4 Independent Buttons Keyboard Module Key benefits Simple ready to use input module for student classroom projects, graduation projects, and laboratory experiments. Sturdy double sided PCB construction for reliable mounting and long term use. Large heat dissipation area and stable electrical behavior for continuous operation during testing and development. Carefully debugged amp circuit and optimized component layout to reduce interference and improve signal conversion performance. Main functions and specifications Function: 4 independent pushbutton inputs for digital signal entry and human machine interface testing. PCB: 1.6 mm thick double sided board for mechanical strength and reliable solder connections. Circuit: Amplifier circuit has been repeatedly debugged to ensure reasonable component placement and lower interference. Performance: Stable response suitable for prolonged experimental use and classroom demonstration. Compatibility and applications Designed for use with common microcontroller development boards and digital input systems in educational and prototyping environments. Works well as an interface module in electronic lab benches, control panel mockups, and student design projects. Practical usage scenarios Classroom experiment: Connect to a microcontroller or data acquisition board for button input lessons, timing tests, and debounce algorithm exercises. Graduation project: Use as a reliable front end for a student built control system, human machine interface prototype, or interactive demonstration. Prototyping and testing: Integrate into a small control panel for functional testing of firmware, input filtering, or signal conversion routines. Why choose this module Built for education and experimentation with focus on durability and stable electrical performance. Clear, modular design that simplifies wiring, testing, and replacement during iterative development. Reduced interference and improved conversion behavior thanks to an optimized amplifier circuit and component layout. Package notes Module contains four independent buttons mounted on a 1.6 mm double sided PCB. Suitable for bench testing, lab exercises, and integration into student projects requiring reliable button inputs.