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[Reply #30 on:]

Just for fun, here is a set of 3 multiple TLC5940 examples.

The first is an ATmega168 w/ 2x TLC5940's running off 3 "AA" batteries (missing 6 LEDs due to no space).
The second is an ATmega168 driving a custom board with a pair of TLC5940's.
The last example has a board with an ATmega168 w/ 1x TLC5940 (w/ 1x LED) connected to another board w/ 2x TLC5940's.

I even did a lousy video (no audio, fan noise?) also http://youtu.be/DT54VHR94eo

Make sure you change NUM_TLCS in tlc_config.h... I spent several hours re-checking my wiring because I'd forgotten that I'd changed tlc_config.h on my laptop install, not my desktop.  So when I ran BasicUse the LEDs on the 2nd TLC5940 would light at random.

You can tell if you've made a mistake with NUM_TLCS when not all the LEDs are lighting with BasicUse but the fade is still smooth with no "gaps" (times with no LEDs fading).

Double-check your wiring and you should be good to go.  Then follow Demonic69's advice and try a tlc.setAll(4000) (followed by a tlc.update) to make sure you can light everything at once.

FWIW,

Brad (KF7FER)

[Reply #31 on:]

Oh wow! Yea, I'm still working on it.  I'm trying to figure out whats wrong with the code by using just 1 tlc5940.  Once i get that, i'll update it to support another tlc5940.
Thx

[Reply #32 on:]

I've got a working 8x4 setup with 2 TLCs. If you want to post your latest code I can test it out for you if you like mate.

[Reply #33 on:]

will do, I will send that over when i get home from classes.  My laptop doesn't have the code, but my desktop does.

[Reply #34 on:]

Hello.

I know its been a while although I've gotten the Atemega328p standalone and am using a 3.7 v lipo battery to run that along with 32 leds that are driven by 2 TLC5940's.

I'm using the Fades example with 5v into analog 0 and I have an issue where the first 16 leds fade properly but the second set of 16 leds blink all funky. 

Any suggestions?                                                                                                                                                                                                                                                                                                                                                 

[Reply #35 on:]

I'm using the Fades example with 5v into analog 0 and I have an issue where the first 16 leds fade properly but the second set of 16 leds blink all funky. 

Any suggestions?                                                                                                                                                                                 

I've seen that happen when I have more TLC5940's than defined by NUM_TLCS.  I'd double-check that value just in case.

FWIW,

Brad.

[Reply #36 on:]

my NUM_TLCS value is at 2, and i'm using 2