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Hi, so after this post : http://arduino.cc/forum/index.php/topic,158983.0.html I tried to make my motor via the motor controller works

Here were my connections : PA, PB and EA to three of arduino pins
                                             + to 5V arduino
                                             - to its ground
                                              B+ and B- to my external alimentation (12V,8A)
                                              Motor to M1 and M2
when i gave the code to the arduino ( it was simply based on a digital digitalwrite HIGH on EA and two analogwrite and EA and EB.) the D2 had a red color and like 2 second after i turned the external alimentation on, my computer suddently shut down and now i can't get any display from it anymore, wtf ? Isn't the USB port supposed just to turn off itself and then that's all ?
 
I may take it to the after -sales but can someone explain me what happened ? I've read the manual long before turning everything on :  http://www.robotshop.com/content/PDF/user-manual-s-h.pdf .

What have i done wrong ?

Thanks for answers !!


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I looked at the data sheet briefly but see no mention of a voltage regulator that puts the +/- pins at 5 volts dc.  What voltage do you measure at those pins?  In fact is specifies that the + pin is for output to an EXTERNAL regulator so it looks like  you fed your 12 volts to an input pin 'post regulator' and simply overwhelmed the whole board.
« Last Edit: April 14, 2013, 04:58:35 pm by outofoptions » Logged

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Ok so i don't really understand what are these two pins for ? if i use something else than an arduino?

So what should i have done ? No arduino alimentation, just ground on the - ?
You think i burned it and it wont work anymore ? And arent the usb ports on my computer supposed to be protected against this ?

I'll measure this tonight, thanks for your answer smiley
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USB ports don't have much protection - certainly not against over-voltage.  They usually tolerate too much
current being drawn from the computer's 5V, but that about it.
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Ok so i don't really understand what are these two pins for ? if i use something else than an arduino?

So what should i have done ? No arduino alimentation, just ground on the - ?
You think i burned it and it wont work anymore ? And arent the usb ports on my computer supposed to be protected against this ?

I'll measure this tonight, thanks for your answer smiley
Just the ground would be fine.   If  you want to run the Arduino from it you would have to put it back into the barrel jack so that it goes through the regulator.  Is t ruined?  Don't know.  Plug it in and see but it doesn't sound good.   I don't know about USB protection but suspect the previous poster is correct.  They protect against what they expect an errant device would do with a short circuit at 5 volts being the worst.  You supplied 12 volts capable of 8 amps.
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Alright, so i'm back to home, i tried it and it works with just the ground...

At least the motor and arduino aren't blown.

I'm really stupid having connected this 5V pin to the motor controller smiley-sad Paying my lack of english skills at reading stuff !

Thanks for your answers and sorry for the disarrangement smiley
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My motor board has a regulated output.  Obviously you have to be sure of your particular parts though.  Glad that board survived anyhow.
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