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1  Development / Suggestions for the Arduino Project / Re: Arduino Board with Parallax Multi-Processor Chip on: April 21, 2014, 04:04:15 pm
"Mind you the number of people who have told be that they have one but have never used it because they can't work out what to do with it are legend." Count me as one of those guys.  Even have a few 'Cobblers' for it. I do however, like demonstrating my $29 tiny computer surfing the web. But I've never done any physical computing with it.

I still like DUE. I hope Arduino continues to develop it. They left some spare I/O and the Ethernet on the table. Hopefully, they break that out in a future versión one day. Wish Atmel had given us a Little bit of epromm memory with it as well.

YUN, Galileo and TRE look complex and expensive.
2  Using Arduino / Project Guidance / Re: Aquarium Monitor on: April 21, 2014, 03:38:43 pm
Have a look here:

http://forum.arduino.cc/index.php?topic=140740.0

Automated Reptile Control Center. He's doing things very similar to what you want to do....minus the wáter.

This is such an incredible Project, it's almost required reading for anyone developing an aquarium/terrarium controller with advanced logging and visualization capabilities.
3  Products / Arduino Due / Re: Small-footprint Due on: April 18, 2014, 11:30:44 pm
Will you consider breaking out the Ethernet?
4  Using Arduino / Project Guidance / Re: Cost sensitive project. Considering ATTiny85 with ATTiny84 option. on: April 18, 2014, 02:19:32 pm
Folks,
I've sourced ATTiny84A in bulk at sub $1 a piece costs ...shipped.
Now to pick up a programmer for this guy and learn about it more thoroughly.
It's advertised specifically as the ATTiny84A SSUR...  Guess I'm going to have to learn how to work with this format.

This pricing was from Digikey, so it's not an instance where supply could be suspect.


(Looks like ATTiny85 is not needed (I have a mess of them in DIP8 format... oh well good for students)).
5  Using Arduino / Project Guidance / Re: Cost sensitive project. Considering ATTiny85 with ATTiny84 option. on: April 18, 2014, 01:32:34 pm
Got it Robin. Did my best to add some context to the replies that follwed the first post.
6  Using Arduino / Project Guidance / Re: Cost sensitive project. Considering ATTiny85 with ATTiny84 option. on: April 18, 2014, 11:48:46 am
Lefty,
That's exactly where I'm at....
I'm redesigning this portion (annunciation panel) of the product... Previously, I was using a $3 Arduino Pro Mini Clone. Took up too much space in the enclosure.... and drove up costs.
Our volume will be small for a while..so there will be a bit of bench top soldering by myself and a few others. Fewer components to mount the better.
7  Using Arduino / Project Guidance / Re: Cost sensitive project. Considering ATTiny85 with ATTiny84 option. on: April 18, 2014, 11:24:31 am
OK,
I reread my original post. I could not have written it in a more confusing manner had that been my primary objective from the onset. I really appreciate everything that all of you have written so far.  So let me try again.

#1... everywhere ATTiny44 appeared, should have been ATTiny84...

Let me put it in reverse.
I have a Product based on the ATTiny84...
I have 5 switches feeding it. The switches should make in a given pattern. Using a microcontroller permits me to do error checking for stuck switches or improper operation.
Different combinations of switches will illuminate different LEDs to indicate the operation. I have 6 LEDs (one is power, always on, 2 must be able to pulse).
Without multiplexing or using resistor networks, I need the pin count of something like the ATTiny84. It's size fits the package as well.

However, I see a greater opportunity to remove two switches, two LEDS and reduce conductor count through my cable and produce a lower cost alternative. These changes alone result in a BOM savings of about $3..  
My thought was.. perhaps I could substitute the ATTiny84 (which has a cost of about $2.25 in bulk) with an ATTiny85 (which has a cost of about $.91). That would result in another $1.30 saved on the BOM...
That's a total of $4.30 saved (plus some labor). This yields a real world reduction of cost at the retail level of about $13. That's pretty compelling and ultimately the lower cost model would outsell the higher cost ítem 10 to 1... I would then bump the cost of the higher end ítem to realize greater profits from those customers who dont' mind paying more to have more. So there is a place for both models...one a higher volume... one a higher profit..

Hence, my question about the ATTiny85 substitution for the lower end model. And yes..the sketch would be nearly the same.... but I'd produce seperate ones.

The real question is.... CharliePlexing and Resister Networks.... Occurs to me it could add component cost (material and labor) to the point that it erases allot of the benefit of the ATTiny84 to ATTiny85 substitution.

Paul, Resistor network is easy (and quite clever).. I'll educate myself on CharliePlexing.

Other Paul, I'll look at the Internal Pullups of the ATTiny84/85. Starting to feel like two different PCB designs for each useage scenario...
8  Using Arduino / Project Guidance / Cost sensitive project. Considering ATTiny85 with ATTiny84 option. on: April 17, 2014, 10:45:41 pm
Folks,
OK... I rewrote the question below... after several of you responded.... so look for my response a few lines down.... but I've been asked to paraphrase some of what I wrote before so that the comments folks offered to me made sense... Sorry all, I was foolish to delete this first post in this thread...it's a disservice to the community to try to intepret responses to content that has disappeared.

The original idea was to develop a single pcb that would fit a higher end and lower end implementation of my product. This thread is only dealing with the remote annunciator panel portion of my product... which is smaller than a Tin of Altoids Mints. (My switch/sensor array is much more complex..and I've taken as much cost out of it as posible (5X reduction)).

Lower end would use ITTiny 85, Higher end would use ITTiny84 (I mistakenly wrote ITTiny44 in the original post).

I also mentioned using pulldown resistors on my board.. not knowing the ITTiny84 and ITiny85 implemented internal pull-up resistors. Have not worked with either before... but pretty sure they fit what I need...

The comments folks posted below were to help me:
1. reduce component costs (internal pullups)
2. use the same ITTiny85 for both units.

The original write up was confusing because I presented the product as a stretch (to the ITTiny84), when in fact it's a shrink (to the ITTiny85).
9  Using Arduino / Project Guidance / Re: Multiple Due/Uno Project. Best Network/Comm Topology for Distributed Control. on: March 19, 2014, 02:37:10 pm
Rob,
I was part of the guys that tried with the Tiajuino. Guess, I should pick that effort up again.
I sent two of those boards down under like a year ago I think.

ZoomCat..  Yes I intend one to act as a master and the rest slaves.

I suppose a handful of Ethernet Shields is the way to go.... just need to work out the compatability with a couple of other shields, especially those that need the SPI.
10  Using Arduino / Project Guidance / Re: Multiple Due/Uno Project. Best Network/Comm Topology for Distributed Control. on: March 14, 2014, 05:14:43 pm
Two arduinos have motor shields. one has an lcd shield. one has a GSM shield...
So, I'll have to wrestle with sheild compatability issues if I put an Ethernet or Wireless shield on..

Haven't decided on a wired or wireless solution. Speeds not an issue, so even some kind of multidrop serial network would suffice. Just don't know of any such peer network protocols for Arduino.

(if only the DUEs  had implemented the native Ethernet of the SAM3X chip and included a full PHY brought out as a RJ45 header...I'd migrate every Project to a DUE and connect them all via Ethernet.).



11  Using Arduino / Project Guidance / Re: Multiple Due/Uno Project. Best Network/Comm Topology for Distributed Control. on: March 14, 2014, 11:36:14 am
Clarified what I was looking for above.
12  Topics / Education and Teaching / Re: My Arduino documentation to share with others on: March 12, 2014, 06:13:50 pm
This was very nice of you to share!!

I'm at the planning stages of opening a MakerSpace here in Alamos, Sonora, Mexico. Anthing we build that requires a heart/brain will use Arduino. Material like this is really helpful.

Do you have any objection to us making Spanish translations of this material? (of course we will make it availble to all.).
13  Using Arduino / Project Guidance / Multiple Due/Uno Project. Best Network/Comm Topology for Distributed Control. on: March 12, 2014, 04:16:57 pm
Fun Project. Have 7 or 8 UNO/DUEs each doing their own thing independently. Looking to coordinate a few activities between them.

What I'm asking for are recommendations for the best Network/Comm Topology to apply to allow for some Supervisory Control, Distributed Control and Data Acquisition between the Arduinos. I will have special purpose shields on each UNO/DUE, so I need to adopt something that I should be able to apply universally to each 'Node' on my 'Network'. Some sort of Peer Networking recommendation, with perhaps an example.

I'm not ready to adopt any Galileo, Yun, Tre, Rpi technologies. Just want to go with what's available in the UNO/DUE community.
14  Topics / Science and Measurement / Re: Colorimetric CO2 Analysis on: March 04, 2014, 11:28:12 pm
Have you considered one of these?

https://www.atlas-scientific.com/product_pages/sensors/env-rgb.html

Very nice product. Simple serial interface with sample code for Arduino.
I have one and I've verified it sees Red, Green, Blue...

Peter
15  Products / Arduino Due / Re: Arduino Due Programming Language - Graphics Support on: March 03, 2014, 01:25:15 pm
Have a look at this effort:

http://forum.arduino.cc/index.php?topic=164788.0

Due GUI.
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