D7 has PWM! (other not connected pins with a timer as well). The 16u2 pinout is the same for Arduino Uno/Mega. Keep in mind that the Leds have inverted logic. Writing LOW means turn them on. 16u2 ...

Schematic of Arduino PWM LED Controller Circuit. Advertisement. ... the three LEDs are directly connected to Arduino pins with independent current limiting ... (D9) on the Arduino. If you want to see ...