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+# Board - MATEKSYS F405 family
+
+![Matek F405-AIO](http://www.mateksys.com/wp-content/uploads/2017/06/F405-AIO_2.jpg)
+
+### [Matek F405-CTR](https://inavflight.com/shop/p/MATEKF405CTR)
+### [Matek F405-STD](https://inavflight.com/shop/p/MATEKF405STD)
+### [Matek F405-AIO (end-of-life)](http://www.mateksys.com/?portfolio=f405-aio)
+### [Matek F405-OSD (end-of-life)](http://www.mateksys.com/?portfolio=f405-osd)
+
+## Firmware
+
+Due to differences on the board (I2C - see below), there are two firmware variants:
+
+| Board  | Firmware |
+| ------ | -------- |
+| Matek F405-AIO, STD, CTR | inav_x.y.z_MATEKF405.hex<br/>inav_x.y.z_MATEKF405_SERVOS6.hex |
+| Matek F405-OSD | inav_x.y.z_MATEKF405OSD.hex |
+
+## Hardware features
+
+* MCU: STM32F405RGT6, 168MHz
+* IMU: ICM-20602 (OSD, AIO, STD), MPU6000 (CTR)
+* OSD: BetaFlight OSD w/ AT7456E chip
+* Baro: BMP280 (STD, CTR)
+* Compass: No
+* Blackbox: MicroSD card slot
+* VCP, UART1, UART2, UART3, UART4, UART5
+* Built in inverter for SBUS input (UART2-RX)
+* PPM/UART Shared: UART2-RX
+* Battery Voltage Sensor
+* I2C SDA & SCL: Yes
+* LDO: 3.3V Max. 300mA
+* Current Sensor: Yes (AIO, CTR), otherwise FCHUB-6S option
+* Integrated Power Distribution Board: Yes (AIO, CTR), otherwise FCHUB-6S option
+* Integrated Voltage Regulator: 5V 2A & 9V 2A (AIO), 5V 2A (CTR), otherwise FCHUB-6S option
+* 6 PWM / DSHOT capable outputs
+* WS2812 Led Strip : Yes
+* Beeper: Yes
+* RSSI: Yes
+* Side-press button for BOOT(DFU) mode
+* Anti-vibration Standoffs
+
+### I2C
+
+The F405-AIO, STD, CTR boards expose dedicated I2C pads.
+The F405-OSD does not expose I2C. For INAV there is a software I2C provision using the USART3 pads, as:
+
+* SDA => RX3, SCL => TX3
+* Do not assign any serial function to USART3
+
+### PWM and Servos
+
+Due to the available hardware, please note:
+
+#### Flying Wing
+
+* S1 : ESC
+* S2 : LEFT elevon
+* S3 : RIGHT elevon
+
+#### Tricopter
+
+* S1 : Tail Servo
+* S2 : Motor 1
+* S3 : Motor 2
+* S4 : Motor 3
+
+If you need servo connected to S6 pin while keeping motors on S1..S4 pins (e.g. camera tilt on quadcopter), please flash MATEKF405_SERVOS6 firmware.
+
+I2C requires that the WS2812 led strip is moved to S5, thus WS2812 is not usable on hexcopter and similar.
+
+### Soft Serial
+
+Soft serial is available as an alternative to a hardware UART on RX4/TX4 and TX2. By default this is NOT inverted. In order to use this feature:
+
+* Enable soft serial
+* Do not assign any function to hardware UART4
+* Assign the desired function to the soft-serial ports
+* UART4 TX/RX pads will be used as SoftSerial 1 TX/RX pads
+* UART2 TX pad will be used as SoftSerial 2 TX pad
+
+RX2 and SBUS pads can be used as normal for receiver-only UART. If you need a full duplex UART (IE: TBS Crossfire) and SoftSerial, then use UART 1, 3 or 5 for Full Duplex.
+
+#### Common scenarios for SoftSerial on this boards:
+You need to wire a FrSky receiver (SBUS and SmartPort) to the Flight controller
+* Connect SBUS from Receiver to SBUS pin on the Flight Controller
+* Connect SmartPort from Receiver to TX2 pad on the Flight Controller
+* Enable SoftSerial and set UART2 for Serial RX and SoftSerial 2 for SmartPort Telemetry
+
+You need to wire a SmartAudio or Trump VTX to the Flight controller
+* Connect SmartAudio/Tramp from VTX to the TX4 pad on the Flight Controller
+* Enable SoftSerial and set SoftSerial 1 for SmartAudio or Tramp
+
+### USB
+
+This board uses STM32 VCP and does _not_ use a UART when USB is connected. STM32 VCP drivers might be required on some operating systems.
+
+Flashing requires DFU mode and STM32 DFU drivers. On Linux, the configurator or `dfu-util` work with a `udev` rule.
+
+````
+# DFU (Internal bootloader for STM32 MCUs)
+SUBSYSTEM=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="df11", MODE="0664", GROUP="plugdev"
+ATTRS{idVendor}=="0483", ATTRS{idProduct}=="5740", ENV{ID_MM_DEVICE_IGNORE}="1"
+````
+
+On Windows, it may be necessary to use the [Zadig](http://zadig.akeo.ie) tool to install the WinUSB driver.
+
+## Manufacturer
+
+Matek Systems: http://www.mateksys.com/
+
+## Distributors
+
+* [Matek F405-CTR](https://inavflight.com/shop/p/MATEKF405CTR)
+* [Matek F405-STD](https://inavflight.com/shop/p/MATEKF405STD)
+
+## FAQ & Known Issues
+
+Rcgroups Thread Matek F405: https://www.rcgroups.com/forums/showthread.php?2889298-MATEKSYS-Flight-Controller-F405-OSD-32K-Gyro-5xUARTs-SD-Slot
+
+Rcgroups Thread Matek F405-AIO: https://www.rcgroups.com/forums/showthread.php?2912273-Matek-Flight-Controller-F405-AIO
+
+This board doesn't have hardware inverters for UART pins. This page explains getting SmartPort telemetry working on F4 board:  https://github.com/iNavFlight/inav/blob/master/docs/Telemetry.md