LED Heart for girlfriend.

[scott]

I want the LED to pulse, or at least flash.
I started working on the 555 timer circuit tonight for it. Its about halfway done.

note: the circuit is not yet on the board, so it looks like complete mess, bear with me, i have no breadboard.

only pic sofar:

[P3nnyw1se]

You could turn it into a keychain with an on and off switch so she could put it with her keys...just an idea, =D

[scott]

The heart is 5(1/2)" x 4" and containing 150 LEDs.

I doubt it would fit on a keychain.

[~:Dhruv:~]

Make a 15 led grid n then make a heart keychain , she'll love it more imho

[802Chives]

Whats the plan of attack?
Power Supply?
What are you going to use to switch the LEDs? Looks like you have some transistors?

Let me know if you need a hand, this is right up my alley.  Might even be able to come up with a .hex of a heart beating fading in and out

[scott]

It wont be programmable, I dont have a programmer and im using a 555 anyway.

Powersupply, either 6v or 9v

[phenoptix]

Have a look here
http://www.instructables.com/id/Build-a-binary-heart-decoration-Blinkenheart/
Pretty similar to what you seem to be trying to achieve.
There was another guy on that site who did a beating heart LED tshirt that no doubt impressed the lady in his life!

[scott]

I saw those. Im trying to stick to just using a 555.

If someone would like to program a different chip for me. That would be great.

[FOOKz™]

If you would like to get really complicated you could make the LEDs flash randomly with a 4017 CMOS Decade Counter.

Here is a Diagram i found for you:
*You Can Substitute the Schmidt trigger on pin 14 with your 555 Timer Clock circuit you already built.
https://homepages.westminster.org.uk/electronics/images/4017_08.gif