[Elphel-support] General discussion about trigging

[Alexandre Poltorak]

Jeff,

I do not see any problem in using the external trigger in this way.

You can program all cameras as slaves and trig them from an external device. At the RMLL workshop I made the demo with a GPS, it was triggering frames at 1s interval, but it could be 20s, 10s, or whatever and not necessary periodic. Of course the network streamer does not work well with such needs, but camogm should do it's job.

Best regards,
Alexandre

----- Mail original -----
De: "jeff witz" <witzjean at gmail.com>
À: support-list at support.elphel.com
Envoyé: Mardi 21 Juin 2011 08:33:01
Objet: Re: [Elphel-support] General discussion about trigging

Dear Elphel developpers,

We have several cameras that works well for almost all our goals, but
there is one issue that causes real interrogations. For a majority of
our vision applications it is important to be able to master perfectly
the time when a frame is made. Of course we know the process that
allows one to trig the camera by internal or external trigger. But we
think that there is an issue that must be treated in order to allows
us to use our cameras in he best conditions. The problem comes from
the the way the trigger is made, indeed, if we set external trigger
then if we wait over a sensor idle time, the camera looses the
synchronization with the sensor. In our applications the trig of a
frame depends of "physical" events which are not periodic. So we
really need to have an external trigger which is able for example to
wait 20s. then trig 10 in  1s. then wait a min. Of course we can
achieve this by the arduino trig version that Alexandre made, but the
timestamp really matter for us.

Do you have any Idea that allows us to reach this goal.

Best regards.

_______________________________________________
Support-list mailing list
Support-list at support.elphel.com
http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com