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hexapod-robot/2026-current/README.md
T
mangavalkandClaude Opus 5.5 935526eab5 Firmware simulation, Unity project, and sim-verified robot fixes
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>
2026-09-29 00:37:12 +02:00

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Markdown

# Hexapod
A six-legged walking robot (Teensy 4.0) and its handheld remote
(Teensy 4.1 + Nextion touchscreen), linked over nRF24L01.
```
robot/ robot firmware: IK, gait, body pose, IMU stabilization, state machine
remote/ remote firmware: 2 x 3-axis sticks, MPU6050 tilt, Nextion UI, RF24 TX
shared/ HexapodProtocol: the CmdPacket wire format + radio settings used by both
sim/ the unchanged robot firmware compiled into a DLL for the simulation
Hexapod_Simulation_Unity/ Unity project that runs that DLL on the 3D model
LEGACY/ older material kept for reference
scripts/ PlatformIO helper (per-environment sketch folder)
```
## Build (PlatformIO)
```
pio run # build both
pio run -e robot -t upload
pio run -e remote -t upload
pio device monitor -e robot
```
## Simulation
From the repo root in PowerShell (the dev PC is Windows):
```
.\sim\build.ps1 # build hexapod_sim.dll + run the headless firmware checks
```
Then open `Hexapod_Simulation_Unity` and press Play. See
[sim/README.md](sim/README.md).
## Where to go next
- **[robot/README.md](robot/README.md)**: placeholder geometry to measure,
the bench-check checklist, and the serial test harness for driving the
robot without a remote.
- **[remote/README.md](remote/README.md)**: wiring, control scheme, stick
calibration, and the remote's serial console.
- **[remote/NEXTION.md](remote/NEXTION.md)**: how to build the touchscreen
HMI.
- **[shared/HexapodProtocol/HexapodProtocol.h](shared/HexapodProtocol/HexapodProtocol.h)**:
the protocol. Change it only by reflashing both boards.