# Arduino Uno with CNC shield not connecting

**URL:** <https://forum.arduino.cc/t/arduino-uno-with-cnc-shield-not-connecting/1272793>\
**Category:** Motors, Mechanics, Power and CNC\
**Created:** [June 17, 2024, 8:34pm UTC](https://forum.arduino.cc/t/arduino-uno-with-cnc-shield-not-connecting/1272793 "2024-06-17T20:34:59Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![locutius](https://avatars.discourse-cdn.com/v4/letter/l/6a8cbe/32.png) [@locutius](https://forum.arduino.cc/u/locutius)\
**Post date:** [June 17, 2024, 8:34pm UTC](https://forum.arduino.cc/t/arduino-uno-with-cnc-shield-not-connecting/1272793/1 "2024-06-17T20:34:59Z")

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Hello, I'm currently building an Arduino CNC Plotter. For this I'm using steppers from old DVD drives, to controll them I use the Arduino CNC shield paired with an Arduino UNO. It already worked connecting them to my PC and controlling the stepper, but since a few days the Arduino is not recognised by the PC anymore when connected to the CNC shield. I already tried out different power supplies, but it still won't work. Anybody with an Idea for that? Thanks in advance

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**Author:** ![Railroader](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/railroader/32/274550_2.png) [@Railroader](https://forum.arduino.cc/u/Railroader)\
**Post date:** [June 17, 2024, 8:54pm UTC](https://forum.arduino.cc/t/arduino-uno-with-cnc-shield-not-connecting/1272793/2 "2024-06-17T20:54:15Z")

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> [@locutius](#):
>
> connecting

That calls for schematics showing the troubeling setup.  
Links to the shield and power supplies, please.

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**Author:** ![locutius](https://avatars.discourse-cdn.com/v4/letter/l/6a8cbe/32.png) [@locutius](https://forum.arduino.cc/u/locutius)\
**Post date:** [June 17, 2024, 9:09pm UTC](https://forum.arduino.cc/t/arduino-uno-with-cnc-shield-not-connecting/1272793/3 "2024-06-17T21:09:09Z")

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Sorry for forgetting that.

The power supply with which it had worked is just an adjustable supplie which I found at home. It has 600 mA and can be adjusted between 3 and 12 V. It worked with 12 V.

> **[CNC Shield V3 development board für A4988 Schrittmotor Treiber Stepper für 3D...](https://buyzero.de/en/products/cnc-shield-v3-development-board-fur-a4988-schrittmotor-treiber-stepper-fur-3d-drucker-und-arduino-uno-r3)**
>
> Überarbeitetes Shield passend für UnoR3, zum Betrieb von 3 Achsen mit bis zu 4 Schrittmotor Treibern. Ideal für 3D-Drucker oder kleine CNC-Maschinen. Zur Versorgung der Treiber mit bis zu 36V. Inc. Anschlussmöglichkeit für Endschalter,...

Thats the shield.

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**Author:** ![locutius](https://avatars.discourse-cdn.com/v4/letter/l/6a8cbe/32.png) [@locutius](https://forum.arduino.cc/u/locutius)\
**Post date:** [June 17, 2024, 9:18pm UTC](https://forum.arduino.cc/t/arduino-uno-with-cnc-shield-not-connecting/1272793/4 "2024-06-17T21:18:17Z")

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Problem is solved one of the drivers is faulty. It works if it is removed. Thank you

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**Author:** ![gilshultz](https://avatars.discourse-cdn.com/v4/letter/g/67e7ee/32.png) [@gilshultz](https://forum.arduino.cc/u/gilshultz)\
**Post date:** [June 18, 2024, 3:41am UTC](https://forum.arduino.cc/t/arduino-uno-with-cnc-shield-not-connecting/1272793/5 "2024-06-18T03:41:42Z")

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> [@locutius](#):
>
> Problem is solved

Welcome! Please mark it closed.

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [December 15, 2024, 3:42am UTC](https://forum.arduino.cc/t/arduino-uno-with-cnc-shield-not-connecting/1272793/6 "2024-12-15T03:42:08Z")

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