Altimeter

Overview

The Altimeter sits top-right in the six-pack "T" arrangement, showing pressure altitude via one or more pointers against a 1,000 ft graduated dial, with a Kollsman window for barometric pressure setting.

Construction

Like the other six-pack instruments, this gauge is built as a self-contained module:

• Bezel / Face Plate — 3D-printed bezel with a printed altitude scale dial face
• Dial / Needle — one or more pointers (hundreds/thousands) sweeping the dial
• Internal Mechanics — stepper motor(s) driving the pointer(s); the Kollsman window's setting knob is an encoder, so the pressure X-Plane flies with follows it
• Back Housing — 3D-printed enclosure mounting to the MIP frame's instrument cutout
• PCB & Controller — ESP32 driving the stepper(s) from the X-Plane altitude dataref
• Lighting — backlighting for night/IFR panel illumination

X-Plane Integration

sim/cockpit2/gauges/indicators/altitude_ft_pilot
sim/instruments/barometer_up / barometer_down   pressure setting knob
sim/instruments/barometer_2992                  knob push: standard pressure

The pressure knob is an encoder bound to X-Plane (GPIO 25, 26, push on 27 in the Cessna 172 (six-pack) Blueprint), so the altitude the simulator flies matches the setting. The pointers turn all the way round and need a continuous-rotation gauge stepper, which CockpitConnect doesn't drive yet.

Status

Planning — design not yet started.