MiniMO Modular Synthesizer – Full DIY Kit

£4.50£12.00 (Excl. VAT)

Standalone micro modular synth – now with MIDI out expansion option! – This is not a Eurorack Kit

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The MiniMO is an 8-bit standalone modular synthesizer built around the ATtiny85 processor, a relative of the popular Arduino. All miniMOs are identical;  but you can load them with different programs according to the system you want to make with Arduino. If you have three modules, you can program them to be three oscillators, or two oscillators and a filter, or a sequencer, an oscillator and an envelope generator, or any other configuration that suits your fancy.

MiniMO takes power either from a single CR2032 cell battery or from an external source up to 5V; you can switch sources via a handy long jumper that doubles as an ON/OFF switch if you’re only using one. By default the processor runs at 8MHz, which is the recommended speed for battery powered operation, but it can be changed in software to run at 16MHz.

You can program a miniMO with an ISP programmer, or very easily using an Arduino. Your purchase includes a header that makes plugging miniMO to an Arduino a breeze, and once the miniMO is connected, you can use and reprogram it on the fly. To make the most of miniMO, we recommend having an Arduino UNO or similar, but the module comes with the processor already programmed so that you can start having fun right away!

The modules make the most of the ATtiny, including a potentiometer and push button as inputs, an LED for visual output, and four configurable ports:

Ports 1 and 2 are identical outputs with PWM
Port 3 is an analog input which (always) modulates the potentiometer
Port 4 is usually an analog input, but can also work as a digital output

MiniMO Specifications:

  • ATtiny85 processor with 8K flash, 512 bytes of SRAM and 512 bytes of EEPROM
  • Runs at 8MHz (configurable)
  • Powered with cell battery or an external source, from 3 up to 5V
  • Four configurable external I/O ports
  • Programmable via ISP, compatible with Arduino IDE
  • Size: 38x40x30.5 mm (assembled)
  • RoHS PCB and components
  • Mounting holes for legs or covers (or a keychain!)

The MinoMO is an open source project – MiniMO Github

More MiniMO demos can be found here:

MIDI Out Accessory Set

The accessory set includes:

  • A female MIDI adapter to connect miniMO to any device with a MIDI Input
  • A three-pronged jumper to power both miniMO and the MIDI adapter from the internal battery
  • A custom 3D-printed red enclosure with flexible outer cover
  • Two laminated faceplates: one generic, one with custom markings for the sequencer (shown in the picture)
  • A Davies-1900h clone knob with brass insert and set screw

The set has been specifically designed to complement the new MIDI sequencer program, making miniMO possibly the smallest MIDI sequencer available on the market; it also opens the door to a new set of MIDI-oriented programs, further expanding on the capabilities of the system. The accessory set does not include the core MiniMO kit which must be bought separately.

MIDI Sequencer Features:

  • Configurable MIDI channel
  • Configurable number of steps
  • Configurable scales
  • Real time Tempo control
  • Real time Transposition with configurable intervals
  • Real time Octave control with configurable number of octaves
  • Real time selection of forward or reverse playback
  • Step Edition Mode with real time note and length control
  • Random sequence generation on start up
  • Automatic Battery check

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