Issues with PPS Input and Trigger Output on Flir LadyBug 5+
Hello everyone,
I'm currently experiencing some issues with the PPS input on my Flir LadyBug 5+ camera and I'm hoping to get some advice from the community.
Here's my setup:
- GPS: Novatel PwrPak7
- PPS Signal: Outputting at 1ms with polarity set to low (rising edge)
- Verification: Signal verified with an oscilloscope
- Connection: PPS signal connected to the yellow IO3 (Input/Output / PPS signal) wire of the LB5+
- Ground: Signal ground connected to the bare wire
- Software: LadyBugCapPro
- USB Connection: Connected to the PwrPak7 on COM4 with a baud rate of 4800. It correctly reads the latitude, longitude, and speed.
Here are the issues I'm facing:
-
PPS Input Issue:
- When I turn on the option for GPS > Start GPS Time Sync, the status shows "GPS Time: 0, PPS: 0, Quality: 15". I understand these should show 1 if the signal is working correctly, but I'm not sure what the "15" quality value means.
- I temporarily set the camera trigger to IO3 to test if the input works, and it triggers as expected each second.
-
Trigger Output Issue:
- I tried using GPIO1 as a strobe output with no success. I didn't observe any changes on the oscilloscope. I used the brown wire and configured the Camera Control Trigger/Strobe Settings with GPIO 1 defined as Out, Strobe Control Enabled, Polarity Low, Delay 0.00, and Duration 10.00.
Additional Information:
- I am wondering if the GPIO needs GPS data through a specific connection type other than USB (perhaps directly via RS232) for the PPS input to function correctly. I plan to try an RS232 to TTL converter for this.
- I've also tested these settings while recording but still haven't had any luck.
Main Questions:
- Why is the PPS input not registering correctly despite the correct signal and connections?
- Why is the trigger output not working as expected?
Any insights or suggestions would be greatly appreciated!
Thank you!
-
Hi Alex,
For PPS time sync to work the camera also has to receive the NMEA data over GPIO. Please see https://www.flir.com/support-center/iis/machine-vision/application-note/using-pps-to-synchronize-with-external-gps/
O1/brown is an opto-isolated output. Did you use OPTO_GND/green as ground? Also, you have to use a pullup resistor to get a readable signal. Please see section 6.4 12-Pin GPIO Electrical Characteristics in the technical reference: https://www.flir.com/support/products/ladybug5plus/?vertical=machine+vision&segment=iis#DocumentsBest regards,
Manuel
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