I love those tiny AVRs. This is a very nice project I will probably try out myself some time.

Posted at 8:24 am on Jun 27th, 2009 by mosfetkiller

Very cute!

Posted at 8:29 am on Jun 27th, 2009 by Tachikoma

Using the clamping diodes to power the AVR via the coil? Amazing. Absolutely amazing. I’m floored by the creativity and simplicity of this hack. This is truly what hacking is about!! =)

“An engineer can do for $5 what a fool can do for $20″

Posted at 9:13 am on Jun 27th, 2009 by eric

I would so not be happy if I was one of the people with an RFID in my hand to operate my car/house locks.

Next build a business card PCB with the surface mount version of that chip and the antenna etched in copper.

Posted at 10:14 am on Jun 27th, 2009 by nubie

This is the most awesome thing I’ve seen in three months.

Posted at 11:42 am on Jun 27th, 2009 by macegr

fantastic

Posted at 11:42 am on Jun 27th, 2009 by tikka

I’ve noticed the back powering effect but I’d never though to intentionally run a device with it, not to mention pulling clock pulses directly from the receiver coil.

This is the best hack I’ve seen in a long, long time.

Posted at 12:35 pm on Jun 27th, 2009 by Wolf

Come on bobz,
This is not the place for apocalyptic bible thumping. Hackaday is about technology and sharing of such information. Lest you assume me to be just another cretin, let me assure you, I know exactly where that scripture originates and the apparent fulfillment does not escape me. This fact does not necessitate trolling.

Please take it elsewhere.

Posted at 2:12 pm on Jun 27th, 2009 by John

don’t you normally need to tune the antenna to the carrier frequency (by using a capacitor in parallel to the coil)??

i wonder how good is the range with just avr+coil version? i guess a capacitor on power pins would increase the range quite a lot.

You could also use smd avr and smd coil to make it even smaller.

Posted at 3:52 pm on Jun 27th, 2009 by Lupin

Finally, something NOT TWITTER. And a real hack, taking advantage of technology. Awesome

Posted at 4:36 pm on Jun 27th, 2009 by Josh

Lupin: The AVR’s silicon die already has some capacitance; I suppose all it takes is a rough guess what the capacitance is and find a matching coil for it.

Posted at 11:22 pm on Jun 27th, 2009 by Tachikoma

I am high as a tree now, so here an easy target target but I trow a lot of grenades

Posted at 12:23 am on Jun 28th, 2009 by tree

id have to say that this prob one of the coolest things I have ever seen. An ‘unpowered’ avr and an inductor…brilliant. How did you even think of it ?

“hm..im bored, lets see what happens if I stick this inductor here..and lets pass it through a 125Khz magnetic feild”

is that how it went down ?

Brilliant !

Posted at 1:31 am on Jun 28th, 2009 by efox

interesting…
could also be handy for powering “smart” tags that can log environmental data using ambient light, and then be read back wirelessly.

Posted at 1:44 am on Jun 28th, 2009 by conundrum

If you power the AVR then you can brute force a RFID reader. If I had a AVR programer I’d try it.

Posted at 2:53 am on Jun 28th, 2009 by Hackius

5 stars hack
i did also notice the power by the i/o, but always see it as a drawback.
genuine genius, you shoud request a patent for that

Hack a Day, more like this please

Posted at 12:02 pm on Jun 28th, 2009 by timour

timour patents cost a lot of money. This idea is very good but special rfid chips cost much less

Posted at 12:50 pm on Jun 28th, 2009 by therian

simply ingenous!

Posted at 5:49 am on Jun 29th, 2009 by t

Fuck all people who use US quarters for size comparison, hope they die in a fire already, I’m sick and tired of it as you might have surmised at this point.

Posted at 6:56 am on Jun 29th, 2009 by Wwhat

Yeah!

They should use Chinese Yuan for a change!

Or something.

Posted at 7:08 am on Jun 29th, 2009 by Tachikoma

therian, i mean a patent for the supply without a dedicated supply pin.

Posted at 8:46 am on Jun 29th, 2009 by timour

so we could have cpu with only 2 pins, like a resistor in a 0805 package

Posted at 8:51 am on Jun 29th, 2009 by timour

Minimalistic, awesome, pure creativity, just brilliant. You must be very proud of this kind of beautiful ideas!! My most sincere Congratulations.

Posted at 3:24 pm on Jun 29th, 2009 by bluesman

timour patent on diode or 1wire ? lol

Posted at 4:13 pm on Jun 29th, 2009 by therian