Using relay with a pixhawk 1

ArduRover Rover 4.6
1

I have a relay , it is powered separately (5v) and accepts a 3.5V input. On the Pixhawk, I have a the signal pin connected to the right most signal pin or aux output (pin 50). I see the user parameters start at RC6, but the documentation indicates that I can also use RC5. Do I need to change something with the servo channels also?

RELAY1_DEFAULT,0
RELAY1_FUNCTION,1
RELAY1_INVERTED,0
RELAY1_PIN,50


RC5_DZ,0
RC5_MAX,2000
RC5_MIN,999
RC5_OPTION,28
RC5_REVERSED,0
RC5_TRIM,999

My radio FLYSKY i6 is set with channel 5 as swA.

2

Relay outputs are 3.3Vdc. What relay is it that accepts PWM? A common PWM switch?

3

Sorry typo - 3.3v input is correct- not pwm.

I was thinking about whether or not I should try the pwm outputs vice the aux outs…

4

No sense to that. What Relay do you have? Just answering the questions asked will speed up the solution.

5

I have solved this - . I think I understand the servoX remapping to -1 for GPIO for a particular Aux Output. I tried to set SERVO5 -1(GPIO) and that did not seem to support using output pin 50.

Resolution: I set Servo9_Function to - 1, and restarted the FC by unplugging from power. For whatever reason using CTRL-F/reboot pixhawk did not reset the servo mapping.

If I have it right for the pixhawk.
SERVO10-13 - should map to pin 51-55 of the aux_output.
SERVO1-8- maps to main pwm outputs

Map a RC#_option be a relay,
Assign a relay# and set the correct output pin for the relay#
Assign the correct servo# based on the assigned output pin.