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High power blue LED flasher with PIC16F628

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Uploaded on Mar 21, 2010

A total of six 3-Watt LED's (strange HHEC types), a few resistors, 2 BD675 NPN-darlington-transistors, and a 16F628 make up this high-power LED flash circuit.

I bought the blue LED's at a dump-store in IJmuiden. There is very little information about these things: only the white version of these round multi-die LED's has a datasheet somewhere on the internet. With a driving current of 600 mA for white, I decided to use the same current for the blue ones.
With a resistor of 4,7 ohm in series with the 3 LED's, the current per group of LED's is about 650 mA (slightly overdriven... but probably harmless)

The flash-pattern is just a program of 4 different flash-patterns inside the uC.

The brightness is absurd, and one of the reasons why I don't like LED-lighting on emergency-vehicles.

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