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Max The Magnificent
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Cow and Horse Manure
Max The Magnificent   4/25/2014 2:29:29 PM
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As an aside, while I was writing this column, my inventer friend Brian LaGrave dropped by my office with his two sons (Sam and Daniel) bearing gifts -- two large plastic coffee containers -- one loaded with cow manure and the other loaded with horse manure.

I'm going to be using these materials in my experiments to age the brass panels I'm using in my Inamorata Prognostication Engine

betajet
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What's your data rate?
betajet   4/25/2014 3:01:47 PM
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The obvious first question is "what's your data rate?"  I2C is pretty slow: it was originally designed for passing control information between digital components in early TVs with digital chips.  OTOH, I2C is very forgiving electrically: I2C components include input filtering so it doesn't matter if your SDA and SCL are ringing.  This is nice if you're going between boards.

SPI can run much faster, but you have to ensure good signal integrity on your clock.

If you're running very slow, you might consider UART.  Then you can debug each board separately using a terminal emulator on a PC.  You need to get a USB to UART dongle with the correct voltage for UART signals for your board.  Here's one from Adafruit http://www.adafruit.com/products/954.

You can also get dongles that talk I2C or SPI and talk to your boards individually from a PC, or monitor what's happening on the line.  However, then you have to write I2C/SPI code on your PC which could be a steeper learning curve than using your embedded boards.  Still, here are some cables from FTDI: http://www.ftdichip.com/Products/Cables/USBMPSSE.htm.

Max The Magnificent
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Re: What's your data rate?
Max The Magnificent   4/25/2014 3:13:24 PM
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@betajet: The obvious first question is "what's your data rate?"

Do I look like a man who has a clue? My first-pass philosophy is to make it "go like the clappers" LOL

betajet
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Re: What's your data rate?
betajet   4/25/2014 3:31:00 PM
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Max wrote: My first-pass philosophy is to make it "go like the clappers" LOL

I guess you need Gigabit Ethernet then :-)  Use fiber fibre optics, then you don't need to worry about having a common ground earth :-)

Max The Magnificent
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Re: What's your data rate?
Max The Magnificent   4/25/2014 3:33:47 PM
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@Betajet: Use fiber fibre optics, then you don't need to worry about having a common ground earth :-)

No need to try to find the right words -- I'll have you know that I'm bilingual -- I speak both English and American!

 

betajet
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Re: What's your data rate?
betajet   4/25/2014 4:50:36 PM
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Yeah, but I had to look up "go like the clappers" even though I'm sure you recognized my real name as English, albeit with 'Mercan spelling :-)

 

jstabler
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Re: What's your data rate?
jstabler   4/25/2014 4:54:50 PM
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I noticed in this blog and your Golden Ratio blog you mention an alternative to Bodacious Acoustic Diagnostic Astoundingly Superior Spectromatic (BADASS)dislay, the BIGASS display. What do these letters represent?

Max The Magnificent
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Re: What's your data rate?
Max The Magnificent   4/25/2014 5:02:13 PM
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@jstabler: ....the BIGASS display. What do these letters represent?

Arrgghh -- it must have been my subconcious projecting again (all those bacon butties aren't doing my figure any good) -- I changed it to BADASS -- good catch -- keep up the good work!!!

Max The Magnificent
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Re: What's your data rate?
Max The Magnificent   4/25/2014 5:04:51 PM
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@betajet: Yeah, but I had to look up "go like the clappers"...

That's why my blogs are so efficacious (dare we say "puissant") with regard to maintaining your interest LOL

Duane Benson
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Semi-custom might work too
Duane Benson   4/25/2014 5:14:16 PM
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You could also utilize SPI, but use it in your own custom way.

First, wire it all up as though it were an SPI, but don't put the Arduino Mega or ChipKIT pins into SPI mode. You can use the pins as GPIO for your handshaking.

The ChipKIT can set one of the lines to indicate data is ready. The Mega can poll that line when it has spare cycles. Then after the handshaking indicates everything is ready, switch the pins on both sides to be SPI and transfer the data. Switch back after the transfer.

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