DIY Engineer Mounts FLIP Fluid Sim on Flip-Dot Display

Overview

DIY engineer and developer has successfully mounted a FLIP fluid simulation on a flip-dot electromechanical display, creating a unique intersection of computational fluid dynamics and vintage hardware. The project, completed for the EMF2026 festival, addresses a long-standing desire to add auditory feedback to visual fluid simulations by leveraging the inherent mechanical noise of flip-dot technology.

The term FLIP, standing for Fluid Implicit Particle, is central to the concept. While the primary motivation was technical exploration, the creator acknowledged that the phonetic similarity between "FLIP" fluid dynamics and "flip-dot" displays provided a compelling pun that sealed the project's feasibility.

Background and Hardware Sourcing

The Silence of Digital Fluids

For several years, the developer has been constructing various fluid simulations, including volumetric displays and interactive pendants. However, these projects shared a common deficit: the visual representation of liquid was entirely silent. The desire to simulate swishing water noises led to the realization that an electromechanical display could provide authentic audio feedback without additional sound hardware.

Flip-dot displays were identified as the ideal medium because each dot physically flips when energized, producing a distinct click. Unfortunately, acquiring such hardware presented significant financial barriers. With only one manufacturer still in existence and exclusive contracts with high-budget artistic studios like Breakfast Studio, costs often exceeded $50,000.

Acquiring Components

The path to sourcing panels involved leveraging community networks and hackercamp conversations. While there was talk of forming a collective to order new panels from China, the manufacturing complexity proved prohibitive for amateur developers. Flip-dot disks are intricate sandwiches of approximately six materials, utilizing permanent magnets and polarizable cores to maintain their state without power.

Contact was eventually established with Sam, known online as Look Mum No Computer, whose museum of obsolete technology occasionally receives donations of exotic electronics. Sam possessed a large collection of old flip-dot displays, likely reclaimed from buses or new-old-stock. Although many were in poor condition, he provided the developer with several panels to experiment with, contingent upon developing a more efficient driving method than existing solutions.

Technical Challenges and Circuit Design

Matrix Limitations

The primary technical hurdle involved the physical and electrical constraints of the salvaged panels. The circuit boards protrude from the edges, preventing seamless tiling in one direction. Furthermore, the original drive circuitry was inefficient, taking approximately one second to update the entire display due to the limitations of wiring the panel as a single large matrix.

Research indicated that while the physical flip of a dot takes about 60 milliseconds, the electrical pulse required to polarize the cores need only be as short as one millisecond. This insight allowed for faster scanning rates if higher voltages were used to shorten pulse widths.

Electronic Framework

The project required a custom framework to drive the dots effectively. The developer designed decoder boards and a robust power supply system capable of delivering the necessary voltage and current spikes. A joystick interface was integrated to allow real-time interaction with the simulation, enabling users to influence the fluid dynamics directly.

The motherboard and power bus were constructed to handle the matrix addressing scheme, where column lines are set to high or low states, and row lines are pulsed to flip specific dots. This approach significantly reduced update times compared to the original driver circuits, making real-time fluid simulation visually viable.

Implementation and Outcome

Simulation Integration

The FLIP fluid solver was adapted to output pixel states that corresponded to the flip-dot matrix. Each frame of the simulation translated into a series of electrical pulses sent to the decoder boards. The resulting display showed fluid moving across a grid of mechanical dots, accompanied by the characteristic clicking sounds of the hardware.

The resolution of the used panels, specifically a 13-by-28 configuration, presented a low-resolution canvas. However, the coarse pixelation added a distinct aesthetic quality to the simulation, emphasizing the retro-futuristic nature of the installation. The creator noted that the 13-column width was likely chosen by the original designers for prime-number affinity.

Community Impact and Future Prospects

The project was showcased at EMF2026, serving as both a technical demonstration and an artistic installation. By publishing the detailed build process, the developer hopes to encourage others to explore flip-dot technology. There is a pragmatic optimism that if the project inspires manufacturing interest in China, it could lead to cheaper, accessible flip-dot panels for the broader maker community.

"If, after publishing this, some company in China starts churning out cheap flipdot displays I think we'll call that a win."

The completion of this installation marks a significant step in repurposing obsolete display technology for modern computational art. It demonstrates that complex simulations can be rendered on limited hardware when paired with creative engineering and a willingness to dive into electromechanical details.