Single Pin MIDI Channel Selector

One thing that has been missing from all of my MIDI projects so far is some means of configuring the MIDI channel without having to reload code. There are a number of approaches, but I wanted one that used the minimal amount of IO. This documents one option. In part 2 I build this into … Continue reading Single Pin MIDI Channel Selector →

Simple Potentiometer Breakout

I've been using potentiometers quite a bit in recent projects and now have two boards that include options to link out to potentiometers to control boards too, so thought it useful to have another, smaller, breakout to make experimenting easy. Warning! I strongly recommend using old or second hand equipment for your experiments. I am … Continue reading Simple Potentiometer Breakout →

556 Timer Light Theremin

I found this "Atari Punk Light Theremin" circuit which uses a 556 timer chip but haven't been able to find out much about it on the Internet ... at least under that name... But I did find quite a lot about the "Atari Punk Console" which appears to have taken on an Internet life of … Continue reading 556 Timer Light Theremin →

Simple Synth IO Shield

I have a range of synthesizer chips and modules and some of those come on shields but I needed a way to hook up some potentiometers in a simple manner for testing and playing around. To date I've build separate modules (some examples here and here). One thing I often find is that music shields … Continue reading Simple Synth IO Shield →

Keyboard MIDI Matrix Decode

Following on from my Keyboard Matrix Decode I've now added MIDI out! So I have a full sized MIDI controller keyboard for the cost of a cheap Arduino Nano clone and a couple of passive components! https://youtu.be/kqcfxiKIzi4 Warning! I strongly recommend using an old or second hand keyboard for your MIDI experiments. I am not responsible for … Continue reading Keyboard MIDI Matrix Decode →

Keyboard Matrix Decode

I found an old keyboard, a "KSP970" which is a sub £20 keyboard with full size (non touch sensitive) keys, that was being thrown out as battery acid had corroded away most of the circuit board inside, but the keyboard itself was still intact so I thought it would make an interesting project to attempt … Continue reading Keyboard Matrix Decode →

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 →

MozziByte Output Board

I ordered myself a MozziByte board to make playing around with Mozzi a little simpler and it works really well. This details the updates to the Arduino PWM MIDI Synthesis with Mozzi project required to use the new board. These are the key Arduino tutorials for the main concepts used in this project: Mozzi Synthesis Library … Continue reading MozziByte Output Board →

Simple Passive Audio Mixer

I have a project coming up where I'm going to want to combine several audio outputs together. This would typically require the use of a mixer and a number of circuits are available to perform a nice mixing function. But I've gone for the cheapest, dirtiest solution possible that fits my requirements. It is just … Continue reading Simple Passive Audio Mixer →

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 →