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FSYNC Y-Adapter

Based on
RVC
Connection
Dot projector
No
Infrared
No
IMU
None

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Overview

FSYNC Y-adapter allows users to easily [hardware synchronize](Hardware message syncing) multiple devices that have M8 auxiliary connector. If cameras are hardware synchronized, they will all start sensor exposure at the same time for each frame.Devices that have M8 auxiliary connector:

Getting Started

One can daisy-chain multiple OAK cameras as per wiring schematics below. Multiple cameras can be daisy-chained.OAK-D-SR-POE that doesn't have a cable connected to "IN" port (M8 female connector) will output FSYNC signal automatically and will therefore be the "FSYNC Host" device, while devices that have a cable connected to "IN" port will be "FSYNC Peripheral" devices.

FSYNC results

Exposure time is low (manual exposure set), so TS difference (TS is from the middle of the exposure) is minimal:Auto-Exposure, TS difference is a bit larger (13ms), as color sensors have ~25ms longer exposure time (and we take middle of exposure, so /2):Hardware syncing 4x OAK PoE cameras. Manual exposure of 6ms for color cameras, 1ms mono cameras:Script used can be found here. We used External FSYNC signal in this case, as we tested it with 2x OAK-D Pro PoE cameras. The mobile phone screen was set to 120 Hz refresh rate.

External FSYNC signal

Current S2 OAK POE require between 10V-24V on M8 FSYNC line in order to trigger the camera. This means that you can't directly daisy chain multiple OAK cameras (where one is the "FSYNC Host" and others are "FSYNC Peripherals"), but a an external 10V+ FSYNC signal is required, such as from a signal generator.Future S2 OAK POE devices (ETA Q2 2024) won't require external FSYNC signal, and will be able to daisy-chain multiple cameras directly (as per Getting Started section).One could also use level shifter to convert 5V output (from "FSYNC Host device") to 10V.
Wiring diagram
Photo of the wiring
BNC to M8 adapter
Python
1# One needs to set the FSYNC mode to INPUT to all camera's sensors:
2cam1 = pipeline.create(dai.node.MonoCamera)
3cam1.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)
4
5cam2 = pipeline.create(dai.node.ColorCamera)
6cam2.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)
7# ...

Dimensions and Weight

  • Weight: 5g
  • Width: 23.5 mm
  • Height: 33 mm
  • Length: 10 mm