# VOXL 2 Mini: technical questions for a custom indoor inspection drone (SLAM, precision landing, cameras)

Source: https://forum.modalai.com/topic/5302/voxl-2-mini-technical-questions-for-a-custom-indoor-inspection-drone-slam-precision-landing-cameras
Category: Flight Core and Legacy VOXL (https://forum.modalai.com/category/9/flight-core-and-legacy-voxl)
Tags: voxl2mini, slam, apriltag, flight-deck
Posted: 2026-07-01 01:49:58 UTC by 김진혁
Replies: 2 · Views: 1277

## 김진혁 · 2026-07-01 01:49:58 UTC

Hi ModalAI team,

We were directed here from the sales channel. A few technical questions for our indoor GPS-denied inspection PoC — a compact custom quadcopter (X4) airframe built around the VOXL 2 Mini.

[SLAM / autonomy]
- VOA performance in narrow (~300 mm) corridors — any pipe / industrial refs?
- Open-VINS is pure VIO (no loop closure) — for repeated long flights, is Mapper + AprilTag re-localization enough to bound drift?

[Precision landing]
- voxl-vision-hub provides AprilTag relocalization but notes it "does not yet support autonomous takeoff and landing." Is a fully automated AprilTag precision landing onto a charging dock achievable using the VOXL SDK alone (voxl-tag-detector / voxl-vision-hub + PX4 precision-land), without us writing our own landing logic? If so, what is the recommended setup? If some part still needs custom development, which part?

[Cameras / sensors]
- VOXL 2 Mini has 4 MIPI-CSI. Using 2 for VIO + 1 downward for precision landing = 3. Can a 4th camera (gimbal / thermal) be added, and how?
- For the downward precision-landing camera, is MSU-M0166 (AR0144 micro-coax) the right choice? Can that downward AR0144 be shared by both VIO and the voxl-tag-detector (AprilTag) at the same time?
- Recommended ToF module for collision avoidance?

[Airframe / drivetrain]
- Is VOXL ESC Mini (M0129) compatible with our own motor selection (DShot/PWM) in a standard quadcopter (X4) configuration?
- Any thermal / layout guidance for integrating VOXL 2 Mini + ESC Mini into a custom ducted-cage airframe?

[Mission / comms]
- Vision Hub: can an external host (our charging station) send trajectories and trigger auto takeoff / landing?
- WiFi 2.4 GHz stability indoors — recommended radio module?

Note: We don't have hardware yet (pre-purchase), so voxl-version / voxl-inspect-services / PX4 logs are not available at this stage.

Thanks!
JinHyeok Kim, Pablo Air

## Reply by 김진혁 · 2026-07-05 23:40:24 UTC

Gentle bump — it's been 5 days and this thread is still open with no reply. Would really appreciate any input from the ModalAI engineering team on the questions above (VOA/SLAM in narrow ~300 mm corridors, fully automated AprilTag precision landing via the VOXL SDK alone, and sharing the downward AR0144 between VIO and voxl-tag-detector). Even partial pointers would help a lot — we're evaluating the VOXL 2 Mini for a PoC and are ready to buy an evaluation unit. Thanks!

## Reply by 김진혁 · 2026-07-16 02:26:29 UTC

@alex-kushleyev @eric-katzfey Apologies for the direct mention — I hope you don't mind.

I posted this question set about two weeks ago (and a related product question three weeks ago), but haven't heard back yet. We are preparing to purchase a **Starling 2 Max (C29, with the PMD ToF)** as an evaluation unit for an indoor GPS-denied inspection project, and just three answers would unblock our decision:

1. Can VOXL SLAM / VOA (with the dense PMD ToF on the C29 configuration) reliably handle **very narrow corridors — around 300 mm width**? Any references to pipe/industrial inspection use cases in similar tight spaces would be very helpful.
2. For **repeated missions in the same indoor space**, is voxl-mapper + AprilTag re-localization the recommended pattern to bound Open-VINS drift (no loop closure)?
3. What is the practical **minimum illumination** for reliable VIO with the tracking cameras — and do you recommend onboard IR/LED illumination for dim industrial interiors?

Even brief pointers to relevant docs would be greatly appreciated. Thank you for the great platform and documentation!