BOOT
(12)
1
n
3.3v
2
l
BOOT
Boot Headers - Used for recovering firmware
No connection = Boot Normally
Bridged = STM32 Bootloader
SWD/DEBUG
(1)
1
l
GND
2 R NRST
3 D SWDIO
4 C SWDCLK
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.
If for some reason you cannot flash using USB DFU or UART1 you can reinstall firmware using this port.
BUZZER
(11)
1
n
BUZZER- (B-)
2
l
(B+) / 5v
BUZZER
Use 5V and BUZZER- to connect to an external buzzer.
5.0v
is also supplied when powering via USB.
NOTE:
You can check the transponder LED is working by using a mobile phone camera pointed straight at the LED when the transponder is enabled via the
board and in the software. The LED will pulse an infrared signal which usually shows up purple via a mobile phone camera.
UART2 socket
(1)
1
l
GND
2
5v
3
TXD/SWDCLK
4
RXD
UART2 connector - Used for
5.0v
Serial IO. (GPS, etc.)
TXD
MUST NOT
be used when SWD port is in use.
5.0v
is always supplied via the on-board voltage regulators, even when powering via USB.
I2C1 socket
(2)
1
l
GND
2
5v
3
SCL
4
SDA
I2C1 connector - Used for external sensors and OLED displays.
The
SCL
and
SDA
are
3.3v
signals.
5.0v
is also supplied when powering via USB.
IMPORTANT:
logic level converters are
REQUIRED
if your sensors use
5.0v
signals.
IR/LED STRIP SELECT
(2)
1
t
IR
2
n
OUTPUT
3
u
LED STRIP
IR / LED STRIP Select Pads
Create a solder bridge between
TWO PADS ONLY
to select the function of the OUTPUT pad.
a) bridge
t
and
n
to use the “IR+” pad for TRANSPONDER.
b) bridge
n
and
u
to use the “IR+” pad for LED_STRIP.
SPRacingF3EVO
Page 5
BOTTOM
1. SWD debugging socket.
2. IR / LED select pads.
3. RSSI Analog/PWM select
pads.
A. MicroSD card socket
A
3
1
2
RSSI PWM / ANALOG SELECT
(3)
1
t
PWM RSSI
2
n
INPUT
3
u
ANAGLOG RSSI
RSSI PWM / ANALOG Select Pads
Create a solder bridge between
TWO PADS ONLY
to select the function of the INPUT pad.
a) bridge
t
and
n
to use the “RSSI” pad for PWM RSSI - for
0 - 5v
PWM signals.
b) bridge
n
and
u
to use the “RSSI” pad for ANALOG RSSI - for
0 - 3.3v
Analog Signals.
NOTE:
When bridging select pads with solder, put a small blob of solder on two pads, then bridge them together with a little more solder.
IMPORTANT: DO NOT CONNECT ALL THREE PADS TOGETHER.
