Install arduino-esp32 2.0.0-alpha1 on Arduino IDE, Alpha preview with support for ESP32-S2 and ESP32-C3.

Currently (as on 2021-04-28), arduino-esp32 support ESP32-S2 and ESP32-C3 in development release 2.0.0-alpha1.

To install development release to Arduino IDE board manager:

Click in Arduino IDE Menu > File > Preferences

Enter development release link () in Additional Boards Manager URLs:
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json

Open board manager:

Tools > Board > Boards Manager
Search and select esp32 by Esoressif systems, install the latest version, currentlt 2.0.0-alpha1.

After then, ESP32C3/ESP32S2 Dev Modules are available in board list.

~ release note of 2.0.0-alpha1

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Exercise:

ESP32-S2:

~ web server control onboard RGB LED (NeoPixel)

ESP32-C3:

~ read Network Time from pool.ntp.org