IO socket
(1)
1
l
GND
2
5v
3
SCL
4
SDA
5
RXD (R3)
6
TXD (T3)
7
RXD (R4)
8
TXD (T4)
IO socket for I2C/UART3/UART4
Use this socket to connect a GPS receiver with I2C MAG sensors to use Cleanflight GPS features.
IMPORTANT: The
SCL
and
SDA
are
3.3v
signals
5.0v
is also supplied when powering via USB.
IMPORTANT:
5.0v
to
3.3v
logic level converters are
REQUIRED
for
SCL
/
SDA
if your sensors use
5.0v
signals.
IMPORTANT:
3.3v
ONLY signals
for UART3 R3/T3, UART4 can use
5.0v
signals (T4/R4).
RECEIVER
(5)
1
l
RXD (R2 / PPM)
2
TXD (T2 / FrSky TLM)
3
TXD (T5 / SmartPort/Hott TLM)
4
5v
5
GND
RECEIVER port - Molex Picoblade connector
Connect to a receiver using either of the two supplied cables.
FrSky XSR - Use Straight though cable. UART2 for Serial RX, UART5 for SmartPort.
Other Serial RX - Use dupont cable. UART2 for Serial RX, T5/UART5 for Telemetry (Hott/Smartport/etc).
PPM RX - Use dupont cable. RXD/R2/PPM for PPM, TXD/T2/UART2 for Telemetry.
NOTE: There are also header pins and holes for other receivers.
5.0v
is also supplied when powering via USB.
4in1 ESC pads
(3)
1 +
B
2 -
Battery -
4in1 ESC pads -
IMPORTANT:
DOUBLE CHECK
and
TRIPLE CHECK
POLARITY!
For connecting to a 4in1 ESC. See Connections section below.
Receiver Connections
The F7DUAL has many methods to allow receiver connections, the main ones are as follows (listed in order of
popularity):
1) Serial RX on UART2 + Telemetry on UART5 via Picoblade connector (e.g. FrSky XSR).
2) Serial RX on UART2 via Headers Pins + 3v3 PAD (Spektram Satellelite)
3) Serial RX on UART1 via Stacking Header Pins when stacking with VTX board (e.g. FrSky XM+).
4) PPM + Telemetry via UART2 on Header Pins (e.g. FrSky D4R-II)
When using the FrSky XM+ on the Stacking VTX board use the group of 4 header pins marked “T1/R1/5v/-” and
solder the very-low-profile stacking sockets to the 5v/G and R1/T1 either side of the MicroSD card socket. Solder
the very-low-profile stacking pins to the bottom of the Stacking VTX board.
Camera/VTX/LED-Strip BEC Connections.
The F7DUAL supports
5V
or
BATTERY
voltage Cameras and VTXs, however the on-board
5V
regulator is rated for
1.5Amps by it’s manufacturer but other devices, such as the FC itself and any receivers or LED strip connected to
it will use the regulator. To be on the safe side do not use more than 1A at
5V
. Suggest measuring the current
usage of each connected device, one at a time prior to using them all at the same time. If you run more than a
few LED-STRIP LEDs it is better to have a seperate BEC for the LEDs to ensure that LED operation doesn’t interfere
with flight behavior. When checking current draw of LEDs set them to WHITE as this will use the most current.
Cameras and VTXs that support LiPo battery voltages are more flexible and can be connected to either
5V
or
BATTERY
and thus allow you to spread the load.
Camera Connection.
Set the CAM voltage bridge to either
5V
or
BATTERY
voltages, refer to your Camera manual.
