliances, DIY projects, and industrial equipment. With low power consumption, a wide 1.5–27V operating range, and simple PCB mounting, this buzzer is an excellent choice for engineers and hobbyists building audio alert systems. Features: Compact 11mm pitch design fits easily into small PCB spaces. Produces a loud 85 dB continuous tone suitable for clear audible alerts. Wide operating voltage range of 1.5V to 27V, offering flexibility for multiple circuits. Durable ABS housing ensures long-lasting performance in various environments. Low current consumption (max 15 mA) for efficient operation in battery-powered devices. Easy-to-mount PCB design with 8mm lead length for quick installation.

SmartElex 3.3V 5A Buck Converter Module – TPS565201DDCR The SmartElex 3.3V 5A Buck Converter Module is a compact and efficient DC-DC step-down power supply designed to deliver stable voltage for your electronic projects. Built using the TPS565201DDCR chip, it converts higher input voltages into a steady 3.3V output with excellent efficiency and low heat generation. This buck converter module is ideal for powering microcontrollers, sensors, and embedded systems that require a clean and reliable 3.3V supply. It supports input voltages up to 17V and provides up to 5A of continuous current, making it perfect for Arduino, Raspberry Pi, and other DIY electronics or IoT projects. With its high efficiency, small size, and simple plug-and-play design, this DC-DC step-down converter board is an essential component for hobbyists, engineers, and makers looking for a durable and energy-efficient power regulation solution. Features: High-Efficiency Power Conversion: Based on the TPS565201DDCR chip, it efficiently converts higher DC input to a stable 3.3V output. Supports Up to 5A Output Current: Provides steady power for microcontrollers, sensors, and IoT devices that need reliable 3.3V supply. Wide Input Voltage Range: Works with input voltages from 4.5V to 17V, suitable for DC-DC step-down applications. Compact and Durable Design: Small in size but powerful, making it easy to integrate into embedded and DIY electronics projects. Low Heat Generation: Optimized for cool operation and consistent performance even under heavy load. Plug-and-Play Ready: Simple to connect and ideal for powering Arduino, Raspberry Pi, and other development boards.

SmartElex 4-Bit Bidirectional Voltage-Level Translator Breakout – TXB0104 Logic Converter Module The SmartElex 4-Bit Bidirectional Voltage-Level Translator Breakout is a compact and efficient module designed to safely connect devices that operate at different voltage levels. It helps your 3.3V and 5V logic circuits communicate smoothly without damaging any components. Powered by the reliable TXB0104 chip, this bidirectional voltage level translator automatically detects signal direction and adjusts accordingly, making it ideal for I2C, SPI, and UART communication between microcontrollers, sensors, and other digital devices. Perfect for Arduino, ESP32, and Raspberry Pi projects, this voltage level translator ensures safe and stable data exchange between mixed-voltage systems. Whether you’re building an IoT prototype or experimenting with embedded electronics, this breakout board simplifies your circuit design while ensuring reliable performance. Features: 4-Bit Signal Translation: Handles up to four data lines, allowing smooth voltage conversion between 3.3V and 5V devices. Automatic Direction Sensing: The TXB0104 chip detects signal direction automatically - no manual configuration needed. Bidirectional Compatibility: Works seamlessly for both input and output voltage translation between two logic levels. High-Speed Performance: Supports fast data transmission for I2C, SPI, UART, and other digital communication interfaces. Compact & Easy to Use: Small 4-bit bidirectional voltage-level translator breakout fits easily into any embedded or DIY project. Wide Application Range: Ideal for Arduino, ESP32, Raspberry Pi, and other microcontrollers in mixed-voltage circuits.