2 OAK-D-PoE-w cameras hardware syncronization

OlaElmaghraby

I bought 2 cameras and I want to sync them using the M8 connector. in the documentation https://docs.luxonis.com/projects/hardware/en/latest/pages/guides/sync_frames/ it says that we can do the external sync using FSYNC as following:

cam_A.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)
cam_B.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)
cam_C.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)

but it looks like camA, cam_B and cam_C are 3 camera sensors inside one OAK Hardware how can I apply that to 2 oak cameras and where should I add these modifications?

jakaskerl

Hi @OlaElmaghraby
I suggest looking at this guide: https://docs.luxonis.com/projects/hardware/en/latest/pages/FSYNC_Yadapter/.

OlaElmaghraby where should I add these modifications?

These should be added to the code, rgb.initialControl.setFra.... for all three camera nodes you created in the script.

cam_A.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)
cam_B.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)
cam_C.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)

Thanks,
Jaka

OlaElmaghraby

jakaskerl According to the guide, they have a python script to coordinate the synchronization, how can I integrate that into the launch files in the ros driver?

OlaElmaghraby

OlaElmaghraby Also I am trying to follow the connection scheme of a master and slave where one camera acts as the master that outputs the 5V signal and the slave camera acts as input that takes 12V and in between there is an amplifier that transforms 5V to 12V but when we displayed the signal coming out of the M8 connector it was almost constant (I put the fps as 20 but the frequency of the output was in the 500-1000hz that's why I am saying almost constant), is the pin input by default and we need to set it as output?

jakaskerl

OlaElmaghraby
Setting continuous to false should set the mode to INPUT.
luxonis/depthai-rosblob/humble/depthai_ros_driver/src/param_handlers/sensor_param_handler.cpp#L162-L164

OlaElmaghraby Also I am trying to follow the connection scheme of a master and slave where one camera acts as the master that outputs the 5V signal and the slave camera acts as input that takes 12V and in between there is an amplifier that transforms 5V to 12V

The FSYNC signal is output shouldn't be 5V AFAIK.

OlaElmaghraby is the pin input by default and we need to set it as output?

Depends on which socket, I believe B is set to output by default.

Thanks,
Jaka

OlaElmaghraby

now I am trying to follow this scheme https://docs.luxonis.com/hardware/products/FSYNC%20Y-Adapter but the wiring is not clear as per this documentation it says "The signal line (BNC core) has to be connected to pin 1 of the M8 cable (FSYNC line). GND from the BNC connector (so the shielding around it) has to be connected to both pin 3 (GPIO3/5V) and pin 8 (GND) of the M8 cable" but the original M8 connector https://docs.luxonis.com/hardware/platform/deploy/m8_m12_connectors says pin3 is USB D+, not GPIO, where GPIO is pin 1.

Here is the cable coloring if you can tell me using the color code which one is the fsync, GPIO and isolated ground as they don't match the diagram at all then I will figure out the corresponding pins

Thanks

jakaskerl

OlaElmaghraby
Follow the scheme at https://docs.luxonis.com/hardware/platform/deploy/m8_m12_connectors.
The male M8 connector has different pin numbers and is mirrored. PIN3 on male connector corresponds to PIN7 on female, which is ISO GND.

Thanks,
Jaka