The DeepRacer Servo ROS package creates the servo_node that is responsible to map the input servo throttle and steering angle messages to raw PWM values to move the car.
The servo_node provides the core functionality to combine the camera data from the cameras connected to the USB slots at the front of the AWS DeepRacer vehicle. Although the node is built to work with the AWS DeepRacer application, you can run it independently for development, testing, and debugging purposes.