Rather than risk interfering with the native python installation (by inadvertently introducing incompatible packages, etc.) I opted to install Python 3 from I downloaded and ran the macOS 64-bit installer. MacOS comes with Python 2 installed as a “system” utility. After installing this driver for the CH34x the witty’s serial adapter appeared as /dev/tty.wchusbserialfd140Installing Python 3 The driver was installed by following the installation instructions from the GitHub page – including the “force quit” suggestion to avoid having to reboot. That is done in System Preferences->Security & Privacy-> as shown here: The security controls in this macOS haven’t been disabled so installing this package requires manual confirmation of its installation. The latest version (1.5) of this driver is released as a signed package, however the signer of the package is not an “identified developer”. A driver for the CH34x chipset was found on GitHub at After connecting it to the iMac the witty’s (USB) serial port was not found. The witty uses a CH34x USB/serial chipset which macOS High Sierra (10.13) and earlier doesn’t have a native driver for. As the version of macOS used does not include a driver for the “Witty” module’s interface adapter a third-party driver was installed.Device driver for the witty’s interface Python 3 was installed and a Python “venv” virtual environment was created to contain the python libraries used by esptool. This is a walkthrough of how I installed the Python-based esp8266/esp32 serial bootloader utility esptool on my Apple iMac – a 27-inch, Mid 2011 running macOS High Sierra – and used it to program an ESP8266 “Witty” module with esp8266/Basic. You can visit my blog for the complete Windows, Mac OS X and Linux instructions Previous AT versions were based on the ESP8266 NONOS SDK, to which no new features will be added in the future. When developing new products with ESP8266, it is recommended that you use ESP8266 AT Bin V2.0.0.0 and/or later versions. Apples driver and oem drivers conflicting. Catalina has ch340 drivers already and I setup oem driver from GitHub. Are there any solution about this problem? EDIT: I fixed issue last night. I tried some serial monitors, Arduino IDE and platform io ide but still same. *I can see hello world on serial monitor. Double click on Silicon Labs VCP Driver Install Disk.pkg. These are a driver that can communicate to that little square chip (CP210x USB to UART Bridge VCP) we mentioned before: Download it to your Downloads folder. The first step on the mac is to install drivers.

Cyberduck mac os 10.8.5