Simple PWM Filter PCB Build Guide

Here are the build notes for my Simple PWM Filter PCB Design. Below you can see it connected to my Pico Touch Board. Warning! I strongly recommend using old or second hand equipment for your experiments. I am not responsible for any damage to expensive instruments! If you are new to electronics and microcontrollers, see the Getting … Continue reading Simple PWM Filter PCB Build Guide →

Simple PWM Filter PCB Design

Having spent a bit of time attempting (although I'm not sure I'm succeeding yet) to understand how to get a useful filter for my Pico Touch Board Audio, I thought it would be useful to have a simple template PCB that could be used for a range of PWM low-pass filtering options. This is my design. … Continue reading Simple PWM Filter PCB Design →

XIAO SAMD21, Arduino and MIDI – Part 4

One of the nice things about the SAMD21 based microcontrollers like the XIAO is the embedded USB support. Whilst it can make the uploading a little, er, interesting, it also allows for the building of USB devices. This post looks at how to turn the XIAO into a USB MIDI device for more MIDI routing. … Continue reading XIAO SAMD21, Arduino and MIDI – Part 4 →

XIAO SAMD21, Arduino and MIDI – Part 3

In this post I wire up the DAC and start up Mozzi using my Arduino Multi-pot Mozzi FM Synthesis on the Seeedstudio XIAO SAMD21 board (previously known as the Seeeduino XIAO). Previous parts in this series: Part 1 - Introduction to the XIAO SAMD21 and some projects to get started. Part 2 - Looking at accessing … Continue reading XIAO SAMD21, Arduino and MIDI – Part 3 →

Arduino MIDI Channelizer

This project kicked off from a comment in the "Audio/Midi/DMX using Arduino" Facebook group, where someone wanted to know if an Arduino could receive messages on one channel and change the channel number and send them back out. The answer is yes and this is how it could be done. I've based it on my Arduino … Continue reading Arduino MIDI Channelizer →

Arduino PWM Output Filter Circuit – Part 2

I've been using my solderless breadboard version of my Arduino PWM Output Filter Circuit quite a lot so thought it might be useful to commit it to protoboard and build it onto a simple shield. Warning! I strongly recommend using old or second hand equipment for your experiments. I am not responsible for any damage to … Continue reading Arduino PWM Output Filter Circuit – Part 2 →

Arduino PWM Output Filter Circuit

There have been a number of occasions now where I've added a low-pass filter and voltage divider to my Arduino-based PWM outputs so I thought it was worth pulling that together into a single post to make it easy to refer to elsewhere. This is that post. There is nothing new here, it is just … Continue reading Arduino PWM Output Filter Circuit →

Universal Microcontroller MIDI Module

It's been a while since I built a MIDI module... actually, I need the "raw electronics" from a MIDI In/Out interface for a project I'm planning, and wanted it to support either 3.3V or 5V microcontrollers, so this little project was the result. While I was at it, I thought I'd add in a low-pass … Continue reading Universal Microcontroller MIDI Module →

Mozzi Output Circuit – Part 2

The simple Mozzi Output Circuit is fine for experimenting but when it comes to combining signals it can really do some damage - I may have trashed the small amp I was using for my experiments - remember my warning - I strongly recommend using an old or second hand keyboard for your MIDI experiments. I … Continue reading Mozzi Output Circuit – Part 2 →

Mozzi Output Circuit

As part of the Arduino Multi-pot Mozzi FM Synthesis project I put together a simple Mozzi output filter circuit, but it stopped working. After having a bit of a look and poke about it it turns out that the jack socket was faulty, so I ordered a different type of socket and started again. This is … Continue reading Mozzi Output Circuit →