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My program works on arduino MEGA well, but doesn't work on arduino UNO .. why?

The program to write digital output via boolean control, this program works on Arduino MEGA well, but on UNO, there is no output on pin 8 .. why?

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Hi,

 

Looking at the picture I cannot see anything wrong. Did you select the correct COM port ?

What error message do you get ?

 

Kees

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