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change wheel setup in kinematics (#811) 

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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Pepijn 2025-03-04 18:42:45 +01:00 committed by GitHub
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commit a003e7c081
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1 changed files with 11 additions and 13 deletions
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24
lerobot/common/robot_devices/robots/mobile_manipulator.py
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@ -392,21 +392,19 @@ class MobileManipulator:
for name in self.leader_arms:
pos = self.leader_arms[name].read("Present_Position")
pos_tensor = torch.from_numpy(pos).float()
# Instead of pos_tensor.item(), use tolist() to convert the entire tensor to a list
arm_positions.extend(pos_tensor.tolist())
# (The rest of your code for generating wheel commands remains unchanged)
x_cmd = 0.0 # m/s forward/backward
y_cmd = 0.0 # m/s lateral
y_cmd = 0.0 # m/s forward/backward
x_cmd = 0.0 # m/s lateral
theta_cmd = 0.0 # deg/s rotation
if self.pressed_keys["forward"]:
x_cmd += xy_speed
if self.pressed_keys["backward"]:
x_cmd -= xy_speed
if self.pressed_keys["left"]:
y_cmd += xy_speed
if self.pressed_keys["right"]:
if self.pressed_keys["backward"]:
y_cmd -= xy_speed
if self.pressed_keys["left"]:
x_cmd += xy_speed
if self.pressed_keys["right"]:
x_cmd -= xy_speed
if self.pressed_keys["rotate_left"]:
theta_cmd += theta_speed
if self.pressed_keys["rotate_right"]:
@ -584,8 +582,8 @@ class MobileManipulator:
# Create the body velocity vector [x, y, theta_rad].
velocity_vector = np.array([x_cmd, y_cmd, theta_rad])
# Define the wheel mounting angles with a -90° offset.
angles = np.radians(np.array([240, 120, 0]) - 90)
# Define the wheel mounting angles (defined from y axis cw)
angles = np.radians(np.array([300, 180, 60]))
# Build the kinematic matrix: each row maps body velocities to a wheel’s linear speed.
# The third column (base_radius) accounts for the effect of rotation.
m = np.array([[np.cos(a), np.sin(a), base_radius] for a in angles])
@ -641,8 +639,8 @@ class MobileManipulator:
# Compute each wheel’s linear speed (m/s) from its angular speed.
wheel_linear_speeds = wheel_radps * wheel_radius
# Define the wheel mounting angles with a -90° offset.
angles = np.radians(np.array([240, 120, 0]) - 90)
# Define the wheel mounting angles (defined from y axis cw)
angles = np.radians(np.array([300, 180, 60]))
m = np.array([[np.cos(a), np.sin(a), base_radius] for a in angles])
# Solve the inverse kinematics: body_velocity = M⁻¹ · wheel_linear_speeds.