# Klipper expander board Issue **URL:** \ **Category:** General Discussion\ **Created:** [February 18, 2024, 1:31pm UTC](https://klipper.discourse.group/t/klipper-expander-board-issue/14218 "2024-02-18T13:31:15Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Wattie](https://avatars.discourse-cdn.com/v4/letter/w/e47774/32.png) [@Wattie](https://klipper.discourse.group/u/Wattie)\ **Post date:** [February 18, 2024, 1:31pm UTC](https://klipper.discourse.group/t/klipper-expander-board-issue/14218/1 "2024-02-18T13:31:15Z")
### Basic Information: Printer Model: Mercury ONE.1 MCU / Printerboard: SKR Mini E3 `klippy.log`[klippy (9).log](https://klipper.discourse.group/uploads/short-url/cwkcmdzqMy0Sofrp7Y5QNCMjcq9.log) (715.1 KB) Hi all!!! I finally installed the Klipper expander board as I need the extra mosfets for my cabon filters. I Followed the manual here: [Voron-Hardware/Klipper\_Expander/Documentation/Setup\_and\_Flashing\_Guide.md at master · VoronDesign/Voron-Hardware · GitHub](https://github.com/VoronDesign/Voron-Hardware/blob/master/Klipper_Expander/Documentation/Setup_and_Flashing_Guide.md) However. Upon adding the KlipperExpander.cfg and included it in Pinter.cfg I get the following error message: **Klipper reports: ERROR** **Unknown pin chip name ‘expander’** **Once the underlying issue is corrected, use the “RESTART”** **command to reload the config and restart the host software.** **Printer is halted** which is strange as I copied the klipperexpander.cfg and only altered the serial in row 4. Is there someone that know whats going on here? ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [February 18, 2024, 3:07pm UTC](https://klipper.discourse.group/t/klipper-expander-board-issue/14218/2 "2024-02-18T15:07:51Z")
You seem to have omitted the last step in the guide: > Your board should now be usable with Klipper. Use the example config file to get started Best option is to copy the example config file into the same directory as `printer.cfg` then add `[include klipperExpander.cfg]` to the end of your `printer.cfg` to include the file. There is no trace of a correctly configured ```auto [mcu expander] serial: /dev/serial/by-id/usb-Klipper_stm32f042x6_350022000D43504735393520-if00 restart_method: command ``` ---
**Author:** ![Wattie](https://avatars.discourse-cdn.com/v4/letter/w/e47774/32.png) [@Wattie](https://klipper.discourse.group/u/Wattie)\ **Post date:** [February 18, 2024, 3:18pm UTC](https://klipper.discourse.group/t/klipper-expander-board-issue/14218/3 "2024-02-18T15:18:39Z")
Thanks for looking into this. I dont understand or I am missing something. I added the klipperexpander.cfg file in the same directory as printer.cfg. In printer.cfg i added [include klipperExpander.cfg] ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [February 18, 2024, 3:43pm UTC](https://klipper.discourse.group/t/klipper-expander-board-issue/14218/4 "2024-02-18T15:43:41Z")
Post both your `printer.cfg` and `klipperExpander.cfg` ---
**Author:** ![Wattie](https://avatars.discourse-cdn.com/v4/letter/w/e47774/32.png) [@Wattie](https://klipper.discourse.group/u/Wattie)\ **Post date:** [February 18, 2024, 4:51pm UTC](https://klipper.discourse.group/t/klipper-expander-board-issue/14218/5 "2024-02-18T16:51:43Z")
[config-20240218-175122.zip](https://klipper.discourse.group/uploads/short-url/oCq4KTmAIXJ9kGF4WRA3VLmsUiY.zip) (2.6 KB) see attached 🙂 ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [February 18, 2024, 7:41pm UTC](https://klipper.discourse.group/t/klipper-expander-board-issue/14218/6 "2024-02-18T19:41:44Z")
In `klipperExpander.cfg`: ```auto [mcu] serial: /dev/serial/by-id/usb-Klipper_stm32f042x6_040024000C43303054313620-if00 restart_method: command ``` needs to be (as also required in the example config): ```auto [mcu expander] serial: /dev/serial/by-id/usb-Klipper_stm32f042x6_040024000C43303054313620-if00 restart_method: command ``` Verify that this is actually correct and your expander board is flashed with the correct settings ---
**Author:** ![Wattie](https://avatars.discourse-cdn.com/v4/letter/w/e47774/32.png) [@Wattie](https://klipper.discourse.group/u/Wattie)\ **Post date:** [February 19, 2024, 8:07pm UTC](https://klipper.discourse.group/t/klipper-expander-board-issue/14218/7 "2024-02-19T20:07:12Z")
managed to make it work! Indeed the following error was: [mcu] instead of [mcu expander]. Changed it. Klipper is now recognizing it! Thanks for the insight! ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [March 21, 2024, 6:07am UTC](https://klipper.discourse.group/t/klipper-expander-board-issue/14218/8 "2024-03-21T06:07:21Z")
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