NodeMCU & Wemos D1 mini Arduino IDE setup and missing libraries
On my MacOS Big Sur since the update and I did the following :
Arduino IDE 1.8.13
- Download https://github.com/espressif/esptool/archive/v3.0.zip
- Download https://github.com/pyserial/pyserial/archive/v3.4.zip
- Extract the contents to esptool/ and pyserial/ in the ~/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/tools/ folder (an equivalent must exist on Windows)