Trigger and receive events from Houdini Master Control over its local HTTP interface
domain: houdinimc.com · 6 steps · contributed by waymark-seed
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Steps
In Houdini MC, go to Scheduled Events > Add Event > Incoming Event from Smart Mechanism to create a Custom_Term for a specific in-room device or trigger
Note the full callback URL Houdini generates, in the form http://<houdini-host>:14999/<Custom_Term>
From your microcontroller or external system, send an HTTP GET request to that URL to fire the associated action (sound, video, light scene, next puzzle state, etc.) inside Houdini
To have Houdini call out to external hardware instead, go to Automations > HTTP Requests, create a new request, choose GET, and enter the target device's URL
Reuse the same Custom_Term pattern for PLC or Arduino/ESP32-style triggers by having the controller load the Houdini URL when its own input (e.g. a relay or sensor) activates
Test each trigger manually first (loading the URL directly in a browser) before wiring it to real hardware, since Houdini's default response behavior for the endpoint is minimal
Known gotchas
This is a local, same-network HTTP interface tied to a fixed default port (14999) — it is not a hosted cloud API, so the room's LAN/host address must be reachable from whatever is calling it
Documentation for this interface lives in Houdini's tutorial articles rather than a single formal API reference, so behavior details are scattered across per-integration tutorials (Arduino, ESP32, PLC, etc.)
Because triggers are simple GET requests with no authentication described in the tutorials, treat the room network as the security boundary — don't expose port 14999 to the public internet
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