R/C Installation Guide

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! Important - Please disconnect the propellers and Sky battery before performing the steps below

Not only a cloud connected drone, the Sky also offers users backward compatibility with PPM-Sum and S-BUS enabled R/C receivers through its Pixhawk autopilot.

Compatible Remotes Any receiver that has a PPM or S-BUS output can be used together with the Sky. Please see a complete list here, for additional information.

Hardware Connection In this example, we will be using the FrSky D4R-II Receiver. The R/C receiver connects to the Pixhawk via a 3 pin connection. Please adhere to the following steps in order to make the appropriate hardware connections.

1. Install a jumper on pins 3 and 4 of the D4R-II Receiver in order to enable- this enables the PPM output on port 1 of the D4R-II

2. Connect a 3-wire “Servo cable” between the Sky’s Pixhawk “RC” pins and D4R-II’s “Port 1”. Please see below for cable pin outs.


A general rule of thumb: Please make sure that the “signal” pin on the Pixhawk (lower pin in the scheme below), connects to the “PPM Signal” pin on the D4R-II. This will ensure the cable is not reverse connected.

3. Secure the D4R-II and its antennas to the Flytrex Sky. Please see in the photo below for a recommended location.


Software Configuration The Sky uses the Pixhawk and thus uses its configuration software.

1. If you haven’t done so yet, please download and install Mission Planner. When prompted to install drivers, please do so. More information on installation is available here.

2. When connecting the Sky to the PC via USB, please use a USB to Micro USB cable to connect the Sky to the PC. The Micro USB header is located on the side of the autopilot, and is accessible through the Sky front-right leg, please see illustration below. First connect the cable to the Sky, and only then proceed to connect the other side to the PC. Inserting the USB header might be tricky, please avoid damaging or stressing the wires that reach out to the ESC and motors.


Important: please avoid damaging or stressing the wires that reach out to the ESC and motors. Care should be taken both when inserting the USD cable and disconnecting it.


3. After connecting the USB cable to the Sky, you can connect the other side to your PC.

4. After connecting the Sky to your PC with the USB cable, please allow a few seconds for the drivers to be installed. The top two blue LEDs on the Sky should turn off after about 10 seconds.

5. Next, click the “Mission Planner” icon

6. In the upper right corner, choose the COM port that corresponds to your Sky. The COM should be marked as “PX4” and select “115200” as the connection speed. Click “CONNECT” and the icon should become green (instead of red.)


7. Open the “INITIAL SETUP”, “Mandatory Hardware”, “Radio Calibration”


8. Click “Calibrate Radio” and follow the program’s instructions. The green bars should move in the same direction as your RC sticks. If they move in the opposite direction, please consult your RC manual to reverse the specific channel.


Note: Pitch channel should in the opposite direction. A low number should equal forward. 9. Recommended: In addition to the 4 mandatory channels (Roll, Pitch, Yaw and Throttle), you can also define a fifth channel dedicated to the Flight Mode - allowing you to switch the autopilot to a “Land Now” or “Return Home” mode by moving a switch on your RC. Please see here for complete instructions.

Please note that the RC and the Sky server override each other: If you select a flight mode in the Sky app, it will override your RC switch location. However, moving the RC switch will override the last flight mode sent from the server.