보조 컴퓨터 주변 기기
이 섹션에는 보조 컴퓨터의 주변 장치에 대하여 설명합니다. 여기에는 보조 컴퓨터(PX4에 의해 트리거/액세스될 수 있음)에 장착 가능한 부품과 컴퓨터를 비행 컨트롤러에 연결용 부품들을 설명합니다.
보조 컴퓨터 / 픽스호크 통신
Pixhawk를 사용하는 일반적인 보조 컴퓨터에는 Pixhawk 하드웨어(예 : Intel NUC 및 Pixhawk 4)와 데이터를 송수신을 위한 링크가 필요합니다.
FTDI USB 모듈과 레벨 시프터(하단 참조)같은 통신 브릿징이 가능한 몇가지 장치가 있습니다.
FTDI 장치
FTDI USB 어댑터는 일반적인 보조 컴퓨터와 픽스호크간의 통신 방법입니다. They are usually plug and play as long as the IO of the adapter is set to 3.3V. Pixhawk 하드웨어에서 제공되는 직렬 링크의 전체 기능와 신뢰성을 위하여 흐름 제어가 권장됩니다.
A few "turnkey" options are listed below:
| 장치 | 3.3v 입출력 (기본) | 흐름 제어 | Tx/Rx LED | JST-GH |
|---|---|---|---|---|
Capable | Capable | No | 예 | |
Yes | No | Yes | No |
You can also use an off-the-shelf FTDI cable like this one and connect it to flight controller using the appropriate header adaptor (JST-GH connectors are specified in the Pixhawk standard, but you should confirm the connectors for your flight controller).
논리 레벨 시프터
On occasion a companion computer may expose hardware level IO that is often run at 1.8v or 5v, while the Pixhawk hardware operates at 3.3v IO. In order to resolve this, a level shifter can be implemented to safely convert the transmitting/receiving signal voltage.
Options include:
카메라
Cameras are used image and video capture, and more generally to provide data for computer vision applications (in this case the "cameras" may only provide processed data, not raw images)
스테레오 카메라
Stereo cameras are typically used for depth perception, path planning and SLAM. They are in no way guaranteed to be plug and play with your companion computer.
Popular stereo cameras include:
관성 주행 시각 측정 카메라/센서
The following sensors can be used for Visual Inertial Odometry (VIO):
데이터 통신(LTE)
An LTE USB module can be attached to a companion computer and used to route MAVLink traffic between the flight controller and the Internet.
There is no "standard method" for a ground station and companion to connect over the Internet. Generally you can't connect them directly because neither of them will have a public/static IP on the Internet.
A common approach is to set up a virtual private network between the companion and GCS computer (i.e. install a VPN system like zerotier on both computers). The companion then uses mavlink-router to route traffic between the serial interface (flight controller) and GCS computer on the VPN network.
This method has the benefit that the GCS computer address can be static within the VPN, so the configuration of the mavlink router does not need to change over time. In addition, the communication link is secure because all VPN traffic is encrypted (MAVLink 2 itself does not support encryption).
Some USB modules that are known to work include:
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