Last Night im Working With Rellay With Led Light Than After Some Uploding Programm… Led Pin 13 Always On i Cant Uplode Code…I Also Try To Change Port satting …Plz Help…
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xc9
Why Start EVERY Word With A Cap???
But led 13 on will also happen when the pin is an input or the Uno is in reset.
As far as the programming, have you tried disconnecting everything?
Disconnect the board from everything (except the PC,obviously.) and try to upload the code. If it doesn't work ,try to set the programmer to AVRISPmkII and burn the bootloader. After burning the bootloader, press the reset button, the LED on pin 13 should flash 3 times indicating that the bootloader is working. So, you can try uploading the code again. Let us know what happens.