Connection problem

Hi,
i'm just building my prusa i3 but i've have some problem with the connection between arduino and PC.
Yesterday when i try the Ramps seems that all works fine... i have plug only one stepper, the termistors and the hot end. I'm try to connect to the arduino with pronterface and i'm able to move the X axis and read the temperature of two termistor, but when i'm trying to turn on the hotend ( set to 180°) after the turning on of led the connection has been lost. After some second of waiting i'm trying to press the reset button, but from that moment i'm no longer able to re-establish the connection.
If the ramps is removing the connection between arduino and pronterface works fine, but if the shield is mounting it don't work.
I'm trying to reflash the marlin firmware on the arduino but nothing to do!

There's a way to solve this or i've burned my ramps? in that case is possible replace the part or i should by a new one?

PS: sorry for my english.

RDWare

What baud rate are you using?

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Waitaki 3D Printer

the faster... i don't remember the exactly rate but is the faster in the list and before the test of hotend it works.
However i've try also with other baud rate but nothing to do

Some configurations struggle with a baud rate of 250,000. It would be worth setting the baud to 115200 in your firmware and Pronterface and see what we get.

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Waitaki 3D Printer

what i've to do for set the baudrate in the firmware? i've the marlin firmware but i don't know what i've to change

It's in configuration.h, near the top..

>>>>>snip

// This determines the communication speed of the printer
// This determines the communication speed of the printer
#define BAUDRATE 250000

>>>>>snip

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Waitaki 3D Printer

Today the arduino seems to work for few minute then has stopped.

I've try with another arduino ( new and never used ) with baudrate to 115200 and it works fine... i've try also at 250000 and it work but then i've reset it to 115.200,
All good "it works" I thought... i've set the stepper, the end switches and try the first extrusion for test all works fine! But after 20/25min of tests the printer has disconnected... i've turn off the psu unplug the usb and the start up again, it work for some minute and then the same problem i've try other 2 time and every time it disconnet from the pc in less time,and now i have the same problem. If i plug the ramps on arduino it don't connect with my pc... i don't know what i've to do!!!
Some helps?

Edited 2 time(s). Last edit at 05/07/2014 04:52PM by rdware.

It's i strange thing... the port was recognize but when i try to connect pronterface remain with che only row "connecting" in the log...

Maybe try another USB cable.

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Waitaki 3D Printer

Try the best quality USB cable you have and keep it away from motor wires and power wires

Solved! Was the cable!
Thank you!