luwu XGO mini2plus Robot Dog Owner’s Manual

luwu XGO mini2plus Robot Dog Owner’s Manual

Product Description

XGO-mini2+ Programmable Robot Dog
XGO-mini2+ is a desktop Al robot dog with 12 DOF and a gripper powered by Raspberry Pi CM4 for Al edge computing applications.With 4.5KG.CM serial bus servo,it supports unidirectional movement, 6D posture control, posture stability, and multiple motion gaits, internally equipped with 6-axis IMU, joint position sensors and current sensors to feedback postures, joint rotation and torque readings for internal algorithms and secondary development. The robot dog allows for Block and Python programming via a custom APP or PC for developing Al applications.

Product Data

Model : XGO-mini2+
Dimensions : 270 150 180mm
Weight : 950g
Battery : 7.4V 3800mAh lithium battery
Material :Body-Aviation Aluminium & Legs-Silicone&ABS
Controller : Raspberry Pi CM4+ESP32
Screen : 2.0 inch IPS 320*240
Camera : five-mega-pixel OV5647
Storage : 32G SD card
Charger : 8.4V 1A 100-240V AC 50/60Hz
Laser radar：Range: 0.02-12m Ranging frequency: ≥4500Hz
Scanning frequency: 5-13Hz Scanning angle: ≥360°
Average ranging accuracy: ≤45mm

Al Module Features

The Al module is the master control for Al related applications and has basic computer vision recognition and machine learning model inference, which can facilitate both entry and advanced-level Al applications.

Exploded view of Al module

Key Technologies Employed

IMU posture self-stabilisation
Based on the attitude data obtained from IMU and with closed loop control, the robot dog can remain stable regardless of surface movement.

6 DOFs posture control
With fixed foot tips, allows the entire body to remain under 6 DOF motion control.

Move, Record and Playback
You can even code by simply moving XGO’s joints by hand while automatically recording the sequence for playback as a program.

User communication and secondary programming interface
The open-access underlying serial port protocol applies to secondary development and verification.

Motion gait planning Motion gait planning
The robot dog comes with Low, Medium and High height postures which is linked to three different speeds with appropriate gait strategies and rules are applied.

Kinematics and dynamics simulation interface
In a ROS scenario, kinematics and dynamics simulations are conducted on Rviz and gazebo platforms.

Unidirectional motion
With 12 active joints and through kinematics decoupling, the robot dog can perform unidirectional motion combining Forward/Reverse, Right/Left with Rotational input for a smooth gait in any direction.

Artificial Intelligence
Machine vision, face recognition, speech recognition, model training and other Al functions.

Operation Instruction

Technical Robotic Content

Mechanics
Motor and drive
12 micro-sized servos provide 6 DOF single-leg 3 DOF motion analysis

Sensing
Gyroscope + Accelerator + Magnetometer
Provides joint position, speed of the robot dog, torque (via current) and other motion data.

Simulation
Simulation practice
Kinematics and dynamics simulation

Motion
Motion and drive
Derived forward and inverse kinematics, complete
Cartesian space control and joint space control

Control
Control theory and control planning
PID control, trajectory planning control, space posture stability control.

Intelligence
Robot dog intelligence
Machine vision, speech recognition, face recognition, Face detection and color recognition and other Al functions

Start

Important: Please charge the XGO before using it the first time to increase battery life and DO NOT allow the Battery Charge level to fall below 20% to avoid Battery Degradation over time.

1. How to Power Robot ON and OFF
   Powering ON: First, place the robot dog in a prone position laying down to avoid joints from jamming during initial boot up. Then press the ON/OFF Switch once (the Power Indicator will flash and then illuminate, indicating that the Robot is now Powered ON.
   Powering OFF: Press the ON/OFF Switch once, the Power Indicator will start flashing and the dog will slowly lie down in the prone position. When the Robot is fully at rest the Power Indicator will no longer be illuminated, indicating that the Robot has fully Powered OFF.

2. Charging the Robot: The Robot’s Charging Port is located under the Robot. Insert the Charger Plug into the Charging Port. The Charger’s LED will glow Red while charging and turn Green when the batteries are fully charged.

Display Screen

After the Robot is Powered ON, press “A” or “B” to reach the Application Menu “Try Demos”, then use “A” and “B” separately to scroll up and down to select the desired Al Application, then press “D” to confirm and execute the action selected, press “C” to return to previous menu.

Operating by Phone App

Visit www.xgorobot.com and follow the Quick start, download ‘XGOBOT’app and install.Set a WIFI SSID:XGO2 PWD:Luwu Dynamics, turn on the robot and enter R.C. Mode, there will be a IP address at the bottom of the screen, connect the mobile phone to the same WIFI.

PC Operation

Visit www.xgorobot.com and follow the Quick start, enter XGO-Blackly cloud platform which was second develop from EduBlocks, input the IP address of your XGO, user can simply create programs by just selecting and dragging existing programming blocks.

Special Operation Notes

Caution: This operation is irreversible and the factory settings will be overwritten. Read this manual thoroughly and carefully before you attempt calibration.
When the posture of the Robot dog no longer returns to the proper starting position (per pictures), e.g.: in the standing position, one or more legs cannot touch the floor due to a servo joint being seriously offset, it is likely that the initial position of one or more servos is mechanically offset from the predefined program value. This may be simply due to a loosened screw or a slipped servo gear. If all of the screws are tight, you may need to re calibrate the Robot to establish the mechanical offsets to the original predefined values. To correct this situation, open the XGOBOT APP, connect to the Robot via Wifi, click the option to run as developer and then return to the home screen. Click and go to the calibration screen, click “Calibrate”. At this point, the servo joints of the robot will not output torque, you can rotate all joints freely.

Place the robot dog in the posture as shown above, make sure the shoulder part of every leg is perpendicular to the body, with upper legs perpendicular to the table surface and lower legs perpendicular to the upper legs, open the claw the maximum. This positioning directly affects the working posture of the robot. After the robot is placed in original good starting position, click ” Calibrated” on the calibration screen, after10s the robot will return to the standing posture. If the standing posture is still seriously offset, DO NOT USE the ROBOT, otherwise the robot may malfunction or become damaged. Please contact our after-sales support if you cannot calibrate the Robot to the original good starting position.

Appendix

Precautions:

1. Unplug the unit if left unused. When charging, only use the specific charger that came with the Robot.
2. The Robot’s skeleton and frame are made of metal, use caution when handling to avoid injury to hands and fingers.
3. DO NOT expose the Robot to water, moisture, humid conditions or long periods of direct sunlight. To prevent serious damage, avoid dropping the Robot from any height.
4. CAUTION: After prolonged periods of use, the Servos (in the leg joints and hips) may become warm. This is normal, but higher than normal operating temperatures through continuous and prolonged use may cause permanent harm to the Servos. It is strongly advised not to use the Robot for extended periods of time.

Maintenance and Storage:

Caution : ALWAYS Power the Robot OFF before attempting ANY maintenance procedure.

1. Clean the exposed surfaces of the Robot while not exposing the control board to any moisture.
2. Check for loose screws and tighten any you may find.
3. When storing or transporting your Robot, use the special packaging box that your XGO came in, to avoid accidental damage. The Robot’s four legs should be securely retained in the foam cutouts to avoid excessive movement during transport.

Troubleshooting

little or no charge remaining (check the battery charge indicator in the App to verify)| Charge the battery with the supplied power adapter
The ON/OFF Indicator is lit but no actions are executed after the unit is Powered ON| There is a problem with the control system Robot is still in calibration mode| Contact our after-sales support for advice or repair service
The standing posture is seriously offset compared to the Robot’s reference picture| The initial position is offset from the predefined values| Re calibrate the Servo Joints according to Special Operation Notes
One joint has no torque output (no movement is observed at this joint)| The Servo of the join is damaged| Contact our after-sales support for repair service

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