Show Posts
Pages: 1 [2] 3 4 ... 9
16  Using Arduino / Project Guidance / Re: Another Orbit Yard Watering valve question. on: May 29, 2014, 10:00:03 pm
there is a nominal water pressure required so that the valve 'throws'.....

many, many moons ago I tried using these types of valves to drain a tank.... a very shallow tank... hence no head pressure and the valve would not throw.

however, for a water supply situation... that's different.
17  Using Arduino / Project Guidance / Re: Dog Toy Dispenser on: May 29, 2014, 09:53:26 pm
Apparently, someone made one of these in the past.... called KongTime.... But I think the falling ramp is a simpler design.
18  Using Arduino / Project Guidance / Re: Dog Toy Dispenser on: May 29, 2014, 09:26:13 pm
Look here:

If your Kongs will roll nicely

... like those cans.. then you can use it. Maybe a rail needs to be raised on one side to compensate for the uneven shape of the Kong..?
You just need something to boot the Kong off the edge.... some sort of lever controlled by a servo.... That's it.
19  Using Arduino / Networking, Protocols, and Devices / Re: Can I use this ethernet header with arduino? on: May 29, 2014, 08:24:51 pm
No you wouldn't. You need to purchase a shield or adapter... They can be had for as little as $5usd to $10usd.
20  Development / Other Software Development / Re: Cosa: An Object-Oriented Platform for Arduino programming on: May 29, 2014, 07:57:19 pm
I've really enjoyed following your work with this one! First rate!
21  Community / Products and Services / Re: The Zero is upon us! on: May 21, 2014, 03:22:40 pm

There is a link on the Main board.

Microcontroller ATSAMD21G18, 48pins LQFP
Operating Voltage 3.3V
Digital I/O Pins 14, with 12 PWM and UART  
Analog Input Pins 6, 12-bit ADC channels
Analog Output Pins 1, 10-bit DAC
DC Current per I/O Pin 7 mA
Flash Memory 256 KB
EEPROM up to 16KB by emulation
Clock Speed 48 MHz

I'm not able to use the BLOG and the FORUM simultaneously on my WIn7/IE11 machine. So, I haven't seen the BLOG comments.  (I don't want to go through the whole LogIn/LogOff F12/Clear Stuff.. scenario 4 or 5 times to finally get logged back into the Forums)

Doing some research on the ATSAMD21G18A which is the fully loaded version of SAM D series in the 48pin package. The ATSAMD21J18A has more I/O thanks to it's 64 pin layout, but none of that can be realized in the UNOs footprint. Looks like a decent chip. The D21J18A part could make possible a Mega-Like ArdinoZERO utilizing the 64pin version, but only having a single row I/O header at the back (instead of the MEGA and DUEs dual).

Has the same 1.8v and 3.3v operating characteristics of the ATSAM3X8E.

It will be interesting to learn how the EEPROM emulation works for storing things like calibration data. Looks like you'd write one sketch to configure it using the NVMDriver Config.... Then your development sketch would have the Memory Available.? Too bad the ATSAM3X8E of the DUE can't offer that.

It will also be interesting to see how similar it is to DUE in terms of IDE integration, libraries and coding methodologies. They are both ARM, but the Cortex M0+ is based on ARMv6 (uses Thumb-2 ISA), where as the Cortex M3+ is ARMv7M based (but also uses Thumb-2 ISA).
22  Products / Arduino Due / Re: Arduino DUE Booard Model DUE R3-E on: May 21, 2014, 03:06:06 pm
I searched the web for info as well, and could not find anything.
All of my DUEs simply report: Board Model Due R3.

Visually, is there anything different? Can you see if any new lines have been brought out from the native Ethernet interface of the ATSAM3X8E? Ok.... so I'm just indulging in a bit of wishful thinking that the E stood for Ethernet.
23  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.
24  Using Arduino / Project Guidance / Re: Aquarium Monitor on: April 21, 2014, 03:38:43 pm
Have a look here:

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.
25  Products / Arduino Due / Re: Small-footprint Due on: April 18, 2014, 11:30:44 pm
Will you consider breaking out the Ethernet?
26  Using Arduino / Project Guidance / Re: Cost sensitive project. Considering ATTiny85 with ATTiny84 option. on: April 18, 2014, 02:19:32 pm
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)).
27  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.
28  Using Arduino / Project Guidance / Re: Cost sensitive project. Considering ATTiny85 with ATTiny84 option. on: April 18, 2014, 11:48:46 am
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 there will be a bit of bench top soldering by myself and a few others. Fewer components to mount the better.
29  Using Arduino / Project Guidance / Re: Cost sensitive project. Considering ATTiny85 with ATTiny84 option. on: April 18, 2014, 11:24:31 am
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 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...
30  Using Arduino / Project Guidance / Cost sensitive project. Considering ATTiny85 with ATTiny84 option. on: April 17, 2014, 10:45:41 pm
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'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).
Pages: 1 [2] 3 4 ... 9