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31  Forum 2005-2010 (read only) / Interfacing / Re: diagram (4 sparkfun button pads max7221) on: February 09, 2008, 04:01:30 am
i hooked the led columns and rows tonight to the 7221 as in the diagram and everything works great, had one cut trace but that was easily fixed.

now to get the shift registers going.
32  Forum 2005-2010 (read only) / Interfacing / Re: Anyone done a sound reactive led/input on: February 07, 2008, 12:07:30 pm
my knowledge is limited, but an audio amp would work, possibly just a preamp.

i would look at a lm386 based amplifier, however you could also look at using a transistor as an amplifier they can certainly do that. then just read the voltage on the analog pins, you will get a value between 0 and 1024 that corresponds to 0-5v, you can set the threshold manually to turn the led off and on, similarly you could use pwm and pulse the led brightness accordingly smiley-grin

33  Forum 2005-2010 (read only) / Exhibition / Re: SD card read/write with Arduino on: March 30, 2008, 09:45:12 pm
excellent, given the fat / sketch size limitation ... could you fit the sd/fat library on a atmega, then interface that chip with simple commands via i2c?

like have a master arduino and a slave arduino, the slave only handling sd/fat interactions.
34  Forum 2005-2010 (read only) / Exhibition / Re: Conway's game of "Life" on: February 15, 2008, 02:23:14 pm
i can hear your arduino saying "i need buttons!"
35  Forum 2005-2010 (read only) / News / Re: ATxmega on: March 11, 2008, 03:42:57 pm
is there a concern they aren't going to? what alternatives would take over?
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