The Arduino ESP32 version 2.0.2 based on the ESP-IDF v4.4-beta1 includes mainly peripheral APIs refactoring, improvements and bug fixes.

Here is a summary of the major changes.

Peripherals refactored to use ESP-IDF APIs:

• Timer
• LedC
• DAC
• RMT
• SigmaDelta

Improvements:

• Boards added and some updated (TTGO-LoRa32, Adafruit boards, DPU ESP32...)
• Added Sonoff DUALR3 support with RainMaker example
• GPIO defines for C3 added
• Github CLI workflow updates
• Added support to change LoopTask Stack size
• New Documentation added (USB, GPIO, Arduino as component)

Bugfixes:

• I2C Clock stretching
• SD card status check
• Baudrate with CPU Freq < 80MHz
• SetCpuFrequencyMhz() changes Serial bauds if frequency<80Mhz
• Lib Builder compiling errors
• WiFiSecureClient memory leaks when SSL/TLS connection fails
• Change default WiFi STA encryption to WIFI_AUTH_WPA2_PSK
• Forces UART Flush() to wait until all bits are sent

See all bug fixes in the complete changelog below.

What's Changed

See the complete changelog down below:

• Fix compiler.libraries.ldflags Option by @tanakamasayuki in https://github.com/espressif/arduino-esp32/pull/5866
• [Docs] Add link to supported soc list on README and ESP32-S3 datasheet by @pedrominatel in https://github.com/espressif/arduino-esp32/pull/5891
• Fix compilation error of Deneyap Mini Board by @zeynepdicle in https://github.com/espressif/arduino-esp32/pull/5903
• cbuf: allow inheritance by @FrankBoesing in https://github.com/espressif/arduino-esp32/pull/5883
• Fix I2C clock stretching issue with ESP32 by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5910
• IDF release/v4.4 by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5911
• [DOCS] Editing usage of Arduino as a component in ESP-IDF by @P-R-O-C-H-Y in https://github.com/espressif/arduino-esp32/pull/5896
• [Docs] Update on the Windows install procedures by @pedrominatel in https://github.com/espressif/arduino-esp32/pull/6018
• Update boards.txt for Adafruit Feather ESP32-S2 by @hathach in https://github.com/espressif/arduino-esp32/pull/6006
• SD Card status check fix by @P-R-O-C-H-Y in https://github.com/espressif/arduino-esp32/pull/5988
• Delete .travis.yml file. by @Ouss4 in https://github.com/espressif/arduino-esp32/pull/5987
• Correct the execute bit of some files. by @Ouss4 in https://github.com/espressif/arduino-esp32/pull/5986
• .github/workflows: Update checkout and setup-python actions to their V2 version. by @Ouss4 in https://github.com/espressif/arduino-esp32/pull/5985
• Update Boards.txt by @woodif in https://github.com/espressif/arduino-esp32/pull/5984
• Prevent self hosted jobs to run on forks. by @Ouss4 in https://github.com/espressif/arduino-esp32/pull/5983
• [Feature] Added Sonoff DUALR3 support with RainMaker example by @pedrominatel in https://github.com/espressif/arduino-esp32/pull/5980
• Merged all TTGO-LoRa32 Board profiles (see #5933) by @tobozo in https://github.com/espressif/arduino-esp32/pull/5961
• Use WIFI_FAST_SCAN if a specific channel was used by @obaterspok in https://github.com/espressif/arduino-esp32/pull/5975
• Don't clear custom HTTP headers on redirect in HTTPClient by @wojtekka in https://github.com/espressif/arduino-esp32/pull/5973
• add board variant for WT32-ETH01 (wt32-eth01) from Wireless-Tag by @mondbaron in https://github.com/espressif/arduino-esp32/pull/5946
• [DOCS] Writing a new Arduino documentation about GPIO by @halyssonJr in https://github.com/espressif/arduino-esp32/pull/5894
• Implement Timer based on ESP-IDF API by @P-R-O-C-H-Y in https://github.com/espressif/arduino-esp32/pull/5931
• MD5Builder update for esp_rom API usage by @atanisoft in https://github.com/espressif/arduino-esp32/pull/5941
• Add DPU ESP32 variant by @TAMCTec in https://github.com/espressif/arduino-esp32/pull/5884
• Fix for BluetoothSerial build when using nimBLE instead of Bluedroid by @JakubRybakowski in https://github.com/espressif/arduino-esp32/pull/5920
• Fix WiFiSecureClient memory leaks when SSL/TLS connection fails by @ppescher in https://github.com/espressif/arduino-esp32/pull/5945
• Adding Issue and Feature template by @VojtechBartoska in https://github.com/espressif/arduino-esp32/pull/5999
• using ksz8081 only from ESP-IDF 4.4 onwards by @vitorrussi in https://github.com/espressif/arduino-esp32/pull/5918
• Refactoring TwoWire::requestFrom() headers in Wire.cpp by @Maelstrom96 in https://github.com/espressif/arduino-esp32/pull/5935
• IDF release/v4.4 by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/5996
• Add some more adafruit boards and fix some board typos by @ladyada in https://github.com/espressif/arduino-esp32/pull/6014
• Change default WiFi STA encryption to WIFI_AUTH_WPA2_PSK by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/6022
• Implement DAC based on ESP-IDF API by @P-R-O-C-H-Y in https://github.com/espressif/arduino-esp32/pull/5959
• Forces UART Flush() to wait until all bits are sent by @SuGlider in https://github.com/espressif/arduino-esp32/pull/6026
• Adds support to change LoopTask Stack size by @SuGlider in https://github.com/espressif/arduino-esp32/pull/6025
• [Fix] Added the Win32 not supported notice/warning by @pedrominatel in https://github.com/espressif/arduino-esp32/pull/6031
• fix variant wt32-eth01 (initializer not constant) by @mondbaron in https://github.com/espressif/arduino-esp32/pull/6040
• HID_BRAILLE_DISPLAY by @discapacidad5 in https://github.com/espressif/arduino-esp32/pull/6043
• Implement LEDC based on ESP-IDF API by @P-R-O-C-H-Y in https://github.com/espressif/arduino-esp32/pull/6045
• Fixes baudrate with CPU Freq < 80MHz by @SuGlider in https://github.com/espressif/arduino-esp32/pull/6037
• [Docs] Added USB documentation by @pedrominatel in https://github.com/espressif/arduino-esp32/pull/6036
• [Examples] README revision to include missing and remove old entries by @pedrominatel in https://github.com/espressif/arduino-esp32/pull/6049
• RMT refactoring based on IDF by @SuGlider in https://github.com/espressif/arduino-esp32/pull/6024
• IDF release/v4.4 by @me-no-dev in https://github.com/espressif/arduino-esp32/pull/6048
• Update pinout for two adafruit boards by @ladyada in https://github.com/espressif/arduino-esp32/pull/6050
• add GPIO defines for C3 by @NiklasVoigt in https://github.com/espressif/arduino-esp32/pull/6005
• Fixes Lib Builder compiling errors by @SuGlider in https://github.com/espressif/arduino-esp32/pull/6052
• Implement SigmaDelta based on ESP-IDF API by @P-R-O-C-H-Y in https://github.com/espressif/arduino-esp32/pull/6053

New Contributors

A special thank you to all new contributors!

• @Ouss4 made their first contribution in https://github.com/espressif/arduino-esp32/pull/5987
• @obaterspok made their first contribution in https://github.com/espressif/arduino-esp32/pull/5975
• @wojtekka made their first contribution in https://github.com/espressif/arduino-esp32/pull/5973
• @mondbaron made their first contribution in https://github.com/espressif/arduino-esp32/pull/5946
• @halyssonJr made their first contribution in https://github.com/espressif/arduino-esp32/pull/5894
• @TAMCTec made their first contribution in https://github.com/espressif/arduino-esp32/pull/5884
• @JakubRybakowski made their first contribution in https://github.com/espressif/arduino-esp32/pull/5920
• @vitorrussi made their first contribution in https://github.com/espressif/arduino-esp32/pull/5918
• @Maelstrom96 made their first contribution in https://github.com/espressif/arduino-esp32/pull/5935
• @discapacidad5 made their first contribution in https://github.com/espressif/arduino-esp32/pull/6043
• @NiklasVoigt made their first contribution in https://github.com/espressif/arduino-esp32/pull/6005

Full Changelog: https://github.com/espressif/arduino-esp32/compare/2.0.1...2.0.2

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