The Arduino ESP32 version 2.0.1, based on the master ESP-IDF development branch, is out. This new version adds new functionalities, improvements, and bug fixes.

Here is a summary of the major changes and new features added.

On peripherals:

• Serial now uses ESP-IDF API
• Wire now uses ESP-IDF API and works on all supported chips
• Wire-Slave is now implemented

Improvements:

• Smaller memory footprint (smaller than even v1.0.6)
• Improved USB-CDC support for both ESP32-S2 and ESP32-C3
• Added more information on the docs, including the blink tutorial
• Minor improvements on SPI, SD/MMC, SSL, etc
• Added ALPN support

Bug fixes:

• Several boards definitions are fixed (boards.txt).
• Fix on build error with verbose log

What's Changed

See the complete change log down below:

• Supported devices table updated due the 2.0.0 release by @pedrominatel in https://github.com/espressif/arduino-esp32/pull/5616
• Add dummy test for self hosted GitHub runners by @tomassebestik in https://github.com/espressif/arduino-esp32/pull/5521
• [USB CDC] Fix data might not be transmitted until more is written by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5652
• [HWCDC] Improve HW CDC Implementation by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5643
• Update README.MD - "Type: For reference" labels link by @VojtechBartoska in https://github.com/espressif/arduino-esp32/pull/5619
• Docs integration with Wokwi - Blink Tutorial by @pedrominatel in https://github.com/espressif/arduino-esp32/pull/5685
• TTGO T-OI PLUS RISC-V ESP32-C3 Development Board Added by @thambirm in https://github.com/espressif/arduino-esp32/pull/5576
• Update ESP.getChipModel() to support ESP32-S2 by @kintel in https://github.com/espressif/arduino-esp32/pull/5598
• only use ksz8081 for idf versions later than 4.3 (this fixes compile as component for idf 4.3) by @liebman in https://github.com/espressif/arduino-esp32/pull/5599
• Fixes boards.txt entries for the atmegazero_esp32s2, and also the pla… by @eddieespinal in https://github.com/espressif/arduino-esp32/pull/5673
• SD_MMC max_freq_khz is set to HIGHSPEED by default by @dizcza in https://github.com/espressif/arduino-esp32/pull/5631
• Append '/' to an URL with empty path in HTTPClient::begin by @long-long-float in https://github.com/espressif/arduino-esp32/pull/5634
• Fix compilation of HardwareSerial.cpp by @everslick in https://github.com/espressif/arduino-esp32/pull/5677
• Enable progress bar on ArduinoOTA upload (platform.txt) by @tbertels in https://github.com/espressif/arduino-esp32/pull/5657
• Return size_t instead of uint8_t from BLECharacteristic::getLength().… by @felixcollins in https://github.com/espressif/arduino-esp32/pull/5687
• SDMMC frequency selection based on board type by @dukess in https://github.com/espressif/arduino-esp32/pull/5688
• fix off-by-one error in cores/esp32/libb64/cdecode.c by @kokke in https://github.com/espressif/arduino-esp32/pull/5648
• Fix analogWidth for ESP32S2 in esp32-hal-adc.c by @caternuson in https://github.com/espressif/arduino-esp32/pull/5711
• update Adafruit ESP32-S2 boards variants (feather, funhouse, magtag, metro) by @hathach in https://github.com/espressif/arduino-esp32/pull/5718
• include pin_arduino.h for variant USB defines by @hathach in https://github.com/espressif/arduino-esp32/pull/5719
• SD.open() new feature for creating all folders in path by @P-R-O-C-H-Y in https://github.com/espressif/arduino-esp32/pull/5721
• Added comment for user clarity in SDWebserver example by @akym in https://github.com/espressif/arduino-esp32/pull/5724
• Implement Thread-Safe I2C based on ESP-IDF API by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5683
• IDF master by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5479
• Remove git submodule update by @Michal-Szczepaniak in https://github.com/espressif/arduino-esp32/pull/5696
• Fix: SD_MMC deinit by @P-R-O-C-H-Y in https://github.com/espressif/arduino-esp32/pull/5732
• Fix build error when compiling with verbose logging by @urish in https://github.com/espressif/arduino-esp32/pull/5747
• Add support M5Stack Unit CAM by @otakuto in https://github.com/espressif/arduino-esp32/pull/5748
• feat: Add the ability to get the peer certificate of an SSL connection by @dirkx in https://github.com/espressif/arduino-esp32/pull/5744
• [Docs] Added Python is missing on the troubleshooting section by @pedrominatel in https://github.com/espressif/arduino-esp32/pull/5753
• IDF master by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5761
• I2C Slave Implementation by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5746
• IDF master by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5792
• libraries/SPI/src/SPI.h: SPIClass: add method to get SS pin number by @michlv in https://github.com/espressif/arduino-esp32/pull/5788
• Allows spiram malloc with wifi dynamic buffers - better free heap by @SuGlider in https://github.com/espressif/arduino-esp32/pull/5791
• removes deprecated esp_eth_set_default_handlers() by @SuGlider in https://github.com/espressif/arduino-esp32/pull/5795
• log statement missing parameter #5778 by @SuGlider in https://github.com/espressif/arduino-esp32/pull/5796
• analogRead() return value according to value set in analogReadResolution() by @P-R-O-C-H-Y in https://github.com/espressif/arduino-esp32/pull/5776
• IDF release/v4.4 by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5801
• Correct CDC on boot custom menu for Deneyap Mini by @stonehippo in https://github.com/espressif/arduino-esp32/pull/5767
• Remove _user_defined_size from EEPROMClass and EEPROM::length() just returns _size by @hideakitai in https://github.com/espressif/arduino-esp32/pull/5775
• Add ALPN support to WiFiClientSecure by @torntrousers in https://github.com/espressif/arduino-esp32/pull/5633

New Contributors

A special thank you to all new contributors!

• @tomassebestik made their first contribution in https://github.com/espressif/arduino-esp32/pull/5521
• @thambirm made their first contribution in https://github.com/espressif/arduino-esp32/pull/5576
• @kintel made their first contribution in https://github.com/espressif/arduino-esp32/pull/5598
• @liebman made their first contribution in https://github.com/espressif/arduino-esp32/pull/5599
• @dizcza made their first contribution in https://github.com/espressif/arduino-esp32/pull/5631
• @long-long-float made their first contribution in https://github.com/espressif/arduino-esp32/pull/5634
• @tbertels made their first contribution in https://github.com/espressif/arduino-esp32/pull/5657
• @felixcollins made their first contribution in https://github.com/espressif/arduino-esp32/pull/5687
• @dukess made their first contribution in https://github.com/espressif/arduino-esp32/pull/5688
• @kokke made their first contribution in https://github.com/espressif/arduino-esp32/pull/5648
• @caternuson made their first contribution in https://github.com/espressif/arduino-esp32/pull/5711
• @P-R-O-C-H-Y made their first contribution in https://github.com/espressif/arduino-esp32/pull/5721
• @akym made their first contribution in https://github.com/espressif/arduino-esp32/pull/5724
• @Michal-Szczepaniak made their first contribution in https://github.com/espressif/arduino-esp32/pull/5696
• @urish made their first contribution in https://github.com/espressif/arduino-esp32/pull/5747
• @otakuto made their first contribution in https://github.com/espressif/arduino-esp32/pull/5748
• @michlv made their first contribution in https://github.com/espressif/arduino-esp32/pull/5788
• @stonehippo made their first contribution in https://github.com/espressif/arduino-esp32/pull/5767
• @hideakitai made their first contribution in https://github.com/espressif/arduino-esp32/pull/5775
• @torntrousers made their first contribution in https://github.com/espressif/arduino-esp32/pull/5633

Full Changelog: https://github.com/espressif/arduino-esp32/compare/2.0.0...2.0.1-RC1

To see how to contribute to the Arduino ESP32 project, see this reference: Contributing.