Hello guys, this is my first time posting here. I generally use ROVs (underwater drones) and with them ardusub firmware on a Pixhawk 2.4.8. Lately I’ve been working on putting some accessories on the ROV, those accesories have to be controlled by an on/off switch, in this case I am using an IRF 520 mosfet module, so I connected the Pixhawk aux port 6 (GPIO) with the mosfet module but the problem is that when I give the signal from the aux port 6, the mosfet module does not turn on, the gate is not opening completely, the mosfet module only delivers like 2 V to the accesory and should deliver 12 V. I checked the signal on the aux port 6 and seems OK, delivers like 3,27 V but at the beggining of the mosfet the signal decreases to approximately 2,4 V.
Also I realized that the gate opens fully when the pixhawk has few ports in use and does not work when it has all the ports in use ( we added gripper, lights and more thrusters).
The IRF 520 gate threshold voltage is min. 2 V and max. 4 V
I think that maybe could be the amperage.
I made the circuit with the IRF 520 because I think it fits well in there but any advice will be great received, maybe it can be replaced by a relay.
I hope you can help me,
have a good day and thanks.
Your mosfet THRESHOLD max voltage is 4V so you need at least 4V to be sure it opens fully.