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+
+######  ESP32 support in der IDE:
+Lib for Arduino IDE ... paste into BoarManager URLs (Datei->Voreinstellungen)
+https://dl.espressif.com/dl/package_esp32_index.json
+
+Dann Werkzeuge->Board:..->Boardverwalter .
+ESP32 lib suchen und installieren.
+
+Der "alte" Installationsweg war anders - falls im Library Pfad noch vorhanden:  /Arduino/hardware/ESP32 löschen.