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1  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 13, 2012, 08:32:14 pm
@dc42: Yes, I have. They run all the way.

@boffin1: I'm doing what you said (the second one, when it worked) -- Have been from the start, but thanks for at least telling me not to try daisy-chaining them.

@Graynomad: I tried another, now it's being even weirder. The chip works. I know this because it's responsible for eight green and eight blue LED's, and the eight green ones work flawlessely. However, the eight blue ones have gone nuts. They're very dim (normally they're the brightest on the display) and only turn on fully once in a blue moon (excuse the pun). However, if I turn only a few LED's on at a time, they work. I don't know what to think -- The PSU is more than capable of running every LED at once (it could run six of these displays at the same time), they're grounded, wires are in just fine.. I don't know what can be causing this. I even added a 6th IC to see if those blue ones wouild mess up too, and it just gets weirder. The next 11 do, the the last 5 are fine. I'm thinking about scrapping the project entirely and designing a PCB instead.

@dhenry: I've been doing that.
2  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 11, 2012, 12:26:29 pm
Interesting, owo. Might have to go do that soon..

I have good news and bad news. The good news is, it's not the wires! Yay!

The not-so-good news is I found out by connecting the chip directly to the Arduino. Using the same wires that control the first four chips just fine, I put them to the fifth chip, and it didn't work.

I know from experience that any chip I put there won't work, so the breadboard must be at fault. I have no idea how or why -- I used a multimeter to test all the strips and they work fine. I didn't have to stick the probes in far (they didn't even fit into the holes), so it doesn't make much sense to me.. Though the chips do pop up, maybe it has to do with that even if they're stuck down.

Regardless, point is the issue can be tracked down to me having a faulty breadboard. Is there any way to fix this or should I just grab a new one?
3  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 04:48:10 pm
What is wire wrapping, exactly? I'm entirely self-taught here and pretty much everything up to now has been done by guess-and-check. School didn't even touch on this stuff so I'm sorry if I'm asking a lot of really basic questions.
4  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 03:25:53 pm
Blah. That bus idea ain't working. Is there a device that exists who's only purpose in life is to accept a signal and repeat it again to get rid of line noise? Given what I have on hand and my abilities, I really don't see a way to avoid using one.
5  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 02:57:48 pm
Where do I get that ribbon cable? I've been looking all over for that and the best I can find is discontinued IDE cables at Radioshack that I'm running out of. x.x
6  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 04:10:54 am
Didn't try shiftOut(), and I really have no idea anymore. My head's fuzzy, I've been at this for weeks now so I'm starting to skip over simple stuff (see hz/mhz confusion) and it's four in the morning so that ain't helping much.

I'll work on it some more later. I just gotta figure out some way to get the chips to stay in the breadboard now. Seems like taking two of the power rail bus type things off the breadboards and using them is working. Maybe. I hope.
7  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 03:34:57 am
Annnnnd scratch that. Broke again. Just the 5th chip. Since the 5th is on a different breadboard I had to use longer wires and that seems to have killed it again. Before it was connected directly but I was gunna run out of wire and space to plug stuff in. Maybe if I tore off the little +V and GND rails on the sides of the breadboards and used those..

I can't adjust the SPI clock -- I think the library does it at some point by its self. I decided to try "bitbanging" instead SPI just to see if it'd work (It says it's slower), but that seems to be too slow for the TLC's to accept.


Man, these things are /really/ sensitive..
8  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 03:04:33 am
I'm not sure -- Kinda hard to check now since it's working fine. Like I said though, the PSU isn't even the same for the IC's anymore. Got two PSU's, one just for the LED's, and it's helped a lot.

I know how to solder, but what do I do to make connections on a stripboard? Using wires sounds "wrong" and so does making long solder bridges..
9  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 02:38:17 am
Got'cha.

One other problem just popped up. Literally. The IC's are having issues staying in the breadboard. Sometimes one end pops up a bit, sometimes the entire chip pops out. Are there any tricks to keeping them in?
10  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 02:29:14 am
I knew that. I have some of those wires you linked to and I agree, they're far nicer than just plain stranded wire when you're trying to get them into a breadboard, but what carries a signal better?
11  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 02:19:47 am
Stranded's easier to work with, but is solid better for not running into the situation I was just in?

I might slow it down, I don't know if I can get this to reach all the way down to the end of my second breadboard.. Hopefully it'll keep up. I've already found out that 57600 baud is *barely* enough for 20 events/second and that's the fastest the software controlling it allows. How much slower would setting SPCR to 3 make things? Still enough for 57600?
12  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 02:06:36 am
I LOVE YOU GUYS. o_o...

I thought of doing a bus/star formation earlier but thought it was a stupid idea. I guess I severely underestimated how much wires can screw with data. It works perfectly now! Even my tests that do far more than I'd ever do when sequenced with music (Just constant events, no delays anywhere) don't throw them off now! Gosh. Wow.

For future reference, what kinda wire should I be buying? Larger or smaller gauge? Solid or stranded?
13  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 01:45:56 am
Ah. Okay, I can try that. I should have /just/ enough wires and a spare breadboard somewhere.. If that don't work I'll try changing the SPI's speed.

But what do I hook where? Do I stick the second transistor's collector to the first's emitter and tie the second's base to a constant +5v source?
14  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 01:37:45 am
I'll try getting transistors happy then, but it'd help if I knew what wires to stick where. I'm Googling stuff but it's bringing up not-so-useful results.

I can't control each IC directly. I'd need a total of 28 PWM pins to do that. (4 PWM pins per IC, 7 IC's).
15  Using Arduino / Project Guidance / Re: Daisy-chaining 7 IC's on: November 09, 2012, 01:28:31 am
...There I misread "hz" as "mhz". See above.

I don't have ten 2N2222's. Would it be 'kay if I mixed them with transistors of a different type that run at 150 hz? Or is that pushing things?
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