JetRacer ROS AI Kit Tutorial I: Assembly Manual

JetRacer ROS Kit User Guide

JetRacer AI Assembly Steps

Install Motors and Rear Wheels

1. Fix the motor on the metal chassis. Note that M3*6 screws are used here. If the wrong long screws are used, the motor will not rotate normally.

2. Fix the coupler screws on the coupler with the spanner.

3. Install the coupler on the motor shaft and lock the screws. (Note that the coupler screws should be locked on the shaft side.)

4. Install the tires on the coupler with PM4*8.

5. Install the servo bracket on the metal chassis.

Servo Middle Position and Installation

1. Install the battery on the expansion board, connect the charger and activate the battery protection.

2. Turn on the power switch after activating the battery successfully. The LED on the board will flash.

3. Connect the servo to the expansion board, and the servo will rotate to 90 degrees, that is, the middle position. Note: the servo cable order is: Yellow-PWM, Red-5V, Brown-GND

4. Fix the servo in the bracket with M3*8 screws and M3 nut, and pay attention to the servo direction.

Install Servo Wheel and Connecting Rod

1. Fix M3*22 standoffs with PM3*8.

2. Install the metal servo wheel on the servo, make sure that the holes of the servo wheel appear as a cross, and then install. If there is no cross, you can slowly rotate the servo wheel until a cross appears and then install it.

3. Fix the servo wheel fixing panel to the metal servo wheel with the included screws.

4. Use two M3 ball joints (small) and a short rod to form the pull bar of the servo. Use two M3 ball joints (big) and a long rod to form the pull bar of the front wheel. The two ball heads are horizontal.

5. Use KM2.5*12 screws and M2 self-lock nuts to fix the flat end of the pull bar on the servo.

6. Install the camera bracket on the M3*22 standoffs by PM3*8.

7. Install the large and small bearings in the steering knuckle.

8. Lock the wheel on the steering knuckle with KM4*20 screws and M4 self-lock nuts. Be careful not to lock it too loosely here to avoid shaking the front wheel of the car, and also not to lock it too tightly so that the front wheel cannot rotate normally. After the installation is completed, turn the wheel to test whether it can rotate smoothly.

9. Use PM2*30 screws and M2 self-lock nuts to install the front wheel on the JetRacer. Be careful not to lock it too tightly. After the installation is complete, turn it left and right to test whether it turns smoothly.

10. Adjust the length of the servo pull bar so that when the servo is 90 degrees, the tires will not deflect towards the front.

11. Install the pull bars of the servo and front wheels on the steering knuckle with KM2.5*20 screws and M2.5 self-lock nut. Note that the servo rod is at the top, and the front pull rod is at the bottom. For the first time, you need to screw the screw into the hole of the steering cup.

12. Adjust the pull bar length of the front wheel so that the left and right wheels are parallel and facing straight ahead without deflection. Finally, use KM2.5*16 screws and M2.5 self-lock nuts to lock the pull bar of the front wheel to the steering knuckle.

Install Anti-collision Cotton

1. Fix the standoffs (M3*20) for the anti-collision cotton with PM3*8.

2. Install the anti-collision cotton and press the metal case on it with PM3*8.

Install Jetson Nano

1. Fix the standoffs on the expansion board with PM3*8.

2. Install the Jetson Nano module on the expansion board with M2.5*30 + 6. Note: Please remove the battery in this step! It is very easy to short-circuit and burn out when disassembling Jetson Nano while it is powered on. When the power switch of the expansion board is off, part of the circuit is still charged.
3. Remove the Jetson Nano module, install the wireless NIC on the carrier board, and install the antenna.

4. Place the Jetson Nano module back, install one end of the antenna on the expansion board, and lock it with the spanner.

5. Install the batteries.

6. Connect one end of the motor cable to the expansion board and the other end to the motor. Connect the servo cable to the expansion board and install the battery pad.

7. Adjust the wiring of the servo and motor, and fix the expansion board to the chassis of the JetRacer with PM3*8 screws.

8. Install the cooling fan into the Jetson Nano with the included screws. Note that the label faces down, and connect the cooling fan power cable.

Install Camera

1. Use black nylon screws PM2*8 to fix the camera, insulating sheet, and camera spacer together.

2. Connect the camera cable, and fix the camera on the camera bracket with the flat screw M2.5*5.

Installl Radar

1. Install radar cables.

2. Fix the acrylic panel to the radar with PM2.5*5.

3. Fix the radar on the M2.5*30 + 6 standoffs with PM2.5*5 screws, connect the radar cables.

4. Install the antenna.

5. Install the USB connector and the motor case. Now the installation is complete.

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