DJI Payload SDK
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The DJI Payload SDK (PSDK) is a modular library for Linux or RTOS that allows developers to create custom accessories for DJI drones, featuring tools for power management, data subscription, video streaming, and camera control. It uses components like the X-Port and SkyPort V2 for hardware connections and supports various functionalities through a structured interface. A specific example is the searchlight integration, which involves a C++ UI on a Raspberry Pi that facilitates user interaction with the drone's functionalities via the PSDK.
DJI Payload SDK
- 1. DJI Payload SDK Custom Searchlight Accessory
- 2. What is the DJI Payload SDK? - The PSDK is a library for linux or RTOS that can compile for several different cpu architectures. - The PSDK source is modular making it easy to “transplant” into your application. - DJI provides a development kit Payload SDK (PSDK) and development accessories X-Port, SkyPort V2 and SDK Round Ribbon Cable - The PSDK has the hardware and software tools needed to create your own accessories based on predefined standards
- 6. Features of the PSDK - Power Management - SDK Interconnection - Data Subscription - MOP Channels - HQ Video Streaming - Custom Widgets - Works with DJI Pilot easily - X-PORT Control - Media Management - Camera Features/Management - Basic functions: set camera mode, take pictures, record videos, get camera status - Advanced functions: pointing zoom, metering, focus - Advanced features: video streaming, media file playback and download - Gimbal Features/Management - Control the rotation speed and rotation mode of the gimbal - Set smoothing factor and maximum speed factor - Gimbal calibration, reset and angle fine- tuning
- 7. How the PSDK Works (1) - Hardware Connection - an X-PORT or SkyPort V2 to connect to a development board - The development board then connects to any other third-party boards via UART Serial or/and a network cable for high bandwidth applications Image from DJI Developer Quick-start guide
- 8. How the PSDK Works (2) - Pinout - Both X-PORT and SkyPort V2 have same pinout Image from DJI Developer Quick-start guide Pin Number Function 1 - 6 Power Supply 11, 12 Payload communication with drone 14 Time Sync (drone must have RTK) 15, 16 High-power apply 17 - 20 High-speed data transfer
- 10. Components - DJI XPORT gimbal - DJI Expansion Board with “Round Ribbon Cable” - 10W Led Light Kit from LED Supply Company - Raspberry PI Zero W 2 - 25vdc Relay, 1.2k Resistor, 2N4401 Transistor, X-30 power connectors - A whole lot of Blue ABS 3D Printer Filament
- 11. How the PSDK Works (3) - Searchlight Example - Order for how the searchlight interacts with PSDK/M300/Application: 1. Once a bound searchlight connects 2. The C++ UI widget initializes on the pi 3. The widget uses an internal PSDK bus to send messages over the serial bus 4. Once the widget has connected and DJI Pilot is showing the buttons 5. The C++ code on the pi receives button press events 6. A handler grabs these events 7. The event in the handler contains the ID of the button that was pressed 8. Logic in the handler uses these IDs to trigger specific actions, such as turning on and off the search light