Chapter 6: Special effects This technique is adaptable to any sort of blinking or flashing lights from computers to air- craft warning lights on stacks. Tip: Waveform control- lers can be stacked and combined to create coded blinking lights, too. For example, some buoys blink with Morse codes, and you could achieve a combination of short and long blinks that repeat over time. Figure 6.43 The waveform must be adjusted to generate only positive values for the light's intensity and to control the blink rate.