DIY drum machine sequencer with samples

Introduction

Teensy / Arduino/ ESP32 based drum machine/ sequencer with high quality samples. Use MIDI to transfer data from sequencer to synth. / Groovebox.

The knobs:

Bpm
Play/ record
Free rhythm / on beat
Track number selection
Length: 8 / 16 beats
number showing current step
Drums; shown below.
Display? showing the situation

Arduino can play some audio samples at the same time, but the memory and clipping might be problems. ESP32 is more powerful. Teensy is very expensive.

The drums included (see https://en.wikipedia.org/wiki/List_of_percussion_instruments)

Bass Drum
Bongo Drum
Cajon Drum
Castanets
Conga Drums
Cowbell
Cymbals
Djembe Drum
Gongs
Hi-hat
Maracas
Snare Drum
Steelpan
Tambourine
Triangle
Woodblock

References:

DIY Arduino Drum Synth + FREE SAMPLES! https://www.youtube.com/watch?v=xo-iN3tfE6o

Simple, good starting point!
https://github.com/NickCulbertson/Arduino-Audio-Projects

https://www.instructables.com/MIDI-Drum-Machine/

ARDUINO 8 STEP KEYBOARD SEQUENCER FOR SYNTHESIZERS https://www.youtube.com/watch?v=9oGlCfwCoCw

https://www.lookmumnocomputer.com/projects/#/sequencer-keyboard
CV patch cables (also called mini-jack patch cables, modular patch cables or Eurorack cables)

Drum trigger sequencer. How To Make Your Own Drum Sequencer DIY The BIG BUTTON https://www.youtube.com/watch?v=6ArDGcUqiWM

https://diyelectromusic.com/2021/06/23/arduino-mozzi-sample-drum-sequencer/

Doof machine

https://github.com/gavD/arduino-drum-machine

Mozzi https://sensorium.github.io/Mozzi/gallery/

The Bastl Microgranny https://www.instructables.com/Microgranny-Sampler-Completely-Home-built-not-a-Ki/

SnapBeat https://www.hackster.io/hiro-akihabara/snapbeat-the-simple-lo-fi-sampler-5a3222

https://www.youtube.com/watch?v=U5Q8chfMglE

https://www.youtube.com/watch?v=YeKsXck8LDY

NI404 https://www.synthtopia.com/content/2024/01/21/the-ni404-is-an-open-source-diy-hardware-sampler-sequencer/