Dynamic Keycards

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# Dynamic Keycards Redstone, but with a guest list. Dynamic Keycards adds keycards and card readers to your world — a compact way to put an ID check in front of your redstone. Place a reader and it binds to you. Register a blank card on it and the card becomes a keyed keycard; from then on, that card makes the reader emit a redstone signal. Everyone else gets a denied light. ## Supported versions - NeoForge 1. 21. 1 — available now - Fabric support and more game versions are planned ## Devices ### Card Readers Five styles to match your build: Insert, Swipe, Touch, Advanced, and Obsidian. They behave identically — only the looks and the recipe cost differ — and mount on floors, walls, and ceilings just like buttons. The Obsidian reader matches obsidian's hardness and blast resistance — diamond pickaxe required. The status lights show what a reader is doing: off when idle, green for accepted, red for denied, and a blinking display while register mode is armed. A registered card fires a redstone signal at full strength — 3 seconds by default, adjustable from the reader's settings screen on a sliding scale in ticks, seconds, or minutes. A reader binds to the player who placed it — nobody else can register cards on it. In register mode, one press always toggles exactly the card you're holding: accepted cards get removed, rejected cards get registered. Copies of that card are never affected. Readers can also be linked to each other: hold an unplaced reader, right-click one that's in register mode, then place it. A card registered anywhere in a linked group is accepted at every reader in it — chain them, star them, link as many as you like — and a card removed anywhere is blocked everywhere. Handy for a front and back door that should always agree. Everything else stays independent: owner, mode, frequency, signal length. Sneaking with your own keycard cuts an accept signal short and drops straight into register mode, so you don't have to wait out the door you just opened. That's the only thing sneaking is needed for — registering cards and tuning connections work either way. ### Card Duplicator Need five cards that open the same door? The Card Duplicator copies a card onto a blank one: sneak-click it with the source card, then with a blank. The copy inherits everything the source could open at that moment — afterwards the two are fully independent cards, so removing one never locks out the other. No owner, no redstone output. Colors are kept, so differently colored cards can share access. ### Sensors Wall- and ceiling-mounted proximity sensors, in a plain and an advanced tier. They watch their own cell and the one below for living entities and hold a redstone signal for as long as something's there — continuous, not a fixed burst like a reader's — with a release delay you can set down to zero. No ownership, so anyone can adjust or move one. The advanced tier's detection range is yours to shape. Right-click it with redstone dust and a red-edged box appears; Ctrl+scroll toward any face to push or pull that side a cell at a time, then right-click to commit. The full reach is a 3×3×3 volume — hanging below a ceiling sensor, or projecting out and down from a wall one — and any smaller box inside that works too. The advanced tier can be bound to a card reader: hold one, right-click the reader, and place it. From then on, anyone walking past carrying a card that reader accepts — anywhere in their inventory, not just in hand — triggers the reader remotely, sound and lights and all. Automatic doors that still check ID. A bound sensor picks how the two share the signal: the reader alone, both at once on the reader's own timing, or both on the sensor's. The same gesture binds one advanced sensor to another instead, and the two drive each other — one connection per sensor, so aiming at something already bound is refused rather than quietly rewired. Advanced sensors also take dye, all 16 colors, with a gold nugget to strip it back. ### Transmitter & Receiver A pair that carries a redstone signal across any distance without wiring between them. A transmitter broadcasts whatever wired signal reaches it. In mixed mode it can also be triggered by hand: one right-click sends a signal that runs for a length you set. A receiver turns that back into its own output somewhere else entirely: Pulse mirrors the source live with an optional release delay, Toggle flips on at each trigger and stays on until the next. Full 0–15 strength survives the trip, so comparators work on the far side. A receiver doesn't need a transmitter, either — it can take a card reader or an advanced sensor as its source directly, putting an accept signal anywhere in the world. Binding works as it does everywhere else here: hold the unplaced receiver, right-click the source