I am new to Arduino so I purchased the Arduino Uno 1.8.0. I am using Mac OSX 10.7.5. On circuit #1 I get an "error 1" (I also tried circuit #2 and #3) "Error compiling for board Arduino/Genuino Uno", "collectZ: error: ld returned1 error status", "exit status 1", "error compiling for board Arduino/Genuino Uno"
Only Bluetooth ports were shown in the "tools" so I downloaded a driver for serial port- "/dev/cu.Usbmodem431" This did not solve my problem.
I changed the USB cords with no results.
I have Googled the problem and found no solutions.
Does anyone have any suggestions?