hardware/openscad/ rebuilds the broken Fusion models as OpenSCAD:
body (top/bottom plate, standoffs, battery bay, switch), legs (coxa
bracket, femur link, tibia, horn adapters, TPU socks, servo cables),
the whole robot, and the remote (shell, lid, Nextion 3.5", JH-D400X-R4
sticks, 18650 UPS board, IMU, Teensy 4.0, USB-C breakout). Every part
was checked by slicing against the original STEP solids; the original's
bugs are fixed and listed in PLANNING.md.
The robot now uses a hexagon leg layout (corner legs 60 deg round from
the mid legs; the corner coxa brackets need turning on their splines).
Physical limits from a collision sweep of the model are in Config.h:
per-leg coxa limits and LEG_CLEARANCE_MM 56 (a leg is 55.2 mm wide at
the joints); the sim API exports them (version 7). sim_smoke passes.
Unity loads the model (export_unity.py -> Resources/OpenScadModel,
OpenScadModel.cs builds a new rig in place of the old scene's robot).
The PCB model's mounting holes now use the exact EasyEDA grid. README
shows renders of both.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Simulation
- sim/: the unchanged robot firmware compiled into hexapod_sim.dll
against PC stand-ins (Arduino, Servo, Wire + register-level MPU6050,
RF24 with matching-config radio), a kinematic body model (support
plane + planted-foot odometry) that also drives the simulated IMU,
and a headless smoke test (sim_smoke). build.ps1 builds and tests.
- Hexapod_Simulation_Unity/ folded in (history kept in a bundle
outside the repo). Assets/HexapodSim loads the DLL, drives the
existing leg rig, and offers joystick / keyboard / robot-serial
input plus a test panel.
Robot (all found or confirmed in the simulation)
- Config.h geometry taken from the Unity model.
- IK femur elevation sign, gait stance direction, body pose
rotation direction, yaw lever arm.
- Stance feet integrated from the current command; gait restarts at
mid-stance; heading integrates the applied turn rate, only while
walking.
- Leg clearance and reach checks (Limits::feetFeasible); walk command
and body pose scaled as a whole, pose scale rate-limited, planted
feet guarded so the body never snaps or legs collide.
- Robot-gyro self-leveling as an integrator.
- Heading mode: steering relative to the body; S walks backward.
- Standing height from the remote (STANCE_HEIGHT_RANGE_MM).
Protocol v3 (reflash both boards)
- CmdPacket gains body_height (22 bytes).
Remote
- Height slider (Nextion hHeight/nHeight, serial [ ]).
- Fixed unspecified I2C read order in RemoteIMU.
LEGACY/: owner's old Nextion HMI and remote hardware assets.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
mangavalkandClaude Opus 5.5