PWM for gimbal using FPV ESC

[Dronodev]

Dear ModalAI Team,

We are currently trying to control a Caddx GM1 gimbal via PWM using our RC transmitter (TBS Tango 2 with Crossfire). As our flight controller, we are using the VOXL2 running PX4.
We read that it might be possible to generate a PWM signal using the 4-in-1 FPV ESC, which can be controlled via an RC input—could you confirm if this is correct? If not, what alternative options are available for generating a PWM signal?
We are planning to use the ModalAI ESC via UART, as well as the Crossfire Nano RX and a UART-to-USB adapter, which leaves us with no available interface for connecting the VOXL I/O board—would that be accurate?
We are aware that this topic has been discussed in various forum threads, but unfortunately we haven't been able to find a clear solution that fits our setup.
Thank you very much in advance for your help!

[Dronodev]

And is it possible to connect the i/o expander board (M0065) to the VOXL 2 WiFi Add-on board (MDK-M0141-1-01) to achieve a pwm output ?

[Eric Katzfey]

@Dronodev Using the M0065 on a UART on the WiFi add-on board may be the most straightforward way to do this. We've never tried to set one up like that but, in theory, it should work if configured correctly in px4. There is no direct way right now to send the RC channel PWM input out the VOXL esc PWM output. There are a number of different ways to approach that so we'll take a look and see if we can come up with something in the next couple of weeks.