// Connections
// Raspberry Pi 4 :
//                                L298N Motor Driver Module
// GPIO 17 ----------------------- IN_1 
// GPIO 27 ----------------------- IN_2
// GPIO 22 ----------------------- EN_A
// GPIO 10 ----------------------- IN_3
// GPIO  9 ----------------------- IN_4
// GPIO 11 ----------------------- EN_B
//
//
// Arduino Nano :  
//                                DFRobot Serial 6-Axis Accelerometer
// D11 --------------------------- TX 
// D12 --------------------------- RX
//                                SSD1306 OLED 128x32
// A4  --------------------------- SDA
// A5  --------------------------- SCL    
//                                Buzzer
// D10 --------------------------- S

First of all, I assembled the DFRobot Black Gladiator (Tracked Robot Chassis) and connected an L298N motor driver module to the robot chassis to control its DC motors easily with Raspberry Pi GPIO pins.

⭐ Install the load-bearing wheel (first install the M4*50 long screw into the load-bearing wheel) and lock the other side with the M4 screw.

⭐ Place the gasket on the bracket and insert the load-bearing wheel into the hole of the bracket. Then, seal it with the other gasket and the M4 nut.

⭐ Insert the motor into the bracket and tighten it with 3 M3*6 flat head screws.

⭐ Join the two sides of the drive wheel and lock it with the M3*8 hex socket screw.

⭐ Attach the drive wheel to the motor and tighten the connection with the black screw sent with the kit.

⭐ Disconnect the track to measure the required track length and discard the redundant part.

⭐ Wrap and reconnect the track after attaching it to the wheels.

⭐ Solder male jumper wires to motors and connect them to the L298N Motor Driver Module. Then, fasten the L298N module to the bottom of the bracket with a hot glue gun.

Then, I connected the RPLIDAR A1M8 360 Degree Laser Scanner (Lidar) and the USB webcam to the Raspberry Pi 4.