# Need help with Arduino for Hagiwo VCO

**URL:** <https://lookmumnocomputer.discourse.group/t/need-help-with-arduino-for-hagiwo-vco/6900>\
**Category:** DIY STUFF\
**Created:** [January 13, 2024, 2:12pm UTC](https://lookmumnocomputer.discourse.group/t/need-help-with-arduino-for-hagiwo-vco/6900 "2024-01-13T14:12:18Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![AriaSalvatrice](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/ariasalvatrice/32/28804_2.png) [@AriaSalvatrice](https://lookmumnocomputer.discourse.group/u/AriaSalvatrice)\
**Post date:** [January 14, 2024, 7:02am UTC](https://lookmumnocomputer.discourse.group/t/need-help-with-arduino-for-hagiwo-vco/6900/18 "2024-01-14T07:02:23Z")

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I have a fair amount of experience with Nano+Mozzi & HAGIWO builds, they tend to work pretty well. Very forgiving circuit. Even designed my [prototype board for Mozzi](https://lookmumnocomputer.discourse.group/t/emozzi-an-experimentation-platform-for-arduino-nano-mozzi/6475) a while ago (i will do a v2 with fewer issues eventually)

In addition to Testbild’s schematic, you should consider cross-referencing Pansapiens’, which does things a bit differently, and is easier to read:

> **[GitHub - pansapiens/HAGIWO-Arduino-VDCO: Voltage Controlled Digital Core...](https://github.com/pansapiens/HAGIWO-Arduino-VDCO/)**
>
> Voltage Controlled Digital Core Multimode Oscillator using Mozzi library on Arduino - GitHub - pansapiens/HAGIWO-Arduino-VDCO: Voltage Controlled Digital Core Multimode Oscillator using Mozzi libra...

Don’t sweat the capacitors, except for the one in the output path, none of them make or break the circuit.

One gotcha you might run into that nobody seems to bother to document: Mozzi has to run in HIFI mode. You have to edit a C++ header to make that happen.

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