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16  Community / Bar Sport / Re: Your latest purchase on: May 05, 2014, 06:14:30 pm
I can't think of any way to make this Arduino related, but what the heck.

I just bought some blacksmithing tools and I plan to set up a space for them, somewhere I can teach myself more about this craft (I have done some before).

Why? I really need a hobby that has nothing to do with computers or even electricity. I'll always be "into" embedded electronics, but a bloke needs some perspective and I've spent too many years sitting on my arse looking at computer screens.


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Rob
17  Using Arduino / Programming Questions / Re: Having issues using an Arduino to emulate a shift register. Details inside. on: April 30, 2014, 05:28:46 am
Quote
A very important mistake to have made (Not connecting ground)
Arguably the most common problem we have here, why we didn't ask about this I have no idea.

Looks like it's working now.

I reckon we should distribute a logic analyser to all forum members, it would cut the number of questions in half smiley

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Rob
18  Products / Arduino Due / Re: Small-footprint Due on: April 29, 2014, 03:43:17 am
Quote
mounting holes. These would increase the size of the board by 30%
How about having mounting tabs like the board on Gogol's Kickstarter link, they can snap off if not wanted.

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Rob
19  Using Arduino / Programming Questions / Re: Convert Characters (A,B C) to Number (1,2,3) Characters are sent from Processing on: April 28, 2014, 07:07:18 pm
Assuming you got 'A' from the serial port then

Code:
x = Serial.read();
x = (x - 'A') + 1;  // () not really required

will give you an ID of 1 if that's the required relationship and it seems that it is. This translates to

65 - 65 + 1

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Rob

20  Using Arduino / Sensors / Re: Seperate IC to Count Pulse Input? on: April 26, 2014, 06:38:12 pm
One of our members did a board with 4 (I think) tiny85s (or maybe 84s) whose job it was to do high-speed counting. There all talked to the master mega2560 with SPI.

I'll see if I can find the thread.

EDIT:
This is the thread, http://forum.arduino.cc/index.php?topic=69358.0, I didn't re read it to see if there are any details but I know that's what he did because I helped off line with it.

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Rob
21  Development / Other Hardware Development / Re: 8MB Ramdisk (external RAM) for Arduino.. on: April 24, 2014, 08:08:30 pm
Join the club, too many projects and too few years smiley

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Rob
22  Using Arduino / Networking, Protocols, and Devices / Re: I2C over RS422 using MAX485, will this circuit work? on: April 24, 2014, 07:07:08 pm
Quote
As the receiver is always enabled I would say that this circuit drives itself as soon as SDA went low once.
Yes I think that's right, looks like a feedback loop to me.

Any reason not to use the I2C buffer chips? If you need > 50m there are versions that split the SDA and SCL signals into separate lines so you can use RS-485 or other drivers, the PCA9600 for example.

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Rob
23  Development / Other Hardware Development / Re: 8MB Ramdisk (external RAM) for Arduino.. on: April 24, 2014, 06:48:23 pm
Quote
I've been "dreaming" about a mini-card like this with a SAM3X on it.
There's a current thread about one being made, I can't find it now though.

EDIT: Found it, http://forum.arduino.cc/index.php?topic=233091.0

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Rob
24  Community / Gigs and Collaborations / Re: Help develop a new stackable development system on: April 23, 2014, 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
25  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
26  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
27  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
28  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
29  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
30  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
 
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