EJ.0006 - A programmable USB keyboard for PC

Project Description:

this project is a compact 3x3 programmable keypad based on an Arduino-compatible microcontroller.
It allows the user to assign custom functions or keyboard shortcuts to each button, making repetitive tasks faster and more efficient.

🔧 Components:

• Arduino Pro Micro (ATmega32U4)

• 9x momentary push buttons (tactile switches)

• PCB (custom designed)

• Pull-up resistors (internal, no external components required)

• USB connection (for power and communication)

• 3D printed enclosure

• Self-tapping screws (M2.2, button head, Phillips drive)

🎯 Goal

The goal of this project is to design and build a fully programmable keypad while learning key concepts in embedded systems and electronics.

In particular, this project aims to:

• Develop a scalable matrix scanning system for keyboard input

• Gain hands-on experience with Arduino firmware and USB HID communication

• Create a flexible and customizable input device for real-world applications

• Understand the interaction between hardware (PCB, switches) and software (firmware)

Assembly: 

Follow the exploded view as a reference for the assembly.

Use the specified screws together with the spacer provided in the 3D files (not shown in the exploded view) to properly secure the PCB in place.

The spacer is not required for the screws used to fix the rear support of the enclosure.

Finally, apply the rubber feet to the bottom of the case (also not shown in the exploded view) to ensure stability and prevent slipping.

📖 You can find all the instructions and explenation about how it works here:

https://www.electronicjourney.blog/post/ej-0006-un-tastierino-usb-per-pc-programmabile