# HITL simulation with VOXL Flight

Source: https://forum.modalai.com/topic/767/hitl-simulation-with-voxl-flight
Category: Flight Core and Legacy VOXL (https://forum.modalai.com/category/9/flight-core-and-legacy-voxl)
Tags: voxl-flight
Posted: 2022-02-23 10:47:44 UTC by kasarrowtec
Replies: 3 · Views: 1089

## kasarrowtec · 2022-02-23 10:47:44 UTC

Hey,

I am trying to do a HITL simulation with a VOXL Flight - is this possible ? after following the instructions via - https://docs.px4.io/master/en/simulation/hitl.html  i keep getting preflight check errors with the compass sensor. If i connect a GPS receiver to the VOXL Flight deck will it work ? or do you guys have any advice on how to fake a GPS or a better solution for this ?

Best regards
Kas Arrowtec

## Reply by kasarrowtec · 2022-02-23 11:33:28 UTC

when i try to run ./Tools/jmavsim_run.sh -q -s -d /dev/ttyACM0 -b 921600 -r 250 i get a port busy error ?

## Reply by modaltb (ModalAI staff) · 2022-02-23 13:34:57 UTC

Hi @kasarrowtec ,

We have a video showing HITL with our HW here:

https://www.youtube.com/watch?v=-uoIxAkiYtk&t=1s

## Reply by kasarrowtec · 2022-02-23 14:27:35 UTC

Hi,

Thanks for the link, i have been following that tutorial but when i connect my voxl flight to Qgroundcontrol i get my drone is "not ready" . ive set it to HITL mode. It says one of the sensors need calibration but wont allow me to do it - 

![Capture.JPG](https://forum.modalai.com/assets/uploads/files/1645626431714-capture.jpg) 
![Capture1.JPG](https://forum.modalai.com/assets/uploads/files/1645626437840-capture1.jpg) 
![photo_2022-02-23_15-24-17.jpg](https://forum.modalai.com/assets/uploads/files/1645626315959-photo_2022-02-23_15-24-17.jpg)