# Help with building HmIP-MOD-OC8

**URL:** <https://forum.fritzing.org/t/help-with-building-hmip-mod-oc8/16314>\
**Category:** parts help\
**Created:** [June 12, 2022, 7:50pm UTC](https://forum.fritzing.org/t/help-with-building-hmip-mod-oc8/16314 "2022-06-12T19:50:39Z")\
**Posts on this page:** 1\
**Showing post:** 8

<div class="post-metadata">

**Author:** ![BastianF](https://forum.fritzing.org/user_avatar/forum.fritzing.org/bastianf/32/13083_2.png) [@BastianF](https://forum.fritzing.org/u/BastianF)\
**Post date:** [July 17, 2022, 10:43am UTC](https://forum.fritzing.org/t/help-with-building-hmip-mod-oc8/16314/8 "2022-07-17T10:43:51Z")

</div>

@vanepp, I´m currently building the PCB board based on the part you helped me to build. During that I discovered a strange behavior, maybe you can help me to explain why that happen?

What I did (see board attachment at the bottom):

I added a single female header to pin2 (reset) on the ardunio:

 ![temp3](https://forum.fritzing.org/uploads/default/original/2X/1/1eb74ebbea6624e0245d66bdefe587555c66157b.jpeg)

However on the PCB its connected to the Pin24 on the HmIP-MOD-OC8:

 ![temp](https://forum.fritzing.org/uploads/default/original/2X/a/a2a17c547f95b90d207191f410bdf4f824ece2d6.jpeg)

When I move the pin in the PCB board a little bit lower it will jump to the Arduino:

 ![temp2](https://forum.fritzing.org/uploads/default/original/2X/4/4eef82c44051475d167fd9998c59c7535c0af4ad.jpeg)

Why is that happening?!?

P.S.  
Here are the files to reproduce the issue:  
[Arduino Nano Every.fzpz](https://forum.fritzing.org/uploads/short-url/wMFM9moO26BETpTqVjlHKg0GuJz.fzpz) (48.5 KB)  
[HmIP-MOD-OC8\_v0-10.3.fzpz](https://forum.fritzing.org/uploads/short-url/o4TRd4hdbA73AYGHIAaxR7PuVFF.fzpz) (24.7 KB)  
[Arduino\_HomematicIP\_Bridge\_v0.3.fzz](https://forum.fritzing.org/uploads/short-url/bxX1lAEeIoXvxZMesWKKFpa19MG.fzz) (101.0 KB)

Update:  
I think I found the issue. Inside the Arduino Nano is a strange BUS configuration build. I reported that here: [BUS bugs inside the Arduino Nano Every Fritzing part · Issue #11808 · arduino/Arduino · GitHub](https://github.com/arduino/Arduino/issues/11808)

looks like I learned a lot here so that I can now find bugs others did 😉

---

_[View the full topic](https://forum.fritzing.org/t/help-with-building-hmip-mod-oc8/16314)._