Hi, using digitalWrite(13, HIGH); from a sample code LED blink on board does not have effect in my code ; i.e. LED still be off.
My code comes from SD datalogging sample and works perfectly.
In the setup() function a pinMode(13; OUTPUT); directive was entered and after
digitalWrite(13, HIGH); was entered too.
No compiling error was found and code gone to my ARDUINO UNO perfectly with SD gestures without errors but LED on board still not have effect.
Using a separate code from IDE samples i.e. led blink, shows that there are not hardware problem thus LED behaviour is lighting and off alternating.
Any suggest will be appreciated thanks.