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+# Board -  Airbot F4 / Flip32 F4 / Generic F4 Flight Controller from Banggood and Aliexpress
+
+![Airbot F4](https://quadmeup.com/wp-content/uploads/2016/10/Flip32-F4-Flight-Controller-pinout.jpg)
+
+> This target supports both MPU6000 and MPU6500 versions of this board
+
+## Features
+
+* STM32F405 CPU
+* Integrated Accelerometer/Gyro MPU6000 or MPU6500 via SPI bus
+* 6 motor outputs
+* 4 UART ports (UART1, UART3, UART6, Softserial1)
+* External I2C bus, pins shared with UART3, can not be used simultaneously
+* Only UART1 is equipped with inverter
+* Onboard 128Mbit (16MB) flash
+* BLHeli Passthrough
+* Integrated voltage stabilizer
+* Buzzer connector
+
+## **NOT** supported
+
+* HC-SR04 Rangefinder
+* ServoTilt
+
+## Radio Receivers
+
+SerialRX, PPM and MSP receivers are supported.
+
+SerialRX and PPM receivers should be connected to dedicated _PPM SBUS_ connector above _Motor 1_. MSP receivers should be connected to one of UARTs configured as MSP.
+
+## Motors
+
+| Motor     | pin   |   Shared with |
+| ----      | ----  |   ----        |
+| 1         | PB0   |               |
+| 2         | PB1   |               |
+| 3         | PA3   |               |
+| 4         | PA2   |               |
+| 5         | PA1   | LED Strip     |
+| 6         | PA8   |               |
+
+## USB
+
+This board uses STM32 VCP and _not_ utilizes UART when USB is connected. STM32 VCP drivers might be required!
+
+Flashing requires DFU mode and STM32 DFU drivers. Use [Zadig](http://zadig.akeo.ie) tool to install WinUSB driver on Windows.
+
+## Buzzer / Beeper
+
+5V piezo buzzer should be connected directly to dedicated pins _BUZ +_ and _BUZ -_. No additional hardware is required.
+
+## RSSI ADC
+
+* Connected to pin PA0
+* 3.3V tolerant, do not supply 5V
+
+## Current Meter ADC
+
+* Connected to pin PC1
+* 3.3V tolerant, do not supply 5V
+
+## Voltage monitoring
+
+* Connected to pin PC2
+* Connected to VBAT pins (both are the same) and integrated Voltage Stabilizer (LM7805M)
+
+## Integrated voltage stabilizer
+
+It is integrated with voltage monitoring and always powered when VBAT is connected to battery.
+Because this is **Linear Stabilizer**, it has a tendency to overheat, especially on 4S. Because of that,
+avoid powering too many devices directly to 5V pins on the board. RX receiver is (and board itself) is rather all
+it can do without overeating (150mA on 4S gives 1.5W of waste heat!). OSD, LED Strip and other devices should powered from separate BEC if voltage monitoring is to be enabled.
+
+## LED Strip
+
+LED strip is enabled on Motor 5 pin (PA1)
+
+## SoftwareSerial
+
+This board allows for single **SoftwareSerial** port on small soldering pads located next to UART3 pins.
+
+| Pad   | SoftwareSerial Role   |
+| ----  | ----                  |
+| CH5   | RX                    |
+| CH6   | TX                    |