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This is the arduino powered time fountain i have been making. it uses a  water pump from the local diy shop and leds from there to the bucket was a freebee from some plants .
Hi - Arduino's PWM isn't capable of varying the frequency... only the duty cycle.. <br> <br>There are ways of varying the frequency via interrupts, ''bit-banging'' and messing with the clock -- however none gives you continuous control over the flicker rate....
which is necessary to correctly time the flash to the drops
and the rest of the info?<br>whats it do, how u make it, etc....
Here i made my own version with detailed instructions :-)<br><br><br><a href="https://www.instructables.com/id/The-Time-Fountain-Also-know-as-Magic-Fountain/">https://www.instructables.com/id/The-Time-Fountain-Also-know-as-Magic-Fountain/</a><br><br><br><br><br>Best Regards.

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