Raspberry PWM LED Control

• https://electronicshobbyists.com/raspberry-pi-pwm-tutorial-control-brightness-of-led-and-servo-motor/

We'll use GPIO 24/ Pin 18 to drive the LED as in the default configuration of rc-dukes.

see Self_Driving_RC_Car#Servo Interface - Servoblaster

GPIO 24 has ServoId 6 so

echo 6=120 > /dev/servoblaster

will set the LED to half bright