[D405] Function of FSTROBE signal?
Hi Marty
I am looking for a signal on the D4 v4 or D401 depth module that can trigger an external short-duration strobe light pulse at the start of every frame exposure, so that objects moving at high speed can be imaged with minimal motion-blur. The FSTROBE signal (depth strobe signal) on pin 25 (table 3-38, page 55 of the April 2022 D400 series datasheet) appears to be what I am looking for, but its function is not explained. This signal is not present on the other D400 cameras, so I assume it is unique to the D4 v4 board. What exactly does this signal do ? Does it originate from the depth module or the D4 ? Thanks
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Hi Daniel Sirkett The FSTROBE depth strobe signal is undocumented aside from the short 'Depth Strobe signal' reference in the data sheet for the 400 Series cameras.
If you are aiming to generate a trigger signal from your D405 camera though then you could set the RealSense SDK instruction RS2_OPTION_OUTPUT_TRIGGER_ENABLED to '1' (enabled) with scripting. It enables / disables a trigger to be outputted from the camera to any external device on every depth frame
The instruction is also discussed at the link below.
https://github.com/IntelRealSense/librealsense/issues/9810
The trigger can be enabled in the RealSense Viewer by going to the Stereo Module > Controls section of the Viewer's options side-panel and left-clicking on the black box beside the Output Trigger Enabled option to turn the box's color from black (Off) to blue (On).
The chart below from the data sheet indicates that FSTROBE is on the depth module's 50-pin connector at pin 25.
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However, if you are experiencing motion blur then you could try setting the D405 to 848x480 resolution and 90 FPS to reduce it.
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