In Arduino IDE: Press Shift while starting the upload in order to get more information about the problem. Check that the standalone microcontroller is powered."avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x3f " while uploading a sketch."avrdude: Yikes! Invalid device signature." To clarify, there is no external power supply, just the 5V coming out of my laptop into the USB port on the Arduino UNO.
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