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31  Using Arduino / Microcontrollers / Re: Need some advice on a multi-chip project on: August 30, 2013, 07:49:17 pm
OH!

see I was reading 4 remote pod's at the back of each device, feeding back X distance to a central location (though like a twisted pair connection)

your running RS232 to a central location and the rest is on board

well dang dude, you can do that on perf board if you keep your signal lines from being in parallel or crossing other lines at 90degrees

I think the worst your going to have is messing with the arduino stuff to work at 18Mhz, but even at 16Mhz the very slight offset doesnt really effect anything, I have an apple II with some asm magic gets up to slightly under 115,200, and a avr board at 16Mhz slightly above 115,200 and they never have issues talking to eachother (I would know its a hard disk over serial emulator)
32  Using Arduino / LEDs and Multiplexing / Re: Star Trek Computer Help on: August 30, 2013, 07:14:25 pm
do you have a breaboard?

if not you sould pick one up, they are fairly cheap and you can just plug stuff into them to make what you want, from there you get some chips, the one I mentioned or better yet the suggested TLC5916

once you have hardware then setting up software would not take too long, it could be up and running in a couple of weeks including waiting for the mail

then there is option B ...yea you could get someone to do it for you, but what about the next prop? you are subject to getting someone else to do it when you could do it yourself

back to design, how are you thinking of doing colors, a bunch of different color LED's, which gets into another topic (cause different colors require different maths), or all the same white LED's and gell's in front of the holes?

something to think about
33  Using Arduino / Microcontrollers / Re: Need some advice on a multi-chip project on: August 30, 2013, 07:10:28 pm
I was not that confident, but the more interesting this is how far are we talking about

thats the thing what exactly are we talking about, bell wire strung in between who knows what devices with sticky tape on the wall?

that is a grossly exaggerated vision of what I had

so maybe some clarification is needed?

and yea we string higher speed signals all over the place all the time, but its typically not the core clock of a remote device, heck I dont even know what happens if an avr gets a wonky clock, double beats, skips or gibberish on its clock lines
34  Using Arduino / LEDs and Multiplexing / Re: Star Trek Computer Help on: August 29, 2013, 11:26:00 pm
in order to drive that many led's you may want to consider 3 of these (24 led's)

http://www.digikey.com/product-detail/en/TPIC6B595N/296-1956-5-ND/277601

and reading over

http://www.arduino.cc/en/Tutorial/ShiftOut

the TPIC6B595N is a "high powered" version of the basic 74HC595 listed in the tutorial, in a nut shell you send it all your on off data, flip a switch (another arduino output) and boom
35  Using Arduino / LEDs and Multiplexing / Re: Star Trek Computer Help on: August 29, 2013, 11:16:35 pm
do you already have an arduino? if not which one are you considering?
36  Using Arduino / Microcontrollers / Re: Need some advice on a multi-chip project on: August 29, 2013, 10:54:56 pm
the finished product is not the goal -- the design is.

I deal with design a lot, its my current thing, and from what I gather being on a production floor with tons of electro-mechanical crap switching constantly is not how cool I can make it, its how isolated can I make it, cause the electrical noise floor is though the roof, just something to consider depending on your environment.

there's something to be said about KISS. Independent isolated devices that communicate though a robust situation, or a robust communications situation connected to a central device sounds more like a bullet proof design to me.

In a past life I was a network admin, so I get it, your whiz banging signals at 100+ mhz over silly twisted pair unshielded connections over hundreds of feet, or bouncing wifi off a steel poll to redirect it to a terminal in BFE, but there's a ton of overhead in order to do that (ie how many packets do you loose during a given time period, with sync clocks you cant loose 1 single bit)

not saying it cant be done, not saying you cant do it, just saying, one day this stack of domino's is not going to fall 100% perfect and you may not notice it until that data is needed, and when you do a failure analysis, its though the roof and you have to rethink things

what do you save for that future headache?  a 0.5% tolerance 16 mhz ceramic resonator can handle 115200 baud just fine and cost 47 cents each, no other parts required, and it wont freak out if someone flips a light switch between point A and B
37  Using Arduino / LEDs and Multiplexing / Re: Star Trek Computer Help on: August 29, 2013, 09:55:11 pm
I see your dilemma, but what is your question?

where to start? something specific?  smiley-mr-green

PS: you are going to hate having a sound module do the effects and recording it on camera, its better to do that in post process, even the TV show did that

why? well look at that youtube video, it may be awesome in real life, but on the video its mostly high pitched squaks recorded in a room

PS:PS: welcome aboard, you are going to have fun here being a creative type
38  Using Arduino / Microcontrollers / Re: Need some advice on a multi-chip project on: August 29, 2013, 09:29:57 pm
synchronizing clocks is rather pointless outside of novelty,  SPI has its own master / slave clock arrangement, and RS232 is async
39  Using Arduino / Microcontrollers / Re: Need some advice on a multi-chip project on: August 28, 2013, 12:13:09 am
the 2313 is a very limited chip in terms of ram (128 bytes), and if your stringing clock signals all over the place (which should be interesting and very error prone) IMO I would look at a mega which is 1 chip, with 4 serial ports and 8k of ram and 1 shield
40  Community / Bar Sport / Re: Latest chip you smoked? on: August 25, 2013, 11:39:12 pm
yea I killed a NI boost controller, worked fine until it started shooting blue sparks between a couple of pins

the data sheet had a list of all the pins that were a max of 5 volts, except for one which we dropped 12 into, which apparently made it go nutty on its output

oh well, for the record the TI controllers are much nicer, the only way I have killed one of those was firing it up with no load or zener on its output, but it just failed gracefully
41  Using Arduino / Networking, Protocols, and Devices / Re: connect usb keyboard to arduino uno using female pin on: August 25, 2013, 12:47:27 pm
usb is much more complicated than ps2 requiring usb host support via a shield
42  Products / The Arduino Starter Kit / Re: New to DIY Electronics - Need Equipment Suggestions on: August 24, 2013, 07:30:40 pm
yea it looks cheap, but its totally fine for getting started cause it doesnt take much to get things done in electronics
43  Using Arduino / Project Guidance / Re: ATmega328 Bootloader? on: August 24, 2013, 01:15:41 pm
look at your boards.txt in the arduino install, it will tell you what file it uses for the bootloader
44  Using Arduino / Project Guidance / Re: 3x5 led matrix on: August 22, 2013, 11:09:12 pm
just like a tv, you only put one led on at a time, but you do it so fast your eye sees the entire picture
45  General Category / General Discussion / Re: Power an Arduino through another on: August 22, 2013, 09:49:20 pm
as long as you connect grounds and do no exceed the current capabilities of your supply (which usb is 500ma) yea its fine
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