Yet another MacOS Arduino Serial Port solution...

Yet another MacOS Arduino Serial Port solution

Every year and every new MacOS version the same: 
masses of people posting about problems with the serial connection discussing solution that do not work in general.

This is my way with MacOS El Captain (10.11.6) and Arduino 1.8.2 ;-)

(yes, versions are important, because the solution may not work with any other)
(no, Do NOT try the "FTDI" solution, it does not work anymore in this case)


Problem:
- Install and Open Arduino IDE 
- Select Tools -> Port and see no serial port but the tty.- or cu.Bluetooth-Incoming-Port


Solution:
Step 1 Reboot and press (and hold) CMD+R immediately after the chime to enter Recovery Mode
Step 2: Open Terminal from Recovery mode
Step 3: run the command csrutil enable --without kext
Step 4: reboot


=> After that you see in Tools -> Port the new entry for the UNO: /dev/cu.wchusbserialfd120
=> Use this for your work with Arduino.



More about tty and cu:
- https://lists.apple.com/archives/usb/2009/Nov/msg00039.html

More stuff about the serial ports:
- https://learn.sparkfun.com/tutorials/terminal-basics/tips-and-tricks
- http://arduino.stackexchange.com/questions/30005/arduino-port-not-showing-serial-usb-mac-os-el-capitan
- https://tzapu.com/making-ch340-ch341-serial-adapters-work-under-el-capitan-os-x/
- http://stackoverflow.com/questions/19621554/dev-tty-serial-missing-in-macos-10-9-mavericks

- https://tzapu.com/making-ch340-ch341-serial-adapters-work-under-el-capitan-os-x/