Magnetic Terrain Tiles — How the Technology Works

The question we get asked most often about Glowrune's tile system is: "How do you get power to every tile without any wires?" The answer is pogo-pin magnetic connectors — a technology borrowed from industrial and medical device manufacturing and adapted for consumer terrain tiles for the first time. This article explains how it works.

The Problem with Wired LED Terrain

To understand why magnetic electrical connectors matter, it's worth understanding the problem they solve. Any LED terrain system that doesn't use them faces a fundamental challenge: how do you power LEDs in multiple tiles that reconfigure into different layouts each session?

The obvious answer is wires. Run a power cable to each tile. This approach works — many maker-community LED terrain setups use it — but it creates practical problems that compound as the system scales:

• Cable management: 15 tiles with individual power leads produces 15 cables on the table. Routing them out of sight without obscuring the terrain is a significant challenge.
• Reconfiguration friction: Every time you change the dungeon layout, you have to disconnect and reconnect individual tile cables. What should be a 3-minute setup becomes a 15-minute cable-management exercise.
• Accidental disconnection: Cables snagged by sleeves, knocked by miniatures, pulled by enthusiastic players — mid-session tile disconnections are common in wired setups.
• Failure points: Each cable-to-tile connection is a potential failure point. The more connections, the more opportunities for something to stop working mid-session.

Glowrune's connector system eliminates all of these problems. No cables between tiles. No connections to make or break when reconfiguring. No accidental disconnections. A tile placed adjacent to another tile connects automatically — both mechanically and electrically.

How Pogo-Pin Connectors Work

A pogo pin is a spring-loaded cylindrical contact pin. The "pogo" name comes from the pin's spring mechanism: the pin compresses under load and springs back when the load is removed, like a tiny pogo stick.

The anatomy of a pogo pin connector pair:

• Plunger: The spring-loaded pin that extends from the connector housing. When compressed against a mating surface, it makes electrical contact.
• Barrel: The housing that contains the spring mechanism. Mounted in the tile edge during manufacturing.
• Mating contact: A flat pad or cup on the opposing tile that the pogo pin contacts when compressed.

Pogo pins are used extensively in industrial applications where repeated, reliable connections are required without traditional plugs and sockets: laptop docking stations, medical equipment charging contacts, automated test equipment, and — increasingly — consumer electronics like some wireless earbuds and smartwatches use pogo-pin charging contacts.

The key properties that make pogo pins right for terrain tiles: they're rated for tens of thousands of connect-disconnect cycles, they self-clean on contact (the spring action wipes the contact surface), and they maintain connection under vibration because the spring keeps them in constant compression.

How Neodymium Magnets Work Alongside the Pogo Pins

Pogo pins require compression to work — the pin must be pressed against its mating contact with enough force to maintain reliable conductivity. This is where the N52 neodymium magnets play their role.

N52 is the highest commercially produced grade of neodymium magnet. N-grade neodymium magnets are a rare-earth magnet type with exceptionally high field strength relative to physical size — an N52 magnet roughly the size of a small coin can exert multiple kilograms of pull force.

In Glowrune's connector design:

1. Alignment: As two tiles approach each other, the neodymium magnets attract and automatically guide the tile edges into precise registration — the pogo pins align with their mating contacts without the user needing to manually position them.
2. Compression: Once tiles are in contact, the magnetic pull force holds the pogo pins compressed against their contacts. This compression is the force that maintains electrical conductivity — the magnets are, in effect, providing the contact pressure that pogo pins need to work reliably.
3. Hold: During play, the magnetic hold force keeps tiles from separating under the kind of normal table activity that would shift loose tiles — bumps, miniature movement, leaning players.

The magnets don't carry current — they're structural. The pogo pins carry current. But the magnets are what make the pogo pins work reliably in a consumer product that gets assembled and disassembled repeatedly.

What Flows Through the Connectors: Power and Data

Glowrune tiles have three electrical functions that need to communicate between tiles: 12V power (positive), ground reference, and the LED data signal. The pogo-pin connector on each tile edge carries all three:

• 12V power pin: Carries the supply voltage from the controller tile to all connected tiles. The controller tile is the one connected to the 12V adapter; all other tiles receive power through the magnetic connector chain.
• Ground pin: Common ground reference for all tiles in the connected array.
• Data pin: Carries the SK6812 RGBW serial data signal from the controller tile to each tile's LED driver. Because each tile is addressable, the data signal carries color commands for every LED in the array — each tile reads its LED commands and passes the remaining signal to the next tile.

This three-pin architecture means that a single connector edge carries everything needed for a tile to receive power and display its assigned LED animation — no secondary connections, no separate data cables, no synchronization hardware.

How Power Distributes Across a Multi-Tile Array

A natural question: if power enters through one tile (the controller), how does it reach tiles on the other side of a 15-tile array?

The answer is a distributed bus architecture. Each tile has connector pins on multiple edges (for square tiles: all four edges; for hex tiles: all six edges). Power and ground are connected to all edges simultaneously, meaning every connected tile is electrically parallel to every other tile — not in series. In a parallel power distribution, the full 12V supply voltage is available at every tile regardless of how far that tile is from the controller.

This is important for LED brightness uniformity: in a series power chain, voltage drops across each tile, meaning distant tiles receive lower voltage and appear dimmer. In Glowrune's parallel bus, every tile receives the same 12V supply, so LED brightness is uniform across the entire map regardless of array size.

The Data Signal Path

Unlike power, the LED data signal does travel in series through the array. The SK6812 protocol works by "daisy-chaining" — the controller tile sends the full data stream for all LEDs in order; each tile reads the first N values (where N is the number of LEDs in that tile), then passes the remaining values downstream to the next tile.

In practice, the controller tile knows the array topology from the app's map configuration. When you tell the app your map is a 3×5 rectangle of square tiles, the controller generates the correct data stream for 225 total LEDs (15 tiles × 15 LEDs per tile for square tiles), addressed in the correct order to match the physical layout.

This topology-aware approach is why the Glowrune app lets you design your map layout before playing — the app needs to know the physical arrangement to generate the right addressing sequence for per-tile animations. Full technical overview →

Mechanical vs. Electrical Magnetic Connectors: The State of the Market

Magnetic terrain tile connectors are not new. Some premium 3D sculpted terrain manufacturers have introduced magnetic alignment connectors in recent editions — mechanical magnets that click pieces together for alignment. Several 3D-printing communities have designed magnetic connector inserts for DIY terrain.

What is new — and what no other consumer terrain product has previously done — is combining the magnetic alignment with electrical power transfer. Every prior magnetic terrain connector system is mechanical-only: the magnets align the pieces, but no electrical connection is made. Adding LEDs to mechanically-magnetic terrain still requires separate wiring.

Glowrune's pogo-pin electrical magnetic connector is the first consumer terrain tile implementation where snapping tiles together completes the electrical circuit. The same gesture that mechanically joins two tiles also connects them electrically, powering LEDs and propagating the data signal — with no separate wiring step required.