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Topic: How long does a sketch last? (Read 8 times) previous topic - next topic


Erm I'm not sure opto-isolators are what you need for your purposes.......
If your system involves lethal voltages/life critical/flamable elements - you probably shouldn't need to ask.
The Arduino != PC.


Not to mention we're changing media types every 5-6 years, our ancestors are going to need 50 different media players to figure our shit out


I have a quick question sorta related to the original.  

I recently received my 1st Arduino Uno, smd edition.

When I upload a sketch like Blink, run it, unplug my Usb cord, and plug it back in, it doesn't start the blink sketch over again.

At this point I need to reload the sketch over Usb.

Is this normal?


Is this normal?

No, that is not proper behaviour. Once the board is powered up by either usb power or external power it should start running once the bootloader times out and jumps to the preloaded sketch.

Not sure what would cause your symptom.



From what I read on the Sparkfun forum, other people are having the same problem with the SMD edition.

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