m using Arduino_18, just now i tried to use Watchdog timer_30MS and guess what, it makes 13 blinking all the time.
Now, i cant upload anything to my arduino mega.
Some one, plz save me.... :'(
Yes this is because the watchdog kicks in before there has been time to recognise the download.
The only way back is to re burn your bootloader (and fuses) with a programmer.
What and how programmer should i do?
Sounds like my issue here... http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1258251558/6#6
There may be an alternate to reburning bootloader.