When Arduino Uno starts up

forever

    set value to analog read pin A0



    if value < 300 then

        set pwm pin 9 output 255
        set pwm pin 10 output 0
        set pwm pin 11 output 0



    else if value < 600 then

        set pwm pin 9 output 0
        set pwm pin 10 output 255
        set pwm pin 11 output 0



    else

        set pwm pin 9 output 0
        set pwm pin 10 output 0
        set pwm pin 11 output 255