Annunciator Box
The shared backlit annunciator module used across the Cessna 172SP cockpit — master caution/warning lights on the MIP sub-panel, with project-specific legends and dimensions.
Overview
The annunciator box is a shared module: a small backlit, laser-engraved indicator used wherever this cockpit needs an illuminated caution/warning legend. Rather than documenting the build on every panel that uses one, this page covers the Cessna 172SP-specific legends, dimensions, and counts — the general build technique is covered separately.
For the general build process — CAD design, 3D-printed housing, laser-engraved face plate, light diffuser, and LED wiring — see Building a Backlit Annunciator Box. This page covers only the Cessna 172SP-specific legends, dimensions, and usage.
Used In
- MIP Frame & Structure — the annunciator panel above the lower sub-panel, shared by both avionics modules
Legends
The Cessna 172SP has no master caution or warning. Its annunciator panel uses these legends, each lit from an X-Plane 12 dataref:
| Legend | Dataref |
|---|---|
| VOLTS | sim/cockpit2/annunciators/low_voltage |
| OIL PRESS | sim/cockpit2/annunciators/oil_pressure |
| VAC | sim/cockpit2/annunciators/low_vacuum |
| LOW FUEL | sim/cockpit2/annunciators/fuel_quantity |
In the Blueprints they are LEDs on GPIO 23, 27, 32 and 33 of the annunciator box's own ESP32.
Status
Planning — legend list and per-box dimensions for this project not yet finalised.