# HIL actuators not working on PX4 V1.15.4 **URL:** \ **Category:** PX4 Autopilot\ **Created:** [July 21, 2025, 6:55am UTC](https://discuss.px4.io/t/hil-actuators-not-working-on-px4-v1-15-4/46594 "2025-07-21T06:55:10Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![fly\_check](https://discuss.px4.io/letter_avatar_proxy/v4/letter/f/a88e4f/32.png) [@fly\_check](https://discuss.px4.io/u/fly_check)\ **Post date:** [July 21, 2025, 6:55am UTC](https://discuss.px4.io/t/hil-actuators-not-working-on-px4-v1-15-4/46594/1 "2025-07-21T06:55:10Z")
Hi, I have been wanting to test my code on HIL platform and as it turns out when I establish all the necessary connections and provide inputs through actuators tab, I do not see them moving. I checked the forum for solutions and it seems, they have solved for versions v1.14.0 and v1.13.3 however, for v1.15.4 I am not able to find a fix. Since rc.interface file is not there, state\_machine\_helper.cpp is not there and plenty other files are not there in v1.15.4. Anyone with a solution for this? [@DevTeam](https://discuss.px4.io/groups/devteam) ---
**Author:** ![fly\_check](https://discuss.px4.io/letter_avatar_proxy/v4/letter/f/a88e4f/32.png) [@fly\_check](https://discuss.px4.io/u/fly_check)\ **Post date:** [July 22, 2025, 7:55am UTC](https://discuss.px4.io/t/hil-actuators-not-working-on-px4-v1-15-4/46594/2 "2025-07-22T07:55:07Z")
@JulianOes any thoughts on this? ---
**Author:** ![JulianOes](https://discuss.px4.io/user_avatar/discuss.px4.io/julianoes/32/30_2.png) [@JulianOes](https://discuss.px4.io/u/JulianOes)\ **Post date:** [July 22, 2025, 8:45pm UTC](https://discuss.px4.io/t/hil-actuators-not-working-on-px4-v1-15-4/46594/3 "2025-07-22T20:45:28Z")
Please don’t @ mention people or teams, it’s rude. Whoever sees something and knows an answer will respond. HIL isn’t very well supported I’m afraid. You will have to do some debugging to figure out what is going on. Otherwise, I can recommend to use SIH which works pretty well out of the box. ---
**Author:** ![fly\_check](https://discuss.px4.io/letter_avatar_proxy/v4/letter/f/a88e4f/32.png) [@fly\_check](https://discuss.px4.io/u/fly_check)\ **Post date:** [July 23, 2025, 5:20am UTC](https://discuss.px4.io/t/hil-actuators-not-working-on-px4-v1-15-4/46594/4 "2025-07-23T05:20:36Z")
Thanks for the response and apology for the tags! I saw the SIH documentation and it seems like that for VTOL, that feature is available from v1.16. I am currently using stable v.1.5.4 I am working on a simulink based simulator and I am not sure if SIH for that will really work. Will it? ---
**Author:** ![JulianOes](https://discuss.px4.io/user_avatar/discuss.px4.io/julianoes/32/30_2.png) [@JulianOes](https://discuss.px4.io/u/JulianOes)\ **Post date:** [July 23, 2025, 10:23pm UTC](https://discuss.px4.io/t/hil-actuators-not-working-on-px4-v1-15-4/46594/5 "2025-07-23T22:23:58Z")
> [@fly\_check](#): > > I am working on a simulink based simulator and I am not sure if SIH for that will really work. Will it? Probably not. Are you using the Mathworks UAVtoolbox for this? ---
**Author:** ![fly\_check](https://discuss.px4.io/letter_avatar_proxy/v4/letter/f/a88e4f/32.png) [@fly\_check](https://discuss.px4.io/u/fly_check)\ **Post date:** [July 29, 2025, 5:10am UTC](https://discuss.px4.io/t/hil-actuators-not-working-on-px4-v1-15-4/46594/6 "2025-07-29T05:10:54Z")
Yes. I tried everything i could, have not found any luck so far ---
**Author:** ![system](https://discuss.px4.io/uploads/default/original/3X/7/3/73ce918bdcd64854de904f0c8d9ab70ca9723f2a.png) [@system](https://discuss.px4.io/u/system)\ **Post date:** [October 27, 2025, 5:11am UTC](https://discuss.px4.io/t/hil-actuators-not-working-on-px4-v1-15-4/46594/7 "2025-10-27T05:11:02Z")
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