Nice article. Keep up the good work.
I have one thing about using relays as LED switches/flashes. If you will use a relay (not SSR one) as the LED switch, then it will get worn out faster, as it's mechanical device.
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A transistor is definitely a better option for long term LED flashing. However, a relay can still be used for this, especially if it is made to oscillate at a low frequency.
Of course your are right, I just wanted to point that out, as I destroyed one of relays by rapid LED flashing(about 100Hz), so you won't make similar mistake as me.