4-Key Keyboard Module - Universal Push Button Switch Board For DIY Electronics Projects DC 0-48V

About This Product

Hey DIY electronics enthusiasts, this 4-key keyboard module is seriously handy for all kinds of projects! Working with DC 0-48V, this little board gives you four common cathode push buttons that output low level when pressed - perfect for interfacing with all your favorite microcontrollers. The 2.54mm pin spacing means it plugs right into breadboards or connects easily to your Arduino, Raspberry Pi, STM32, PIC, or pretty much any MCU you're working with. At just 12.7x33mm (about 0.5x1.3 inches) and weighing only 3g, it's tiny enough for compact projects but built with quality components that ensure durability. I've used these for everything from custom game controllers to home automation systems - they're just so versatile! The four independent keys (K1-K2-K3-K4 with GND) give you multiple input options without needing separate components. Installation is straightforward - just connect the pins to your main board and you're good to go. The build quality is impressive for the price, with clean soldering and components that feel like they'll last through plenty of button presses. Whether you're building a custom MIDI controller, a security keypad, or just need some physical inputs for your prototype, this module saves you the hassle of wiring up individual buttons and resistors. It's one of those simple components that somehow ends up in half your projects once you realize how convenient it is. Perfect for beginners learning about digital inputs or experienced makers who just want reliable buttons without the DIY wiring headache.