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doc: add dev module and boards by Espressif

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Pin List and Functions (PDF) <http://espressif.com/sites/default/files/documentation/esp32_chip_pin_list_en.pdf>
Chip Pinout (PDF) <http://espressif.com/sites/default/files/documentation/esp32_pinout_v1_0.pdf>
Silicon Errata (PDF) <http://espressif.com/sites/default/files/documentation/eco_and_workarounds_for_bugs_in_esp32_en.pdf>
Modules and Boards <modules-and-boards>
.. toctree::
:caption: Contribute

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ESP32 Modules and Boards
========================
Espressif designed and manufactured several development modules and boards to help users evaluate functionality of ESP32 chip. Development boards, depending on intended functionality, have exposed GPIO pins headers, provide USB programming interface, JTAG interface as well as peripherals like touch pads, LCD screen, SD card slot, camera module header, etc.
For details please refer to documentation below, provided together with description of particular boards.
ESP-WROOM-32
------------
The smallest module intended for installation in final products. Can be also used for evaluation after adding extra components like programming interface, boot strapping resistors and break out headers.
.. image:: http://dl.espressif.com/dl/schematics/pictures/esp-wroom-32.jpg
:align: center
:width: 40%
:alt: ESP-WROOM-32 module (front and back)
* `Schematic <http://dl.espressif.com/dl/schematics/ESP-WROOM-32-v3.2_sch.pdf>`__ (PDF)
* `ESP32 Module Reference Design <https://espressif.com/sites/default/files/documentation/esp32_module_reference_design.zip>`_ (ZIP) containing: OrCAD schematic, PCB layout, gerbers and BOM
ESP32 Core Board V2 / ESP32 DevKitC
-----------------------------------
Small and convenient development module with break out pin headers and minimum additional components. Includes USB to serial programming interface that also provides power supply for the module. Has press buttons to reset the module and put it in upload mode.
.. image:: http://dl.espressif.com/dl/schematics/pictures/esp32-core-board-v2.jpg
:align: center
:width: 50%
:alt: ESP32 Core Board V2 / ESP32 DevKitC board
* `Schematic <http://dl.espressif.com/dl/schematics/ESP32-Core-Board-V2_sch.pdf>`__ (PDF)
* `ESP32 Development Board Reference Design <https://espressif.com/sites/default/files/documentation/esp32_development_board_reference_design.zip>`_ (ZIP) containing: OrCAD schematic, PCB layout, gerbers and BOM
* `ESP32-DevKitC Getting Started Guide <https://espressif.com/sites/default/files/documentation/esp32-devkitc_getting_started_guide_en.pdf>`_ (PDF)
ESP32 Demo Board V2
-------------------
One of first feature rich evaluation boards that contains several pin headers, dip switches, USB to serial programming interface, reset and boot mode press buttons, power switch, 10 touch pads and separate header to connect LCD screen.
.. image:: http://dl.espressif.com/dl/schematics/pictures/esp32-demo-board-v2.jpg
:align: center
:alt: ESP32 Demo Board V2 board
* `Schematic <http://dl.espressif.com/dl/schematics/ESP32-Demo-Board-V2_sch.pdf>`__ (PDF)
ESP32 WROVER KIT V1 / ESP32 DevKitJ V1
--------------------------------------
Development board that has dual port USB to serial converter for programming and JTAG interface for debugging. Power supply is provided by USB interface or from standard 5 mm power supply jack. Power supply selection is done with a jumper and may be put on/off with a separate switch. Has SD card slot, 3.2” SPI LCD screen and dedicated header to connect a camera. Provides RGB diode for diagnostics. Also includes 32.768KHz XTAL for internal RTC to operate it in low power modes.
.. image:: http://dl.espressif.com/dl/schematics/pictures/esp32-devkitj-v1.jpg
:align: center
:width: 90%
:alt: ESP32 WROVER KIT V1 / ESP32 DevKitJ V1 board
* `Schematic <http://dl.espressif.com/dl/schematics/ESP32-DevKitJ-v1_sch.pdf>`__ (PDF)
ESP32 WROVER KIT V2
-------------------
This is an updated version of ESP32 DevKitJ V1 described above with design improvements identified when DevKitJ was in use. Both V1 and V2 versions of this board are ready to accommodate existing ESP-WROOM-32 or the new ESP32-WROVER module.
.. image:: http://dl.espressif.com/dl/schematics/pictures/esp-wrover-kit-v2.jpg
:align: center
:width: 90%
:alt: ESP32 WROVER KIT V2 board
* `Schematic <http://dl.espressif.com/dl/schematics/ESP-WROVER-KIT_SCH-2.pdf>`__ (PDF)
* `ESP-WROVER-KIT Getting Started Guide <https://espressif.com/sites/default/files/documentation/esp-wrover-kit_getting_started_guide_en.pdf>`_ (PDF)