How to use a hardware trigger?

[miguelriemoliveira]

Hello,

I have a stereo system with two avt cameras.

I am using this ros driver (congratullations on your work), and I was wondering if its possible that this driver works when using a hardware trigger. Is it?

If so, could you tell me what should be done in order to make it work.

Thanks,

Miguel

[miquelmassot]

That is how we connect two AVT Manta cameras, one being master (fixed fps trigger) and other being slave (Line1 trigger)

Basicaly, select "Exposing" as signal in "SyncOut1" in master camera and "Line1" as trigger source for second camera. Connect Out1 from master camera to In1 of slave camera using a pulldown resistor (check your camera hardware manual, it may be different).

And this is a part of my configuration file:

# Left camera parameters
# Left is master camera -> FixedRate trigger source
left_frame_id: left_optical
left_trig_timestamp_topic: ''
left_acquisition_mode: Continuous
left_acquisition_rate: 7.5
left_trigger_source: FixedRate
left_trigger_mode: On
left_trigger_selector: FrameStart
left_trigger_activation: RisingEdge
left_trigger_delay: 0
left_ptp_mode: Master
left_sync_in_selector: SyncIn1
left_sync_out_polarity: Normal
left_sync_out_selector: SyncOut1
left_sync_out_source: Exposing

# Right camera parameters
# Right is slave camera -> Line1 trigger source
right_frame_id: right_optical
right_trig_timestamp_topic: ''
right_acquisition_mode: Continuous
right_acquisition_rate: 7.5
right_trigger_source: Line1
right_trigger_mode: On
right_trigger_selector: FrameStart
right_trigger_activation: RisingEdge
right_trigger_delay: 0
right_ptp_mode: Slave
right_sync_in_selector: SyncIn1
right_sync_out_polarity: Normal
right_sync_out_selector: SyncOut1
right_sync_out_source: Exposing

I hope this helps!

[miguelriemoliveira]

Hi Miquel,

Thanks so much for your help. We will try it.

If we have problems we will ask you about them, in the meantime I will close the issue.

Thanks once again.

Miguel