• State
  • Replies 2 replies
  • Subscribers 29 subscribers
  • Views 20 views
  • Users 0 members are here
Support feedback
Options
Options
Related

DLPLCRC900EVM: Timing for trigger

Mariana Falcao
Prodigy 20 points
Part Number: DLPLCRC900EVM
Other Parts Discussed in Thread: DLPLCR65EVM

Dear TI E2E Support Team,

I am working with a DLPLCRC900EVM assembled with a DLPLCR65EVM (same configuration shown here). The LED is driven by an external driver.

My goal is to display a single pattern for 1 second, with all timing controlled by an Arduino. The sequence is:

  • t = 0 s: Arduino starts the trial

  • t = 1 s: Arduino enables the LED (5 V HIGH to the LED driver) and simultaneously sends a 3.3 V HIGH signal to Trigger 1 on the DLP board (J20) to display the pattern

  • t = 2 s: Trial ends

I have two questions (see the schematic attached; GND is not connected for scheme simplicity):

  1. Is my triggering scheme complete as described in my printscreen? Do I also need to connect the LED enable signal to Trigger 2, or is using Trigger 1 sufficient for displaying a single pattern?

  2. How long should the Trigger 1 signal remain HIGH to reliably initiate the pattern display? Is there a recommended minimum pulse width?

Thank you very much for your help.

Best regards,
Marianaimage.png

  • 0
    TI__Genius 12835 points

    Hello Mariana,

    Thank you for coming to E2E for support here!

    Could you please advise what mode you are operating in or commands you have sent to set the system up?

    Best,

    Aaron

  • 0 in reply to Aaron Black
    Prodigy 20 points

    Hello, Aaron, 

    thank you for the fast response! 

    I am operating with pattern of the fly. I uploaded a pattern to the DLP using LightCrafter GUI and ticked the box that says “input trigger”. I put some ON time and 0 seconds for dark time, so the patterns plays non-stop for the whole time the led is on. So basically the mirrors are always in the same position, what changes is the led being on or off (which I control with the arduino and led driver). Now that I believe the pattern is uploaded, and waiting for the trigger to pass the pattern I want to make sure the connections are right (as displayed in the image of the previous question). I am not sending any signal to trigger 2 input of the DLP board, only to trigger 1 input. 

    NOTE: I never worked with this board before. The previous one broke and this is brand new but they are exactly the same model.  

    best, 

    mariana