微處理器 - Espressif ESP-32S (NodeMCU-32) - Additional Boards Manager URLs

File => Preferences... => Additional Boards Manager URLs

https://dl.espressif.com/dl/package_esp32_index.json
https://arduino.esp8266.com/stable/package_esp8266com_index.json
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json

添加完成後，記得到Tools => Board => Boards Manager...添加如下開發板

esp32 by Espressif Systems
esp8266 by ESP8266 Community
Arduino ESP32 Boards by Arduino

P.S. 如果沒有添加這些板子，則esp_wifi.h、esp_now.h會找不到