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Lighthouse 2.0

With adjustable light characteristic

Lighthouse 2.0
In the November 2011 issue Elektor presented a circuit by Leo Szumylowycz that simulated the rotating beacon of a lighthouse [1]. That circuit used only analogue components, such as the legendary 555 timer chip and a common LM358 opamp. It worked perfectly. The only disadvantage was the number of components that were required — a total of 29. Using an ATtiny45 microcontroller the expenditure on components can be drastically reduced. The circuit presented here requires only eight parts yet offers an extensive range of functions.
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