Wiring Requirements

The Reflex uses standard JST-GH connectors for most of the interfaces. The required wiring that needs to be organised prior to integrating the Reflex includes:

• Power:
  • 5 V to Reflex power connection through 4 pin Molex nano-fit connector with 0 - 5 V analog voltage and current battery measurement signal.
• ESC:
  • ESCs signal wiring to the Reflex's ESC port through 10 pin JST-GH connector via Fusion ESC signal breakout board.
• Sensors:
  • GNSS rover module to the Reflex's 5 pin JST-GH GNSS port.
  • Magnetometer to the Reflex's 4 pin JST-GH I²C port.
  • Rangefinder to the Reflex's 4 pin JST-GH UART or I²C port.
  • Telemetry to the Reflex's 4 pin JST-GH UART port.
• Remote Control:
  • Radio receiver to the Reflex's 5 pin JST-GH port.

Power

The Reflex requires a 5 V power supply within an operating range of 4.75 V to 5.25 V. The 5 V power can be supplied to the Reflex using the provided USB power cable for ground testing. However, for drone operations, the typical method of supplying power is through a LiPo battery connected to a Power Distribution Board (PDB) on the drone. The PDB distributes power from the battery to the Electronic Speed Controllers (ESC). Some PDBs also provide a 5 V output that can be used to power the Reflex. If the PDB does not have a built-in 5 V output, an additional Battery Eliminator Circuit (BEC) would be required to supply the necessary 5 V power to the Reflex.

Commenly used PDBs are from Mateksys and Holybro.

Some PDBs are known to provide V/I measurement via analog signal. If a PDB does not have this capability, an analog power module such as Holybro PM02 V3 can be used. It should be connected inbetween battery and the PDB.

The 5 V power and analog signals are connected to the Reflex through a Molex Nanofit 4 pin connector as seen in Pinout Reference.

Note: Support for digital voltage and current measurement through I²C will be added via software update in the near future.

ESC

The Reflex supports ESCs that communicate using both (Bidirectional) DShot and PWM protocols, as detailed in ESC Protocol. The ESCs can be connected to the Reflex through the 10-pin JST-GH connector on the IO ports as seen in Pinout Reference. The IO ports support up to 16 ESCs.

The Reflex also ships with break-out boards that can be used to divide the 10-pin connector into the regular 2.54 mm pin headers that generally come with ESCs. This can also be seen in ESCs.

Sensors

The sensors on the drone can be connected to the Reflex using the UART and the I²C ports available on it. The supported sensors which use these I²C or UART communication protocols to interface with the Reflex are listed in Supported Sensors. For the required wiring and communication protocols associated with each of the specific sensors, please refer to Pinout Reference.

Remote Control

The Reflex has a 5 pin JST-GH port dedicated to an RC receiver connection. The wiring it requires can be seen in Pinout Reference based on the protocol used. For the SBUS protocol, the wire needs to be connected to the RXTX1 port of the RC.