Controlling Relay with joystick

[Eren_Gundogan (Eren Gündoğan)]

Hello,
I use a Pixhawk PX4 with Rover V4.5.7 installed with boat configration, I also use a Xbox 360 controller and a radio telemetry module to control it manually (GHz modules are not allowed in the project’s specification which our team is going to attent, hopefully).

I use Differential thrust boat configration for our teams project, I managed to control left aft and right aft thrusters with no problem. But our team also decided to use a bow thruster for docking and assisting turning maneuvers, I was able to adress the bow thruster on RC5 but it doesn’t stop when unarmed. So I decided to use this to my adventage, when our vessel dock we can unarm main thrusters and turn on the bow thruster seperately for fine manuvering. To do this I decided to add a relay module.

But the problem is that I can’t turn of the relay no matter what I do. I set the relay 1 pin to 54 (Aux out 5) and then I set the servo 13 function to gpio, this way I was able to flicker the relay when the relay 1 state was set to high for some reason. When it was set to high the relay

modules led gets a bit dimmer but never turns off, also the relay doesn’t turn off; it flickers a bit after a while (Probably coil gets too little power so the relay’s pin goes crazy).

So I need your help to adress this issue, thank you.

[dkemxr (Dave)]

You have a 5V coil relay and the Pixhawk relay output is 3.3V

[geofrancis ([𝙂𝙚𝙤])]

The blue relay boards don’t work on flight controllers. Use the red relay modules with the jumpers set to input high

[Eren_Gundogan (Eren Gündoğan)]

Thank you for your reply, We are going to use a solid state relay to do the work (To avoid false triggers). I will now look for 3v solid state relays. I was also able to make a proof of concept with my current relay using a transistor to amplify the aux5 signal, it did work (but the transistor burned after a while :D)