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How to create an adjustable fade in/fade out circuit for 27 LEDs? Answered

https://www.instructables.com/id/Romantic-LED-Heart/ I would like some input on creating this using POTs to create an adjustable fade in/ fade out effect on the 27 LEDs while running on a 9v battery if possible.


Josehf Murchison

5 years ago

Oah crap I got to do this again something messed up the first time I tried to say this.

Yes it can be done in a number of different ways.

The first way, you can use a pic ( Programmable IC).

The second way you can build a 555 timer.

To drive a up down counter.

To drive a digital pot.

To drive a LED driver.

It is simple to do and hard to describe but it is not that hard to do if you can read a schematic.


5 years ago

Put them in series strings of six LEDs with a 100 Ohm resistor on each string.

Connect that to a 100 Ohm 0.25W pot.