# custom micromod pcb

**URL:** <https://community.sparkfun.com/t/custom-micromod-pcb/42484>\
**Category:** PCB Design\
**Created:** [July 25, 2021, 10:13am UTC](https://community.sparkfun.com/t/custom-micromod-pcb/42484 "2021-07-25T10:13:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![PreciousRoy](https://avatars.discourse-cdn.com/v4/letter/p/f14d63/32.png) [@PreciousRoy](https://community.sparkfun.com/u/PreciousRoy)\
**Post date:** [July 25, 2021, 10:13am UTC](https://community.sparkfun.com/t/custom-micromod-pcb/42484/1 "2021-07-25T10:13:49Z")

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Hello,

I have been designing a custom micromod pcb witch i am qite new at making my own pcbs. i am having an issue seeing the usb port on the pc. i am using a rp2040 and then i press the boot button i can see that it goes in boot mode because the led does not start blinking when reset with boot pressed but i am not seeing it as a usb drive on the pc. on my ml-dev board the moment i plug it in i can hear my pc finding it but my on my pcb.

i was hoping one of you can have a look at my schematic and tell me what i am doing wrong. i checked for shorts and i am pretty sure there are none.

 ![pcb-shc.png](https://canada1.discourse-cdn.com/sparkfun/original/3X/4/2/42136a88394f845b1982e9957bb178f98d8b4b73.png)

 ![pcb-brd.png](https://canada1.discourse-cdn.com/sparkfun/original/3X/f/b/fb293c08ab9204793946abfe609489f6e602bc58.png)

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<div class="post-metadata">

**Author:** ![PreciousRoy](https://avatars.discourse-cdn.com/v4/letter/p/f14d63/32.png) [@PreciousRoy](https://community.sparkfun.com/u/PreciousRoy)\
**Post date:** [July 25, 2021, 2:11pm UTC](https://community.sparkfun.com/t/custom-micromod-pcb/42484/2 "2021-07-25T14:11:14Z")

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ok i think i found part of the problem. i did not have vin connected

![vin.png](https://canada1.discourse-cdn.com/sparkfun/original/3X/2/7/27eabe7b10f97bcbd248e0f384d8527323667f2d.png)  
so i did that and now something is happening on the pc but i get the error unknown device (i did notice that becouse of the diodes the voltage on vin is 4.7 but looking at [https://cdn.sparkfun.com/assets/9/7/b/3 … ematic.pdf](https://cdn.sparkfun.com/assets/9/7/b/3/c/MM_qwiic_carrier_single_schematic.pdf) its the same setup)

![unknown device.png](https://canada1.discourse-cdn.com/sparkfun/original/3X/0/8/0872c0f698b79703a8eeddc7d096db365888c2aa.png)  
do note i have the same rp2040 on ml-board and it works fine.