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Thanks.Note that you can also make LEDs flash using analog electronics. Look up astable multivibrator. Example : http://www.electronics-tutorials.ws/waveforms/astable.html . The end of that article integrates nicely with yours.
Thank you for these articles, I am interested in the sequel.
I expected more from this article. Two years ago, there were almost no direct light bulb replacement leds that were bright enough. But there are now. I believe I bought the one in this picture at Ikea.