nice project. how long does it take to charge the supercap running off the usb?
That IS true….
IF… they were BJTs,
They’re not in this case, they’re actually NMOS mosfets, eagle doesn’t have a good SOT-23 mosfet package, so i use a NPN SOT-23 because i’m lazy. However, you are correct, you ALWAYS want a base resistor when using NPNs
good project! looking at the schematic I think you have to put resistors between the bases of the transistors and the controller, for example between T1 and RB4; 10k or so will be ok
Once i get another revision out(soon), i have no problem releasing the board files!
This is pretty neat! Would it be possible to release the eagle source files instead of/in addition to the PDF schematic?
I had about 12042993490 different ideas for generating random numbers, although this a psudo-random algorithm, the data doesn’t lie, its a fairly random routine. I like the idea of amplifying white noise and using that as a bit stream as a seed >.> You can use the on board comparator on two analog pins and it should be fairly random, doesn’t require and extra hardware.
This is really cool! If it was me, I would use a humidity sensor on the back to get a real environmental random number for doing the calculations, obviously its not very necessary but I like to nerd out hard lol :P
I found your website very interesting.
Very useful projects and ideas.
Thank you very much! From my experiences I’ve always used JTAG for ATmega and ISP for ATtiny. Regardless, ISP programming with the AVR is still a frustrating experience since you need a high voltage programmer to reset some of the fuses. So if you use an ISP programmer, set the fuses wrong you’re SOL. I still prefer the PICKIT vastly over anything AVR offers.
I will update the article, thank you very much for your advice however.
*bangs head on desk* the most frustrating aspect of any AVR chip is programming the damn thing.
There is no one programmer from ATMEL that will program all their chips.
This is definitly not true. Every AVR supports ISP programming. U can use one single programmer to program all AVR devices. ATmega devices do support JTAG programma, this is additional to ISP programming.
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