4500 external trigger sequence

Sean Tan

Other Parts Discussed in Thread: DLPC350

Dear Sir/Madam,

I'm using external trigger to trigger lightcrafter 4500. If the lightcrafter pattern exposure & period is set to 8333us with 4 patterns. Will it have any side effect if my triggering signal is 4000us for that 4 pattern?

In exact it will be 4000us, 1000us(interval), 4000us, 1000us(interval), 4000us, 1000us(interval)4000us. Will the 2nd signal make the projector to project second pattern, while first image is not done projecting?

Thanks.

over 8 years ago

0 Paul Goedeke over 8 years ago

TI__Mastermind 30600 points

Hi Sean,

If you are setting each pattern to have an exposure of 8333us and your trigger signal is 4000us, you will cut your current pattern short and start displaying the next pattern. Because you selected 8333us, I assume you're using 8bit images? If that's the case, then you would not get the full 8bit resolution with a shorter trigger time than exposure time.

I'm not quite following what you mean by "4000us, 1000us(interval)...." could you explain further?

Thanks!
Paul

0 Sean Tan over 8 years ago in reply to Paul Goedeke

Prodigy 230 points

Hi Paul,

The 1 ms interval is the additional time added in between each 4ms signal. I'm putting it high for each signal for 4ms.

I'm projecting 4 images, in 1, 2, 3, 4 order. If in the middle there's interruption on the system, how can I reset the projection sequence to start all over again?

Thanks.

0 Paul Goedeke over 8 years ago in reply to Sean Tan

TI__Mastermind 30600 points

If there is an interruption you'll have to stop the sequence and start it over again to make sure that the sequence starts at the beginning. The commands for starting and stopping can be found in the DLPC350 programmer's guide: http://www.ti.com/lit/ug/dlpu010f/dlpu010f.pdf

You can also look at the GUI source code to see how it is implemented there.

-Paul

0 Sean Tan over 8 years ago in reply to Paul Goedeke

Prodigy 230 points

Got it, thanks.

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4500 external trigger sequence