![]() 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. 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.
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