Search found 58 matches

by greta78
Sun Aug 30, 2026 11:59 am
Forum: Sensors & Perception Systems
Topic: What sensor suite would you consider the bare minimum for safe bipedal walking?
Replies: 22
Views: 228

Re: What sensor suite would you consider the bare minimum for safe bipedal walking?

<t>@elarsen I dealt with almost this exact situation.

Event cameras (which report per-pixel brightness changes rather than full frames) are still more of a research curiosity than a production sensor for humanoids, mainly because the software ecosystem and processing pipelines around them are far ...
by greta78
Sun Aug 30, 2026 11:59 am
Forum: Actuators, Motors & Drivetrains
Topic: How much does connector reliability actually contribute to field failures?
Replies: 34
Views: 210

Re: How much does connector reliability actually contribute to field failures?

<t>@carol38 I dealt with almost this exact situation.

Encoder resolution requirements scale with how tightly you need to control low-speed motion - coarse encoders are fine for open-loop swing phases but cause visible stutter during precise placement or fine force control. Field-oriented control ...
by greta78
Sun Aug 30, 2026 11:59 am
Forum: Actuators, Motors & Drivetrains
Topic: How do you even quantify 'feel' when comparing two actuators?
Replies: 42
Views: 491

Re: How do you even quantify 'feel' when comparing two actuators?

<t>@park44 Agreed, and I'd add:

Motor cogging torque (the 'notchy' feel from magnet-to-slot interactions) shows up as small periodic torque ripple that can translate into visible joint jitter at low speeds - it's usually mitigated with skewed magnets, better current control, or software ...
by greta78
Sun Aug 30, 2026 11:59 am
Forum: Sensors & Perception Systems
Topic: Best practices for IMU-to-camera extrinsic calibration on a moving robot?
Replies: 51
Views: 395

Re: Best practices for IMU-to-camera extrinsic calibration on a moving robot?

<t>@servosan90 That's the official framing, at least - reality tends to lag a bit.

Multi-camera calibration drifts over time from thermal expansion, vibration, and mechanical wear, which is why production systems typically run periodic recalibration routines rather than assuming a one-time ...
by greta78
Sun Aug 30, 2026 11:59 am
Forum: Sensors & Perception Systems
Topic: What sensor would meaningfully reduce false positives in obstacle detection?
Replies: 54
Views: 550

Re: What sensor would meaningfully reduce false positives in obstacle detection?

<t>This matches something I went through recently.

Event cameras (which report per-pixel brightness changes rather than full frames) are still more of a research curiosity than a production sensor for humanoids, mainly because the software ecosystem and processing pipelines around them are far ...
by greta78
Sun Aug 30, 2026 11:59 am
Forum: Sensors & Perception Systems
Topic: What's the real-world accuracy of visual odometry on a walking humanoid?
Replies: 55
Views: 495

Re: What's the real-world accuracy of visual odometry on a walking humanoid?

<t>Follow-up question though -

Event cameras (which report per-pixel brightness changes rather than full frames) are still more of a research curiosity than a production sensor for humanoids, mainly because the software ecosystem and processing pipelines around them are far less mature than for ...
by greta78
Sun Aug 30, 2026 11:59 am
Forum: Sensors & Perception Systems
Topic: What's the real-world accuracy of visual odometry on a walking humanoid?
Replies: 55
Views: 495

Re: What's the real-world accuracy of visual odometry on a walking humanoid?

<t>@noah_pate To answer this directly:

Proprioception (the robot's sense of its own joint angles, velocities, and forces) tends to get less attention than flashy vision systems, even though a lot of balance and manipulation failures trace back to proprioceptive noise or miscalibration rather than ...
by greta78
Sun Aug 30, 2026 11:59 am
Forum: Manipulation, Grippers & Dexterous Hands
Topic: Anyone using simulation-only training for grasp policies with zero real data?
Replies: 38
Views: 456

Re: Anyone using simulation-only training for grasp policies with zero real data?

<t>+1 to this. Worth adding:

Object occlusion by the robot's own hand during the final approach to a grasp is a common and annoying perception problem - the closer the hand gets to a good grasp position, the more it blocks the camera's view of exactly what it's about to grab. Underactuated hands ...
by greta78
Sun Aug 30, 2026 11:59 am
Forum: Power Systems & Thermal Management
Topic: Anyone building their own cell-level monitoring instead of trusting a BMS chip?
Replies: 22
Views: 350

Re: Anyone building their own cell-level monitoring instead of trusting a BMS chip?

<t>@betty.king Yeah, this tracks with what I've read as well.

Distributed power architectures (multiple smaller packs or local capacitor buffering near high-draw actuators) can reduce peak current demands on the main bus and improve fault isolation, at the cost of added complexity versus a single ...
by greta78
Sun Aug 30, 2026 11:59 am
Forum: DIY & Hobbyist Builds
Topic: Anyone built custom PCBs for motor control instead of buying drivers?
Replies: 27
Views: 253

Re: Anyone built custom PCBs for motor control instead of buying drivers?

<t>@ramirez77 Worth being a little skeptical of the marketing angle here.

A first successful unassisted walk, from a standing start on a from-scratch project, commonly takes many months of part-time weekend work even for someone with a solid mechanical and software background - it's a genuinely ...