The 4×4 Membrane Keypad is a compact 16-key matrix input device featuring numeric keys 0–9, A–D function keys, and * and # keys. It uses an 8-pin row and column interface for easy connection with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, PIC, AVR, and other microcontrollers. Its thin, flexible design and self-adhesive backing make it ideal for password locks, access control, robotics, automation, menu navigation, and embedded electronics projects.

The 3-6V 400KV High Voltage Generator Boost Module converts a low 3V to 6V DC input into a high-voltage pulse output using an internal boost circuit. Its compact size and simple two-wire input make it suitable for high-voltage experiments, scientific demonstrations, ignition systems, and educational electronics projects. The module requires only a suitable DC power supply and switch for operation.

Warning: This module generates extremely high voltage and should only be handled by experienced users following appropriate electrical safety precautions.

The MAX7219 8×8 LED Dot Matrix Module is an SPI-controlled LED display module featuring an 8×8 common cathode LED matrix driven by the MAX7219 display driver IC. It requires only three microcontroller pins for communication and supports cascading multiple modules to create larger scrolling text and animation displays. Ideal for Arduino, ESP32, STM32, Raspberry Pi, clocks, counters, message displays, and DIY electronics projects.

16-channel bidirectional analog and digital multiplexer module for connecting multiple sensors or signals using only four select pins and one signal pin.

High-power DC-DC buck converter utilizing the XL4016E1 chip to deliver up to 96% efficiency. Supports a wide 8-36V input and adjustable 1.25-35V output for high-current applications.

High-efficiency 4S lithium-ion battery charger with a USB Type-C input. Features 16.8V/2A output, automatic cell balancing, and overcharge protection for 4-cell 18650 battery packs.

High-speed Li-Fi data transfer kit using Visible Light Communication (VLC). Supports 8–10 feet range at 9600 baud.