issue with 5490 perfboard setup

hello, world. long time listener, first time caller. i'm hoping right section.

a couple caveats:

i not engineer, nor play 1 on tv. thus, ignorant re. exact physics behind doing.

i not programmer, either, i've had luck arduino. hurray, arduino!

ok, here's issue. looking fade high powered (2.5-3.5v, .5w) leds tlc5940. have tlc5940 libraries, , have run code intend run (a variation on example sketch "fades") on breadboard. breadboard powered 9v wall wart running 7805 circuit smoothing caps etc, , although not own oscilliscope, told setup makes relatively smooth, noise-free ~5v power supply. have not had problems in past.

here's schematic:


the problem arose after finished soldering. i've built board had on breadboard, including power supply, basic 555 flip-flop switch controlling power arduino, , tlc5940 rigged per "hardware setup" pics here.

when hook arduino headers on board i've built , hit switch, 4.96v arduino. rest of board on same power circuit, not controlled switch.. , receiving 4.96v. lights, however, fail light thing... until fingers close gsclk (pin 3) wire coming arduino. when this, 5940 responds cycling first pin on , over. rest of -led pins on 5940 doing nothing according multimeter.

my thoughts on possible problems are..

1)i've made glaring error in schematic

2)when circuit powered on, 5940 receiving power before arduino turned on (via pushbutton).. when starts has no control signal. i'm not sure if problem, cycling power doesn't seem help, nor resetting arduino.

3)there sort of interference going on pinouts arduino 5940, pin 3. why begin turn on when close it? , why isn't running arduino sketch when close instead of cycling first pin on 5940?

4)pin 3 on arduino haunted, , needs life force in order job, albeit poorly.

i'm 5940 not dead, have traded them off working circuit on board. have no shorts on finished board.

i'd appreciate if out. arrgh.

~sprinkels

edit: it's 5940, not 5490 =p

well there's problem.

yeah. had loaded wrong sketch, apparently i'd saved 1 of ones didn't work instead of 1 did. problem solved.

i'd surely appreciate critique on schematic though, if bored =)

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