I bet nobody has given you a business card before that actually dials you up by itself! Read on to find out how I did it ....

Do you like making things? Do you do it for money, or would like to? If so, you need a business card. These can be your best advertising, but we all know business cards are boring and get thrown away. I have toyed with plastic or etched stainless cards before - these are really cool, but cost a lot, and are not really distinctively "you".

Do you make goods out of leather? Then make a leather business card. Do you make handmade greeting cards? Then make your business card look like one of these! Even better, make one that is actually useful for whoever you're giving it to, so it CAN'T be thrown away. I'm into making electronics, so what better way to advertise my skills than an electronic business card. Here are two experimental "extreme" business cards that are almost impossible for someone to throw away - one in the form of a key ring torch and one card that actually dials me up by itself! This one has a computer inside with more processing power than took the first astronauts to the moon (No, I'm not kidding!), yet the main part costs less than 50 cents. I'm also working on one that plugs into a USB port on a computer so that people can email me directly from a link, or look at a portfolio of my work.

Even if these ideas don't grab you, maybe they'll fire your imagination to think how you could make a truly unique card that uses your skills and tells people how creative you are.

Step 1: The Torch

I won't kid you - these two cards need some serious construction skills, and are both experimental (particularly the dialler), so are no beginners projects, but wait 'til you see the face of the first person you give one of these to! Don't try these designs unless you have successfully made a few electronic items before - they need good soldering skills, and ideally a way of making some printed circuit boards, although if you soldering skills are REALLY good, and you are making just a few, it is possible to make versions of both of these cards without circuit boards, and just "point to point" wiring - my prototypes were done like this.

Firstly the torch. This is the easier of the two. Although you could use some PVC cards to enclose a hand-wired version (keep reading on to see this technique used in the "dialler"), making copies is much easier with a proper PCB. A tutorial on how to make a PCB is beyond the scope of this article, but if you haven't tried it before, it is a really good technique to be able to do and opens up a countless variety of electronic projects. Here is an instructable on a simple toner transfer PCB - personally I find more repeatable and professional results with the photographic method - couldn't find an instructable for this one, but there is plenty of info on the web - I use a very cheap 500W halogen light from the local hardware store to expose mine for a few minutes, and then develop, etch and tin. If there is enough demand, I might get some universal "torch" and "dialler" boards commercially made.

Anyway, assuming you can get a PCB made up, the file which I used is included below - this can be modified on a standard graphics package. If you can't read EPS files, then try the 300dpi bitmapped version included below as well. You can of course use a specialised PCB package, but I wanted an unusual cursive font on mine, so just hand-drew the design on a graphics package. This allowed me to incorporate my name into the actual circuit board - the electric current actually goes though my name! If you want to produce a reasonable batch, you will probably want to tile your image over the page after you have made your changes.
amazing idea you should patent it thank you
hi you have the beginning of the idea , billions of business card are printed on paper each year but something is missing here to make it a world wide market but please free to contact me ( I am living in France ) I just has a wondurfull idea but I am not into electronics ( but I do have tech knowledge as a end user) <br>Richard <br>+336 25 21 21 21 send me a sms and will return you a valid email
Make: posted a video about a year ago of how you can make your own custom PCB's using the photographic method http://www.youtube.com/watch?v=tWnfnt2rNO0<br><br>-TheWaddleWaaddle
The Autodialling Business Card is just an insanely cool idea!!!<br><br>Thanks for sharing.
If the chip can be programmed to say something like "I am diabetic" with brief first aid instructions or an emergency number either spoken or programmed to dial, I could see this as a great emergency aid.
i think the problem is that pic chips have a couple of kilobytes of memory if that. so generating more complex sounds would use a lot more memory, might have to have it external or something.<br />
Aren't there those cards where you can save a message and when you open them it plays the message? They aren't that expensive, and you could have the whole thing independent from the PIC itself.
Actually, as a single guy who dates a lot, this would have other uses ! :) Hey... Marvellous instructable. Thanks !!
Truly and utterly baffled by the ingenuity of your design.<br>In one word, fascinating.
You should do a site like cardnetics! You have great ideas!
im thinkin for a cheap way to do that thing wid a usb in it is to buy 64mb flash drives in bulk put ur info on it then crack the case and put it on the card if u wanna or just get them custom engraved for a bit more
They arn't thin enough<br>And i dont think that they make 64 mb anymore
What about using a reed switch so when you put the card near the magnet in the phone receiver it dials (semi-)automatically?
Great 'ible., but I think someone will write an &quot;app&quot; they can: email, bluetooth or otherwise transmit to a smart mobile.<br /> <br />
&nbsp;well how about a credit card form factor usb key, such that the recipient can plug it into their computer? &nbsp;A mobile app would pop up that allows the user to send an email to a predefined address, and connect a voip call over pc?<br /> <br />
This is great, because if I was a potential client, I'd be tempted to call you just to see it work. :o&nbsp; I imagine you sometimes get callers who introduce themselves&nbsp;as &quot;That is AWESOME&quot;<br />
&nbsp;I've&nbsp;subscribed to you. Your&nbsp;awesome!&nbsp;&nbsp;
your IQ must be 250 <div id="FLASH_MESSAGE" style="display: none;">&nbsp;</div>
I&nbsp;enjoy this comment thoroughly.&nbsp; <br />
does this actually dial numbers??
Ha! thats awesome. Just make one for everyone you know, file them and you never have to look up a phone number again!!!
for the dialer try to use a transistor to amplify the signal from the microcontroller and use a single 3v cell... i would recommend a 2N3904 as it is so common; connect the base to where the piezo + used to be, the emitter to the piezo +, and the collector to the + of the battery. i didnt see a schematic so it might be the other way around, but this should work.
It's not really the current that's needed but the voltage ands we are already feeding in close to the maximum voltage we have - piezos draw almost no current, so the only way to increase the audio output is to increase the voltage - either by using another cell or by a step-up circuit.
in my understanding, a transistor here will amplify the voltage however, if not, then a simple smt inductor should also work. original design was pretty clever about this stuff though
A transistor can only amplify a voltage up to the level of the power supply. Here we are essentially feeding the piezo with a 3V (or 6V with two cells) square wave already. Didn't go for the inductor idea as it was hard to keep a thin card with an inductor-based step-up supply and it was simpler and cheaper just to add another cell. Certainly if you were able to do this however, the piezo would be much louder and more able to put out a decent DTMF signal - piezos can often be driven with up to 50V or more to increase the volume.
well that is true. Your way works great, no complaints there. Nice work
very clever
Three words "Rejection Hot line"
you need to patet it so no one copies
This is so badass. Thank you so much for doing a tutorial, it's really neat!
On the card: If you have any problems press here. *sets the number to 911*
Perhaps a small hole on the back of the card, aligned with the hole on the piezo disc, would permit better conduction of sound from the card.
But it wouldn't look nearly as cool, now would it?
Well, you can't really see the hole in the corner, which I suppose is the point. But, you do want it to work as well!
But there must be some way to make it work better, yet still look as cool.... Hmmmmm.... I wonder.... I've got it! Turn it into a robot flying death-ray UFO machine, and put the speaker in its mouth! Perfect!
Hmmm, I think the goal of this project is to win clients, not annihilate them from the face of the Earth.
But what if you could do BOTH!!??!!??
I like your thinking! What if the speaker instead said things like "BUY MY PRODUCTS OR BE ANNIHILATED!". And if they didn't comply, - BOOM! Destruction! Lasers! Cool sound effects! Hmm...
Now that would be one business card I couldn't help but take from the little dispenser thingy.
I made one of these, and use a really fine, plastic screen over the ring, which concealed it, and still let through the sound.
thats a lot of work for a business card
insane and absolutly amazing =oO. would love to have a go at that but i wouldnt have the 1st idea when it came to programing it, would like to have seen some back and side pics. top job dude<br/>
Yeah - must take a side pic - it really just looks like a strip of white that is 3.2mm thick. Back I didn't put on because it is just plain white!
Hi Tom, The company I work for could make these easily. In fact I would be interested in helping you design the least expensive and thinnest card. I am thinking of making a bunch for the CES show in Vegas as a give-away. We would injection mold these. Of course I would give you all the glory. Smart design!
Go for it, but don't underestimate the amount of work this design still needs if you really want to make it work properly as stated in the article - getting accurate DTMF recognition from an audio system just a couple of millimeters in thickness is not trivial, and will require quite a bit more development work. Good luck, though and look forward to seeing what you come up with!
by-the-way contact me at: fkern@c2p-inc.com www.c2p-inc.com
are you going to sell that??? if so, please tell me its price
As mentioned in the instructables, the design needs some improvements I think before sold commercially, and unless a company was interested in ordering a large amount of these, it would be hard to justify the extra development expense - this one is more of a proof of concept.

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