# Help with connecting custom longmill to UNO + tb6600s

**URL:** <https://forum.sienci.com/t/help-with-connecting-custom-longmill-to-uno-tb6600s/5878>\
**Category:** 🛠️ Assembly\
**Created:** [May 17, 2022, 3:29am UTC](https://forum.sienci.com/t/help-with-connecting-custom-longmill-to-uno-tb6600s/5878 "2022-05-17T03:29:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dharmesh](https://forum.sienci.com/letter_avatar_proxy/v4/letter/d/58956e/32.png) [@Dharmesh](https://forum.sienci.com/u/Dharmesh)\
**Post date:** [May 17, 2022, 3:29am UTC](https://forum.sienci.com/t/help-with-connecting-custom-longmill-to-uno-tb6600s/5878/1 "2022-05-17T03:29:42Z")

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Hi,  
I have been working on a Longmill from scratch and am done with the mechanical assembly. For the control board I have an arduino UNO with 4 tb6600s. I am unable to figure out manual wiring for the same through the provided longboard documentation because I don’t have a fair knowledge of PCBs. Is there anyone who has connected it or can help with manually wiring the longmill 4 motors to the stepper drivers and UNO? If so kindly guide.

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**Author:** ![JHahn](https://forum.sienci.com/letter_avatar_proxy/v4/letter/j/8edcca/32.png) [@JHahn](https://forum.sienci.com/u/JHahn)\
**Post date:** [May 17, 2022, 8:54am UTC](https://forum.sienci.com/t/help-with-connecting-custom-longmill-to-uno-tb6600s/5878/2 "2022-05-17T08:54:59Z")

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When using GRBL, just google for “grbl pinout”. There are several pictures to identify the wiring.