I have a Mateksys f405-vtol (f405-te firmware) with a servo gimbal added to the build via the custom firmware builder. I can’t get the Ardupilot to query the device, which I have verified with an Oscilloscope. I have set servo4-servo8_function to GPIO, which covers all GPIO pins in Group 3 according to the datasheet. I am using servo 5 and 6 for trigger and echo, which correspond to GPIO 54 and 55. 5V and ground have been verified with the scope to ensure good power. I have also checked that the rngfnd1_max is 1 and rngfnd1_min is .1. Rngfnd1_type is HC-SR04. I’m really at a loss for why this isn’t working. I have tested the devices on an Arduino Uno.
Any ideas?