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RE: DLP2010EVM-LC: Trigger Questions

Shravani Erukala
Intellectual 385 points

Hi Kyle,

I am facing problem with external trigger. The following jumpers were placed 

  1. pin 1&2 of J11 of main board (for 1.8 V)
  2.  pin 2&3 of J3 of display board (for light control application)

Using GUI stored the patterns - program pattern data and enabled trigger_in and pattern ready to active low, 

Now the voltage reading at pin3 (pattern ready) of J4 of display board is 0.011V and pin5 (trigger-in)of J4 of display board is sometimes 2.7-3.2 V. When I connevt the pin5 to GND it must trigger my pattern projection,right? But it actually stops projection. Can you help me in identifying what is that I am doing wrong?

Thank you

  • 0
    TI__Mastermind 20045 points
    Hello Shravani,

    I have split your question into a new thread to better address it.

    Can you confirm the output trigger works properly without using an input trigger? After that has been confirmed could you tell me what the input trigger signal is to the pin? If you are able to upload the waveforms as well that would help.

    Thanks,
    Kyle
  • 0 in reply to Kyle Rakos
    Intellectual 385 points

    Hi Kyle,

    Actually here is a small video of my problem. Connected resistor 10k between trigger in and gnd of J4 of display board. It takes trigger but I get this unwanted projection. In this video I have just used one pattern which is vertical one. But as you see i get another unwanted projection. Configured the trigger-in for active high using gui then using push button I send the trigger for high. Please correct if I am doing this wrong or any other suggestions. If video is not proper please use this link as alternative   

  • 0 in reply to Shravani Erukala
    TI__Mastermind 20045 points
    Hello,

    It's possible you need to debounce your button. Perhaps that is causing the DLP to rapidly cycle through pattern projection. Could you also upload a screenshot of the "Pattern Sets" and "Pattern Set Order" page of the GUI? That way I will know how you are programming the EVM.

    Thanks,
    Kyle
  • 0 in reply to Kyle Rakos
    TI__Mastermind 20045 points
    Hi Shravani,

    I was able to replicate your issue by using a function generator to feed an input trigger at a higher frequency than 1 / (pre-exposure time + exposure time + post-exposure time). My guess is your manual switching is faster than this maximum frequency. You may try debouncing it or feeding it into a separate microcontroller first to ensure you are not trying to change the trigger too fast.

    Thanks,
    Kyle