Hi,
I have a set of light (not the lumens) and i wanted to activate them on demand.
I have a BR2 with the PIXHAWK, do i need to look for a relay ?
If yes do you now voltage of the PWM pins out of the pixhawk ? 3.3V or 5.5v ?
If you have used a relay for a similar purpose, i am interested in knowing which one you used.
Thank you very much
eric
Hi @eric84200 -
The pixhawk outputs 3.3V signals. It may be possible to use the lights, but more information is required. Are the lights controlled via a PWM signal, or are you simply trying to turn them on and off? If the latter, a solid-state relay that can be triggered by the low 3.3V signal is all you should need - see instructions here. These instructions should work for both the Navigator and the Pixhawk.
Hi Tony, thanks for your answer it is exactly the answer i was looking for 
Simply trying to turn them on and off
Have a good day
eric
Hi,
Unfortunately i have not succeed to trigger my relay…
As i connect the relay to the pixhawk it immiadiately switches on.
i tried all the aux port on my pixhawk and i have the same problem… it looks like signal is high on all aux ports.
you will find below pictures of my settings and i tried many others…
Do you have any idea on how to figure this out ?
thanks
eric
Hi @eric84200 -
I think the issue is using AUXOUT pin - try just putting the pin # of the channel you’re trying to use to control the relay (what channel is this?)
So you’ll set
RELAY1_FUNCTION to 1
and
RELAY1_PIN to 12 (if using AuxOut4)
Just like the picture in the instructions linked:
HI tony, i don’t see any RELAY1_FUNCTION
I only have the ones on my first picture…
Hi @eric84200 -
That’s strange - what version of ArduSub are you using?
Maybe try typing out Relay1 in the search field - you stopped part-way…
Hi @tony-white, version is : 4.1.2
should i upgrade it ?
You will see nelow the screenshot of what i get on autopilot parameters when i write RELAY1
Thanks for your time.
Eric
Hi again, so i upgraded my autopilot and this is what i get.
I changed settings as you mentioned before but can’t get it working… i attached a picture of the settings i have from autopilot parameters.
my relay is connected onto aux 4 on the pixhawk.
i tried all the others aux port too to be sure.
As soon as i connect it the relay triggers…
this is the one i use : Amazon.com: Teyleten Robot DC 1 Channel Optocoupler 3V/3.3V Relay High Level Driver Module Isolated Drive Control Board 3V/3.3V Relay Module for Arduino (Pack of 5) : Industrial & Scientific
thanks for your help
eric
Hi @eric84200 -
Can you share some pictures or a diagram of how you are wiring in that relay?
Does the state change if you change the Default?
Updating to 4.5 + on Pixhawk can cause issues, but may be worth a try. If it doesn’t update from BlueOS, you’ll need to connect the Pixhawk directly to your computer and use QGC to update (or downgrade if the update doesn’t get things working for you.)
Hi @eric84200 -
That looks right, but I’d be interested to know where you’re tapping into 5V power - you wouldn’t want your driven load to interfere with the power to BlueOS!
Checkout this forum thread - it seems like you may need to use another port for this to work on Pixhawk…
Hi tony my 5v comes out from a bec which supplies also the companion.
i downgrade my pix firmware and touched some setting and i got it to work on aux 5. after readind the forum thread you mentioned above.
thanks for your help.
now i need to set back up every settings since i reset to factory almost everything 
