My arduino uno r3 doesnt upload the sketch or erasing the old one it is just blinking the LED , i pressed the reset button and just restarted the sketch , i want to erase the old sketch and upload a new one
What error do you get when you attempt to upload a sketch?
no error shows but only still blinking the led ,rather than excuting my code which includes pir sensor and led , the LED only blinking
Please show your code and describe exactly how you do the upload. I can't think of any reason why you would not get an error on the upload and still not get your sketch to run.