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16  Using Arduino / Project Guidance / Re: G Code on Arduino? on: July 26, 2014, 07:57:19 am
I think GRBL uses most of the MCU memory so adding a SD card read routine will probably not fit in the memory (not to mention the other problems you may have).
Can you just have another arduino with SD card and a button(s) and knock up a simple program to read a file and send it over serial to the GRBL arduino (obeying xon/xoff handshaking).
A nano/pro mini would probably be more than enough and after adding an SD card and a couple of buttons would take up no more space than an UNO.
17  Using Arduino / Programming Questions / Re: Trough Detector on: July 26, 2014, 02:58:37 am
  pinMode(transistorPin, OUTPUT);
  transistorPin = 9;
Using transistorPin  to set pinMode before it is defined to a value?
18  Community / Website and Forum / Re: Forum Font on: July 26, 2014, 01:44:12 am
Another font related issue is the size on some pages, The attached screen capture shows what I mean. If this was on a mobile/pad the text would be unreadable at this size.
19  Community / Website and Forum / Change forum online status on: July 26, 2014, 01:41:43 am
Once upon a time I could change my online/offline status for the forum but cannot find the setting to do this any more. Has it gone or am I missing it?
20  Using Arduino / General Electronics / Re: PCB schematic on: July 26, 2014, 01:31:06 am
In the IDE go into the preferences and select verbose output for upload, try uploading again and cut/paste the output here.
It looks like the chip is not what the programmer was expecting but the verbose output should help to be sure of this.
Have you disconnected the LCD while trying to program just in case it's interfering?
21  Using Arduino / Project Guidance / Re: Re Using Latch pin connected to shift register 595 as input pin on: July 26, 2014, 01:06:32 am
Can't even see the image properly for a number of reasons.  You seem to have lodged it on some utter garbage "image hosting" site which obfuscates it - my security system prevents it being displayed.
I though the OP had forgotten to post the schematic as nothing show up for me either.
22  Using Arduino / Project Guidance / Re: Re Using Latch pin connected to shift registor 595 as input pin on: July 25, 2014, 10:01:19 am
You can always change the fuse settings to use the reset pin as another I/O but understand you will loose the ability to use the chips ICSP and will need a high voltage programmer like this to reset the fuses to allow program changes to be uploaded.
23  Using Arduino / General Electronics / Re: What is MCU STC15L204 Wireless Development Board? on: July 25, 2014, 07:42:32 am
The STC15L204 is converting the NRF24L01+ wireless to/from a UART serial data.
24  Using Arduino / General Electronics / Re: Looking for a collection of schematics for learning on: July 24, 2014, 11:47:34 am
Have a look at documentation for the Sparkfun Inventors kit, it covers basics of most things new users are likely to connect.
25  Using Arduino / Networking, Protocols, and Devices / Re: Receiving UDP and sending Multiple UDP packets on: July 24, 2014, 11:40:20 am
Not had a good look at your code but maybe worth using a freemem tool to see if your malloc/free commands are fragmenting memory. Might be better to have a fixed buffer just bigger than the largest packet your likely to receive but do checking to ensure you don't get buffer overflow.
26  Using Arduino / Networking, Protocols, and Devices / Re: SPI AD9833 pin hookup on: July 24, 2014, 08:47:04 am
Out of curiosity I bought a AD9833 module (see picture) and cobbled together some code to test it  that is attached to this post. I hooked it up to a mega as per pinout in sketch and tested various frequencies using DSO scope that could only handle upto 4MHz. Hope this is of some help.
27  Community / Local Groups / Re: Boston, Lincs, UK i.e. the original ? on: July 24, 2014, 08:27:29 am
Well I live in the USA - but in this case it stands for "the Uther Side of Accrington"
To London we are all just northerners.
28  Community / Local Groups / Re: Boston, Lincs, UK i.e. the original ? on: July 24, 2014, 08:16:42 am
Directions are as simple as assembler...
get a plane to Heathrow
Drive north up the A!
turn left at Peterborough
Carry on till the end of the earth, carry on 15 more miles
Turn left and pray. smiley
No wonder your getting lost, I would suggest you use the A1 and turn right at Peterborough  smiley
For me it would be via the god awful A17. Look for a place called Beyond on google maps and I live at the back of it.  smiley-lol
29  Using Arduino / General Electronics / Re: PCB schematic on: July 24, 2014, 04:30:48 am
Looking at the schematic you supplied it has a 6 pin ICSP2 socket with each pin going to the correct place so you should be able to plug the 6 pin header of the programmer into it and the programmer should supply power and program your chip.
If your having problems then the LCD also uses pins 11 & 12 so may interfere with programming.
The sparkfun link you posted has links to how to setup the IDE for programming.

Unless you need a 16MHz processor speed you could reduce the component count further by removing crystal (Y1), capacitors (C1 & C2) & resistor (R2) and setting fuses to use internal 8MHz clock.
30  Using Arduino / General Electronics / Re: Simple question about ProtoShield on: July 24, 2014, 04:11:03 am
Also, are all the holes in the middle area connected in the same way a breadboard is?  I would like to solder connections from this IMU into the analog pins of the arduino.
The centre grid of holes are not quite like breadboard where you have rows of 5 connected to each other. They are all individual holes on that protoshield and it's up to you to link holes together as needed. A small section (bottom left of your original image link) have common pins. You can find protoshields set out in the same way as breadboard or ones that have a breadboard on them.
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