Cascading 555 Timers for Custom Blinking LEDs

For the past several weeks we’ve looked at blinky LEDs, 555 timers, and resistors. This week it’s time to put it all together into an application. A YouTube subscriber suggested the project as follows:

How would you go about having an led blink twice, then a different one blink twice, then back to the original one, and repeat; similar to a navigational light system on an airplane wing?

The stipulation was that the circuit needed to be built from a 555 timer. Takes some time to think about the problem. Maybe re-watch some of the other videos. When you’re ready continue to the answer below.

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