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1  Community / Gigs and Collaborations / Re: Help develop a new stackable development system on: Today at 12:59:56 am
Update.

After a few changes, much procrastination, other priorities, and cold feet about spending money the PCB design is ready for manufacture. We've found a bloke in the UK to do PCBA of 4 prototypes so that should get started soon.

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Rob
2  Using Arduino / Project Guidance / Re: what is E and M in motor shield on: April 22, 2014, 11:37:05 pm
How would we know? What shield are you referring to?

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Rob
3  Products / Arduino Due / Re: Anyone using CMSIS? How to get started? on: April 22, 2014, 06:31:49 pm
Quote
one letter makes all the difference
Sure does smiley

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Rob
4  Products / Arduino Due / Re: Doubt about the Serial port Arduino on: April 22, 2014, 12:33:19 am
You don't need to fool around with interrupts, the Serial library does everything for you.

But you do need to provide TTL->USB hardware for the second serial port or it's just talking to thin air.

That begs the question, why do you need two USB connections to a PC?

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Rob
5  Products / Arduino Due / Re: Anyone using CMSIS? How to get started? on: April 21, 2014, 03:47:23 pm
These days there's almost never a need for ASM, most (probably all) of the hardware is available to a C program and the code that does this will normally boil down to a single ASM instruction anyway.

There is sometimes a reason to delve into ASM if you really have to control the exact order of instructions etc, but it's been years since I've even thought about doing that, even with fast comms programming.

The last time I used ASM was for a monitor program that displayed all the CPU registers, program counter, stack pointer etc. and these days I doubt many people need a "monitor" program or indeed even know what one is smiley

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Rob
6  Using Arduino / Networking, Protocols, and Devices / Re: Protocol fails on: April 20, 2014, 06:07:24 pm
Why are you printing all those "0x" and ";" ?

Anyway the problem is that the Arduino print functions have no provision to print leading zeros. Have a look at using the sprintf() function, that will allow you to create a formatted string in an array and then you can print the array.

Do you need to display with the 0s? Because if not it's still valid for program use, just move on to the real purpose of your program.

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Rob
7  Using Arduino / Programming Questions / Re: Adjusting simple (so it should be) shift register coding for a different result on: April 20, 2014, 04:18:51 am
So do you want the LEDs to go like this as you rotate the knob from 0 to full.

Code:
********  // fast anti-CW
-*******
--******
---*****
----****
-----***
------**
-------*
--------  // stop
-------*
------**
-----***
----****
---*****
--******
-*******
******** // fast CW

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Rob
 
8  Using Arduino / Networking, Protocols, and Devices / Re: what is the best protocol to connect more than 512 devices to an arduino?? on: April 19, 2014, 11:00:35 pm
I think you will have trouble using any bus with 500+ loads hanging off it.

How fast do you need to update the nodes?

Can you split them into a few groups?

What about daisy-chaining as that has no practical limit to the number of nodes (or the distance between them depending on the speed required).

Does it have to be a single motor per node? Can you say have 4 to reduce the number of nodes to 128?


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Rob
9  Using Arduino / Programming Questions / Re: How do I move a sequence through an array? on: April 19, 2014, 10:52:03 pm
Quote
I strongly support the method suggested by @DavidOConnor in Reply #1.
+1

There's almost never a good reason to physically move bytes around in C.

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Rob
10  Community / Gigs and Collaborations / Re: Project - Will pay for completion on: April 19, 2014, 10:46:55 pm
Does it have to be a real book? If not you can place all the mechanism inside a fake one and push/pull against a fixture at the back of the book shelf. That will not require any access to the rear, drilling of holes etc and will be 100% hidden.

Of course if the object is to allow you to then remove and use the book that's a different story.

This is why people need to know everything about a project.

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Rob
11  Using Arduino / Programming Questions / Re: Understanding Interrupts on: April 19, 2014, 10:35:35 pm
You can use them wherever you like. No need to include anything, they are part of the core.

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Rob
12  Using Arduino / General Electronics / Re: blackout circuit - 300ma cc circuit on: April 19, 2014, 10:16:43 pm
Firstly, what are you talking about.

Secondly, all that and you still have 145uA "leakage" current? Wouldn't a low-side FET be easier and better as well?

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Rob
13  Using Arduino / Project Guidance / Re: Automatic plant watering system on: April 19, 2014, 10:04:51 pm
Something like this I would think

http://www.ebay.com.au/itm/Ultra-quiet-Mini-DC-12V-3M-240L-H-Brushless-Motor-Submersible-Water-Pump-New-/231021868292?pt=LH_DefaultDomain_15&hash=item35c9f9f504

It's 12v though, any reason you can't use 12v?

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Rob
14  Using Arduino / Project Guidance / Re: Automatic plant watering system on: April 19, 2014, 06:48:29 pm
Quote
Would a pump like this fit the bill?
That pump looks like it's designed to be mounted directly onto a tank, much like the car windscreen washers we talked about before. In most situations that would not be appropriate as it's a lot easier to connect a pump with proper in/outlets.

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Rob
15  Using Arduino / Project Guidance / Re: Senior Project Multi-Processor Arduino Board on: April 19, 2014, 06:31:05 pm
Yeah I remember talking about doing that.

Using FIFOs or DPRAM would just be a fun thing to play with, total overkill for a dual AVR board though, a bit like having the Nürburgring or Daytona to yourself and doing laps in a Prius.

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Rob
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