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[on:]

Fellow Arduinians,

my Arduino NG worked fine yesterday when i uploading the LedBlink sketch with LedInt set to pin 0 / rx to check out if a transistor was hooked up correctly.

But now it keeps telling me the programmer is not responding. What could be the case?
After an extensive search for several hours i could not figure out what it is.

Actions i have taken.

- changing boud rates.
- checked for right serial port
- changed usb cables, changed usb slots.
- playing with reset button and upload time alot.

But again, at first it was running beautifully. So my basic question is:
        is there a way to go back to factory defaults?


Regards:  Maarten, the enthousiastic newb.

[Reply #1 on:]

What do you have connected to pins 0/1?  These pins are used for programming and may need to be temporarily disconnected from your circuit during programing.

[Reply #2 on:]

it was connected it with a buz 10 transistor..   then i noticed that it has to be used for serial traffic, and should be disconnected during transfer. So i did.

my concern is that the pins purpose now has changed ( ? ) and it is blocking traffic.

could this be the problem?

[Reply #3 on:]

As long as there are no electrical circuits connected to pin 0/1 (with some exceptions) and you press the reset button just prior to uploading a new sketch (within a couple of seconds).  The code of the prior sketch should not effect the uploading of a new sketch.

Given that, I have noticed that occasionally I can not upload a new sketch after some tests.  This has always gone away for me with a power reset on the arduino (disconnect from the computer) although occasionally it has required a restart of the computer as well.

[Reply #4 on:]

Power resets, different cables, different ports, it all doenst matter..   when i hit Upload, the orange lights  shortly blinks once. and then comes the error.

I cannot image that i a the only one with this problem. There must be someone else assigning pin 0 to something..  if that is the cause.

now can somebody please tell me HOW TO CLEAN IT UP? Reset, Format, Clear, Flash, Delete, Refresh, Start all over again.

[Reply #5 on:]

If there's nothing connected to pin 0, that shouldn't be the problem.  At least, once you reset the board, the configuration of the pin is reset.  I suppose it's possible you've blown the pin though.  What was connected to it?  

What error do you get when you upload now?

[Reply #6 on:]

Ok, resetter than the reset button isnt possible..


There was a transistor connected to it with 12 volt going through.  
Ive measured that the pin keeps spitting out around 5 volts constantly. So it isnt completely dead either.

 i get:

Programmer Not Responding, RESET the board right before exporting.
Programmer is not responding. .

Ive experimented alot with combinations in timing with pressing reset and first it worked fine. so that should not be it..    . .

thx in advance!

[Reply #7 on:]

Mellis was right...

I consulted my schools technical dude, we exchanged the microcontrollers, and guess what, mine is dead. His is alive,

i fried the microcontroller, however, the rest of the board is still operating properly, so im looking at buying a new chip.
I used an electromagnet in my circuit, and the coil gives a big peak when turned on. his advice was to install a diode over the magnet.

always nasty to learn stuff the hard way,

anyway: Thank you all!

maarten

[Reply #8 on:]

I've always found the hard way to make the best lessons!  

When selecting the diode be sure to pick one that can handle 500-1000V (low amperage),  even small inductive loads can send voltage spikes that measure in the hundreds of volts!

[Reply #9 on:]

Can you post a drawing of what you did?  I'd be curious as to what killed the chip.