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16  Using Arduino / Microcontrollers / SD Card boot loader on: April 02, 2013, 06:20:33 pm
I am trying to get an arduino mega to be able to reflash itself from an SD Card with my chosen sketch precompiled for it.  There was previously an effort to do it and they successfully did do it, as long as the chip is a 328.  I am trying to port this over to the Mega 2560 running at 8Mhz.  Can someone help me out please?

What is left of the project is here

http://arduino.cc/forum/index.php/topic,99837.0.html

However the project seems to have stalled.  More frustratingly they had support for the 2560 was on the roadmap.
17  Development / Other Software Development / Reflash Arduino mega directly from SD card on: April 02, 2013, 06:13:20 pm
I am trying to get an arduino mega to be able to reflash itself from an SD Card with my chosen sketch precompiled for it.  There was previously an effort to do it and they successfully did do it, as long as the chip is a 328.  I am trying to port this over to the Mega 2560 running at 8Mhz.  Can someone help me out please?

What is left of the project is here

http://arduino.cc/forum/index.php/topic,99837.0.html

However the project seems to have stalled.  More frustratingly they had support for the 2560 was on the roadmap.
18  Using Arduino / Programming Questions / Re: Flashing a sketch from SD card using 2boot bootloader on: March 27, 2013, 03:43:08 pm
I am using a 2560v running at 8Mhz so the whole board is running at 3.3v so I have no level shifter.  The SD card is connected directly to the SPI lines.

https://www.sparkfun.com/products/10744
My board is one of these with an W5200 Ethernet module attached. (Same way as the W5100)
19  Using Arduino / Programming Questions / Re: Flashing a sketch from SD card using 2boot bootloader on: March 27, 2013, 12:42:37 pm
Hi, I am very interested in this project and I would like to get involved.  In addition make it compatible with the 2560.  Can someone tell me where it currently stands what the latest builds are etc?
20  Using Arduino / Programming Questions / Re: Change password and IP on: March 15, 2013, 12:11:47 pm
Also why do that on the device?
Use DHCP and then config IP etc it on the router.
21  Using Arduino / Programming Questions / Re: Arduino Mega2560 Rev3 on: March 15, 2013, 12:08:00 pm
Move this to programming advice.  Your code needs to be optimised!

From a quick skim of your code you should just have it check to see if it should unlock in a while loop with no delays.  Then only run the relevant code for that.  Seems like there is excess bulk.  Break it down to the bare minimum and it will run quicker.
22  Using Arduino / Motors, Mechanics, and Power / Re: Current limiting and overload protection on: February 20, 2013, 07:11:07 pm
Hi Lefty,
Thanks for the reply. 
The motor will likely be between 12V and 18V with a 3A or 4A current.  It will be a brushed DC Motor.  I am planning on putting everything on a custom PCB so deciding whether I want to integrate everything to reduce costs or us pre made controllers.  I am leaning towards a single integrated module though.  I was thinking of using MOSFETs for control of the motor, a thermistor for temperature, but I am not sure how to check current.
23  Using Arduino / Motors, Mechanics, and Power / Current limiting and overload protection on: February 20, 2013, 10:24:25 am
Hi,
I have been trying to find out how to create a solid state current limiting circuit for an electric motor.  Is there any way to do this reporting the current to the arduino?
24  Using Arduino / Programming Questions / Re: W5100 Ethernet shield and TLC5940 on: February 20, 2013, 10:12:36 am
Glad you got it working.
25  Using Arduino / Networking, Protocols, and Devices / Re: Changes to external ip on: February 20, 2013, 10:08:27 am
Your Router is given an IP address by your ISP.  Then your router will give all the devices it is connected to an IP address.  Your internal devices will be given the following over DHCP;
Internal IP address
Router IP address
DNS Server IP address
Subnet Mask

Your device is never given an external IP address.  In order to get that you must either request it from your router OR connect to an external server which will then tell you the IP address that the request came from.  Your entire network at home will have ONE external IP address.
26  Using Arduino / Programming Questions / Re: W5100 Ethernet shield and TLC5940 on: January 26, 2013, 07:33:15 pm
That link I gave you was to change the chip select pin of the ethernet module.  The other option is try running the ethernet begin command after turning off the tlc
27  Using Arduino / General Electronics / Re: external feed or PC feed ? on: January 22, 2013, 07:50:16 am
Your power supply may not be powerful enough.  Also the arduino is an AVR dev board NOT and industrial PLC replacement.  Please be aware of this!
28  Using Arduino / Programming Questions / Re: W5100 Ethernet shield and TLC5940 on: January 21, 2013, 06:48:50 am
Other option change the SS pin on the ethernet shield.  Will require a bit of modification to the shield.  http://arduino.cc/forum/index.php/topic,118265.0.html
29  Using Arduino / Programming Questions / Re: W5100 Ethernet shield and TLC5940 on: January 21, 2013, 06:41:21 am
According to the library.

Code:
SS will be set to output as to not interfere with SPI master operation.
    If you have changed the pin-outs and the library doesn't seem to work
    or works intermittently, make sure this pin is set correctly.  This pin
    will not be used by the library other than setting its direction to
    output. */

Therefore you should just be able to connect both to pin 10 and everything should still work

Otherwise
Code:
#define TLC_SS_PIN       PB2
to
Code:
#define TLC_SS_PIN       PB1
(pin 9)
30  Using Arduino / General Electronics / Re: Help identifying the following connector. on: January 21, 2013, 06:36:13 am
I am planning on building a custom power adaptor for the controller.  So I need a way of connecting to it.  I guess I am gonna be stacking PCBs
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