FSYNC Y-adapter allows users to easily hardware synchronize 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:
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.
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:
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.