User Manual

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1. SWD Debugging

connector

2. UART2 connector

3. Micro USB socket

4. UART3 headers

5. UART1 headers

6. IO_1 connector

7. IO_2 connector

8. Battery voltage

monitoring headers

9. Buzzer headers

10. ESC / Servo output

headers

11. Boot headers

8 9

BOOT (11)

1 l 3.3v

2 l BOOT

Boot Headers - Used for recovering firmware

No connection = Boot Normally

Bridged = STM32 Bootloader

BUZZER (9)

1 n BUZZER -

2 l VCC / BUZZER +

Buzzer headers - Connect to a buzzer for warnings and notifications

Use a low-power ~50mA 5.0v buzzer that only requires power to produce sound, e.g. Sonicrest HCM1205X.

See Cleanflight manual for links. Can also be used to find your aircraft after a crash.

IO_1 (6)

GND

2 VCC

3 CH1 / PPM

4 CH2 / GPIO

5 CH5 / GPIO

6 CH6 / GPIO

7 LED_STRIP

3.3v

IO_1 connector - PWM RX / PPM RX / GPIO / LED Strip

When using a PWM receiver connect CH1/2/5/6 to PWM RX.

LED Strip data signal can be used to change individual colors of each LEDs on a strip of WS2812 RGB leds -

Perfect for battery warning lights, orientation lights, indicators, failsafe, display flight modes, etc.

CH1/2/5/6 can be used as a general purpose IOs when not used for PPM/PWM RX.

A 3.3v output is also available.

IO_2 (7)

GND

2 VCC

3 CH3 / RXD

4 CH4 / TXD

5 CH7 / SONAR TRIGGER

6 CH8 / SONAR ECHO

7 ADC_1 / CURRENT METER

ADC_2 / RSSI

IO_2 connector - Serial RX / PWM RX / GPIO / UART3

When using a PWM receiver connect CH3/4/7/8 to PWM RX.

When using a 3.3v Serial RX receiver (S.Bus, SUMD/H, etc.) use GND/VCC/CH3 (UART3 RX).

CH3/4/7/8 can be used as general purpose IO when not used for Serial/PWM RX.

CH7/8 can be used for a 3.3v Sonar sensor when not used for PWM RX.

ADC_1/2 can be used to connect Battery Current Monitoring and RSSI signals. (3.3v MAX).

UART3 (4)

1 n GND

2 l VCC

3 l TXD

4 l RXD

UART1 (5)

1 n GND

2 l VCC

3 l TXD

4 l RXD

UART3 headers - Used for 3.3v Serial IO. (Serial RX, etc.)

MUST NOT be used when PWM RX is in use. MUST NOT be used at the same time as IO_2 CH3/4.

UART1 headers - Used for 5.0v Serial IO. (OSD, etc.)

MUST NOT be used when a cable is connected to the USB port.

OUTPUTS 1 - 8 (10)

1 -

2 + VCC

3 S SIGNAL

OUTPUT headers - Connect up to 8 motors and/or servos

Currently supports PWM ESCs (400hz default), Oneshot 125 ESCs and PWM servos (50hz default).

WARNING: Configure outputs before connecting power to servos and ESCs.

VBAT (8)

1 n GND / BATTERY NEGATIVE -

2 l BATTERY POSITIVE +

VBAT headers - Connect flight battery for voltage monitoring, logging and warnings

WARNING: DOUBLE CHECK POLARITY!

SWD/DEBUG (1)

1 l GND

2 NRST

3 SWDIO

4 SWDCLK

UART2 (2)

1 l GND

2 VCC

3 TXD/SWDCLK

4 RXD

UART2 connector - Used for 5.0v Serial IO. (GPS, etc.)

MUST NOT be used when SWD port is in use.

SWD/DEBUG connector - Used for software development or flashing via SWD

Cannot be used when UART2 is enabled. Use an ST-Link debugger with OpenOCD or a J-Link debugger.

SPRacingF3 http://seriouslypro.com - http://cleanflight.com Page 4

Table Legend

1. Port name

2. Port number

3. PCB marker / Pad

shape

4. Pin number

5. Cable color

6. Signal Name

7. Signal Color

UART2 (2)

1 l GND

2 VCC

3 TXD/SWDCLK

4 RXD

A. Power LED

B. Status LED

C. Orientation indicator

D. Accelerometer & Gyro

sensor

E. Magnetometer (Compass

sensor, Deluxe Only)

F. 8Mb Flash Storage

G. STM32F303 processor

with FPU

H. M3 mounting hole