# Adding a filament runout sensor? **URL:** \ **Category:** Sovol SV02\ **Created:** [July 30, 2022, 9:07am UTC](https://forum.sovol3d.com/t/adding-a-filament-runout-sensor/484 "2022-07-30T09:07:36Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![KazeOne](https://avatars.discourse-cdn.com/v4/letter/k/59ef9b/32.png) [@KazeOne](https://forum.sovol3d.com/u/KazeOne)\ **Post date:** [July 30, 2022, 9:07am UTC](https://forum.sovol3d.com/t/adding-a-filament-runout-sensor/484/1 "2022-07-30T09:07:37Z")
So I was looking at the break down of all the board connections and one of them is for a filament sensor, now granted I understand that we have two extruders but I was wondering if we could still hook up one sensor for our main spool which is what I primarily use most as my second spool is used just for PVA for support interface, or if we can daisy chain both filament sensors into the one plug? Now if the answer is yes to either of the two options mentioned above, then my next question would be will the firmware natively detect and support the sensor or would we have to compile new firmware? Last option is there a standalone filament sensor that doesnt report to the board at but has like flashing led or an alarm when it detects that filament has ran out? ---
**Author:** ![edhor](https://avatars.discourse-cdn.com/v4/letter/e/dbc845/32.png) [@edhor](https://forum.sovol3d.com/u/edhor)\ **Post date:** [August 14, 2022, 7:37am UTC](https://forum.sovol3d.com/t/adding-a-filament-runout-sensor/484/2 "2022-08-14T07:37:27Z")
did you find a response . i need a similar solution ---
**Author:** ![KazeOne](https://avatars.discourse-cdn.com/v4/letter/k/59ef9b/32.png) [@KazeOne](https://forum.sovol3d.com/u/KazeOne)\ **Post date:** [August 14, 2022, 8:54pm UTC](https://forum.sovol3d.com/t/adding-a-filament-runout-sensor/484/3 "2022-08-14T20:54:45Z")
No response as of yet from anyone or Sovol but filament sensors are cheap enough that I may just buy one and wire it in and see what happens. ---
**Author:** ![KazeOne](https://avatars.discourse-cdn.com/v4/letter/k/59ef9b/32.png) [@KazeOne](https://forum.sovol3d.com/u/KazeOne)\ **Post date:** [August 25, 2022, 8:29pm UTC](https://forum.sovol3d.com/t/adding-a-filament-runout-sensor/484/4 "2022-08-25T20:29:14Z")
I bought the filament sensor but before I got a chance to test this out, the SV04 refurb was available so I pulled the trigger and bought that and sold by SV02 to a coworker, so I no longer have the SV02 to test this out on, apologies.