The Arduino MEGA I got had and issue with automatic reset during sketch upload. The error message in the Arduino IDE looked something like this:
<pre>avrdude: stk500_getsync(): not in sync: resp=0x00 avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51
I had to hit Reset button just before uploading a sketch. This issue was due to some sort of defect in the Reset capacitor. The fix is very simple: just solder a 100nF capacitor on top of the defect one.
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Hi
I have a DFROBOT Arduino Mega (identical to arduino mega specs) with auto-reset problem, but it’s a bit different in RESET_EN location, I do not know where to solder the 100nF capacitor.
I’d appreciate any help.
Thanks.
Can you send me the link to the board schematics or a photo of the board? I might be able to help you out.
http://www.droboticsonline.com/media/catalog/product/cache/1/image/5e06319eda06f020e43594a9c230972d/a/r/arduinomegaforstore1.jpg
hi
I have the same problem auto-reset \ and every time i want to run a new sketch I have to press reset botton for a while and maybe it works or not
my best regards for who can help me
I’m not 100% sure whether this is the case, because I couldn’t find the schematics of the board for Roboduino MEGA, but it seems similar to the Arduino MEGA.
http://www.arvydas.co.uk/wp-content/uploads/2010/03/Roboduino-mega-reset-fix.jpg
In the image above I marked two rectangles showing where you should solder the 100nF cap on top of the faulty one.
LMK if this helps :)
Hello!
It works!!!!
You saved my day man!
I have a complete circuit on a stripboard with Mega, everything is tangled up. And I cannot upload my sketch. Uh..shi** it thougt. I have to do it again – i thought i burned or short circuited the Mega somehow.
And then I followed your advice and soldered a 100uF cap over. Perfect!
I uploaded on the first try…
Thanx again
You are THE MAN!!!
Google comes up with hundreds of hits on this problem but this is the only solution that fixes it!
If you are ever in East Sussex I’ll buy you a pint!
Happy it worked for you guys :)