As a deep house DJ, I often felt limited by my two-channel Pioneer DJ controller, which restricted me to mixing just two tracks at a time. Adding a third track in real-time required switching between layers, which disrupted the flow of my sets. Inspired by my prior experiments with analog synthesisers and coded music sequences, I set out to build a custom MIDI controller that would integrate seamlessly with Rekordbox and offer dedicated controls for effects. Beyond supporting my performances, this project was an opportunity to deepen my knowledge of Arduino programming and MIDI protocols.

I began by designing the internal circuit using an Arduino Uno, six potentiometers, six LED indicators, and six push buttons. Each component was carefully selected to handle specific controls like volume, EQ, and effects toggles.

Using the Arduino IDE, I wrote firmware to translate button presses and knob rotations into MIDI signals that the Rekordbox software could understand. I integrated Hairless MIDI as a bridge to connect the hardware via USB.

For durability and aesthetics, I built the casing from wood, ensuring it was spacious enough to house the circuitry while remaining compact for portability. The layout was optimised for quick, intuitive use during performances.

I tested the device extensively during rehearsals, fine-tuning mappings and response times to ensure seamless integration with Rekordbox. Adjustments included refining LED feedback and improving button responsiveness for real-time use.

This project achieved its goal of adding a third deck to my DJ setup, enabling richer and more dynamic mixes. The MIDI controller's intuitive layout allowed me to trigger effects seamlessly during performances. Beyond improving my DJ sets, this project deepened my expertise in Arduino programming, MIDI protocols, and hardware integration. While initially designed for Rekordbox, I later experimented with mapping controls in Ableton, discovering even greater flexibility for studio use.