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Topic: LED Birthday card. (Read 2374 times) previous topic - next topic


Nov 27, 2010, 11:37 am Last Edit: Nov 27, 2010, 11:49 am by o0Mouse0o Reason: 1
It is a friends birthday tomorrow and like the typical bloke type I forget to get her something special. And its the end of the month with big bills arriving so an extravagant shopping expedition is not possible.  So yesterday I had the idea of returning to my childhood solution which was to glue some junk together and blag the 'I made it specially for you' excuse :)

Because I'm lazy the I used a spare mobile phone charger rated at 5.5 Volts and 800 mA. This way I don't need regulation components or battery boxes or even batteries. I used a Atmel8 with Arduino boot loader burnt on it because you can buy them for about £1 and I have a box of them for this sort of project. I programmed it in a standard Arduino and then swapped it over to the custom PCB.  I also used a bit of code I wrote for a Knight Rider type LED scanner that uses software PWM as there were not enough built in PWM channels for that project. The PCB was milled on my Proxxon MF70 that I recently converted.

So in summary everything on this project was from the junk / spares box!

I am using the free version of Eagle so am limited to about 3 by 4 inches on PCB size. The Proxxon Miller also has a limited area for larger work.

My soldering leaves a lot to be desired, maybe I'll ask for a good soldering iron for my next birthday ;)

The bare minimum, A crystal, Reset tied to +ve and the power supply is taken care of as it will be powered from a 5 Volt mobile phone charger wall plug unit.

The layout was a squeeze!

This is the finished gift, should look good hung on a wall or illuminating the inside of a bin  ;)
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Nice job.    

Anyone should be happy to receive a gift that took so much to put together.  Money pales in comparison to what you did here.


Wow! That's impressive! A lovely thought for a birthday card / present.
Maybe I'll have to build myself one for my birthday?
:) :) :) :) :)
My website: http://www.harryrabbit.co.uk/electronics/home.html Up and running now! (Feel free to look round!) :D


Mouse, this is a pretty awesome gift unless the girl can do the same as you did. So, is this girl married?   ;)
Serial LCD keypad panel,phi_prompt user interface library,SDI-12 USB Adapter


So, is this girl married?

Yea, to an awesome friend.   :P


Yea, to an awesome friend.

Haha, that's still cool! I'll make my wife one for sure. Do you know of any insulating transparent/translucent jell that I can use to embed the circuit board into (make the shape of a heart :) )
Serial LCD keypad panel,phi_prompt user interface library,SDI-12 USB Adapter


Thats an idea, I was planning on having a simple perspex front but didn't have time.
Maybe worth experimenting with bathroom / DIY silicon sealer. I've noticed that most of the clear stuff goes opaque or 'misty' when its set.  ;)
I'm sure a small heart shaped jelly mould with some grease on it for releasing will finish it off a treat.

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