#
HopeJR

##
Prerequisites

- Hardware Setup

##
Install LeRobot

Follow the installation instructions to install LeRobot.

Install LeRobot with HopeJR dependencies:

    pip install -e ".[hopejr]"

##
Device Configuration

Before starting calibration and operation, you need to identify the USB ports for each HopeJR component. Run this script to find the USB ports for the arm, hand, glove, and exoskeleton:

    lerobot-find-port

This will display the available USB ports and their associated devices. Make note of the port paths (e.g., `/dev/tty.usbmodem58760433331`, `/dev/tty.usbmodem11301`) as you’ll need to specify them in the `--robot.port` and `--teleop.port` parameters when recording data, replaying episodes, or running teleoperation scripts.

##
Step 1: Calibration

Before performing teleoperation, HopeJR’s limbs need to be calibrated. Calibration files will be saved in `~/.cache/huggingface/lerobot/calibration`

###
1.1 Calibrate Robot Hand

    lerobot-calibrate \
        --robot.type=hope_jr_hand \
        --robot.port=/dev/tty.usbmodem58760432281 \
        --robot.id=blue \
        --robot.side=right

When running the calibration script, a calibration GUI will pop up. Finger joints are named as follows:

Thumb:

- CMC: base joint connecting thumb to hand
- MCP: knuckle joint
- PIP: first finger joint
- DIP : fingertip joint

Index, Middle, Ring, and Pinky fingers:

- Radial flexor: Moves base of finger towards the thumb
- Ulnar flexor: Moves base of finger towards the pinky
- PIP/DIP: Flexes the distal and proximal phalanx of the finger

Each one of these will need to be calibrated individually via the GUI. Note that ulnar and radial flexors should have ranges of the same size (but with different offsets) in order to get symmetric movement.

Use the calibration interface to set the range boundaries for each joint as shown above.

Once you have set the appropriate boundaries for all joints, click “Save” to save the calibration values to the motors.

###
1.2 Calibrate Teleoperator Glove

    lerobot-calibrate \
        --teleop.type=homunculus_glove \
        --teleop.port=/dev/tty.usbmodem11201 \
        --teleop.id=red \
        --teleop.side=right

Move each finger through its full range of motion, starting from the thumb.

    Move thumb through its entire range of motion.
    Recording positions. Press ENTER to stop...

    -------------------------------------------
    NAME      |    MIN |    POS |    MAX
    thumb_cmc |   1790 |   1831 |   1853
    thumb_mcp |   1497 |   1514 |   1528
    thumb_pip |   1466 |   1496 |   1515
    thumb_dip |   1463 |   1484 |   1514

Continue with each finger:

    Move middle through its entire range of motion.
    Recording positions. Press ENTER to stop...

    -------------------------------------------
    NAME                 |    MIN |    POS |    MAX
    middle_mcp_abduction |   1598 |   1718 |   1820
    middle_mcp_flexion   |   1512 |   1658 |   2136
    middle_dip           |   1484 |   1500 |   1547

Once calibration is complete, the system will save the calibration to `/Users/your_username/.cache/huggingface/lerobot/calibration/teleoperators/homunculus_glove/red.json`

###
1.3 Calibrate Robot Arm

    lerobot-calibrate \
        --robot.type=hope_jr_arm \
        --robot.port=/dev/tty.usbserial-1110 \
        --robot.id=white

This will open a calibration GUI where you can set the range limits for each motor. The arm motions are organized as follows:

- Shoulder: pitch, yaw, and roll
- Elbow: flex
- Wrist: pitch, yaw, and roll

Use the calibration interface to set the range boundaries for each joint. Move each joint through its full range of motion and adjust the minimum and maximum values accordingly. Once you have set the appropriate boundaries for all joints, save the calibration.

###
1.4 Calibrate Teleoperator Exoskeleton

    lerobot-calibrate \
        --teleop.type=homunculus_arm \
        --teleop.port=/dev/tty.usbmodem11201 \
        --teleop.id=black

The exoskeleton allows one to control the robot arm. During calibration, you’ll be prompted to move all joints through their full range of motion:

    Move all joints through their entire range of motion.
    Recording positions. Press ENTER to stop...

    -------------------------------------------
    -------------------------------------------
    NAME            |    MIN |    POS |    MAX
    shoulder_pitch  |    586 |    736 |    895
    shoulder_yaw    |   1257 |   1374 |   1390
    shoulder_roll   |    449 |   1034 |   2564
    elbow_flex      |   3023 |   3117 |   3134
    wrist_roll      |   3073 |   3096 |   3147
    wrist_yaw       |   2143 |   2171 |   2185
    wrist_pitch     |   1975 |   1993 |   2074
    Calibration saved to /Users/your_username/.cache/huggingface/lerobot/calibration/teleoperators/homunculus_arm/black.json

##
Step 2: Teleoperation

Due to global variable conflicts in the Feetech middleware, teleoperation for arm and hand must run in separate shell sessions:

###
Hand

    lerobot-teleoperate \
        --robot.type=hope_jr_hand \
        --robot.port=/dev/tty.usbmodem58760432281 \
        --robot.id=blue \
        --robot.side=right \
        --teleop.type=homunculus_glove \
        --teleop.port=/dev/tty.usbmodem11201 \
        --teleop.id=red \
        --teleop.side=right \
        --display_data=true \
        --fps=30

###
Arm

    lerobot-teleoperate \
        --robot.type=hope_jr_arm \
        --robot.port=/dev/tty.usbserial-1110 \
        --robot.id=white \
        --teleop.type=homunculus_arm \
        --teleop.port=/dev/tty.usbmodem11201 \
        --teleop.id=black \
        --display_data=true \
        --fps=30

##
Step 3: Record, Replay, Train

Record, Replay and Train with Hope-JR is still experimental.

###
Record

This step records the dataset, which can be seen as an example here.

    lerobot-record \
        --robot.type=hope_jr_hand \
        --robot.port=/dev/tty.usbmodem58760432281 \
        --robot.id=right \
        --robot.side=right \
        --robot.cameras='{"main": {"type": "opencv", "index_or_path": 0, "width": 640, "height": 480, "fps": 30}}' \
        --teleop.type=homunculus_glove \
        --teleop.port=/dev/tty.usbmodem1201 \
        --teleop.id=right \
        --teleop.side=right \
        --dataset.repo_id=nepyope/hand_record_test_with_video_data \
        --dataset.single_task="Hand recording test with video data" \
        --dataset.num_episodes=1 \
        --dataset.episode_time_s=5 \
        --dataset.push_to_hub=true \
        --dataset.private=true \
        --display_data=true

###
Replay

    lerobot-replay \
        --robot.type=hope_jr_hand \
        --robot.port=/dev/tty.usbmodem58760432281 \
        --robot.id=right \
        --robot.side=right \
        --dataset.repo_id=nepyope/hand_record_test_with_camera \
        --dataset.episode=0

###
Train

    lerobot-train \
      --dataset.repo_id=nepyope/hand_record_test_with_video_data \
      --policy.type=act \
      --output_dir=outputs/train/hopejr_hand \
      --job_name=hopejr \
      --policy.device=mps \
      --wandb.enable=true \
      --policy.repo_id=nepyope/hand_test_policy

###
Evaluate

This training run can be viewed as an example here.

    lerobot-record \
      --robot.type=hope_jr_hand \
      --robot.port=/dev/tty.usbmodem58760432281 \
      --robot.id=right \
      --robot.side=right \
      --robot.cameras='{"main": {"type": "opencv", "index_or_path": 0, "width": 640, "height": 480, "fps": 30}}' \
      --display_data=false \
      --dataset.repo_id=nepyope/eval_hopejr \
      --dataset.single_task="Evaluate hopejr hand policy" \
      --dataset.num_episodes=10 \
      --policy.path=outputs/train/hopejr_hand/checkpoints/last/pretrained_model

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