V2 devices

Instruments

glockenspiel-37

37 Chromatic Notes Acoustic Instrument

Notes are controlled by a trigger and a damper, it allows a piano-like velocity and tone duration cotrol; a MIDI Note-Off will cause the currently playing tone to be damped. One RGB LED per note visualizes the playing notes. It is built using five pulse devices and one control device.

Input voltage 6-24 V
Connectors power supply, V2 plug. V2 socket
Dimensions 120 × 23 × 14 cm
Weight 9 kg
glockenspiel-37, front view
glockenspiel-37, top view
glockenspiel-37, side view

kontra-2

2 String Double Bass Acoustic Instrument

It is built using two step devices and one control device.

Input voltage 24 V
Connectors power supply, V2 plug, V2 socket
Dimensions 60 x 191 × 52 cm
Weight 39 kg
kontra-2, front view
kontra-2, side view
kontra-2, back view
kontra-2, rail view
kontra-2, strings view
kontra-2, wheels view
kontra-2, driver view

Electronics

Building Blocks for Musical Devices

V2 devices are connected via a bi-directional full-duplex RS485 serial connection. The connectors are called V2 Plug and V2 Socket. Additional wires supply power to the devices and connect the microcontroller's USB port to a USB host.

V2 devices are daisy-chained, a child device's V2 Plug is connected to the parent device's V2 Socket. The V2 wire protocol carries the address of the device it talks to, the parent devices forward the messages.

V2 devices are configured with a web browser. The firmware is updated using the web interface.

axis

Orientation Sensor Controller

Intelligent 9-axis absolute orientation sensor, combining accelerometer, gyroscope, magnetometer.

Device power supply V2 plug
Connectors V2 plug, V2 socket
Dimensions 49 × 49 × 8 mm
Weight 20 g
axis, front view
axis, back view
axis, inside view
axis, side view

cable

Ribbon Cable with IDC Connectors

Wires 10
Pins 2 × 5
Pitch 1.27 mm
ribbon cable

connect

USB to V2 Socket Controller

Active controller to connect a USB host to a V2 socket. It converts MIDI signals to a full-duplex, bi-directional RS485 serial connection, which can be used over long distances.

With customized configuration, it can act as a standalone device which maps MIDI signals and drives devices like pad, pulse or express. The board is identical to dmx, running a different firmware.

Device power supply USB host power
Connectors USB-C, V2 socket
Dimensions 66 × 18 × 8 mm
Weight 13 g
connect, front view
connect, back view
connect, inside view
connect, side view

dmx

DMX Adapter

The ribbon cable plugs into connect which is configured as a USB MIDI to DMX bridge. The device is configured with a web browser. An Ableton Live device maps track automation to DMX values. The board is identical to connect, running a different firmware.

Device power supply USB host power
Connectors USB-C, IDC connector, XLR
Dimensions 66 × 18 × 8 mm
Weight 13 g
dmx, cable
dmx, front view
dmx, back view
dmx, inside view
dmx, side view

control

Device Controller

Active controller to connect a USB host to devices like pulse or control. It supplies power and can power and address an RGB LED strip.

A usb connector is used to connect it directly to a USB host. For longer distances, a connect device can be used to connect a USB host over a RS485 serial connection.

It is used for the glockenspiel-37 to connect five pulse devices and 37 LEDs as a MIDI instrument.

Device power supply 6-24 V
LED strip maximum current 2.5 A
Connectors power supply wire connectors, LED wire connectors, V2 plug, V2 socket
Dimensions 71 × 18 × 8 mm
Weight 31 g
control, front view
control, back view
control, inside view
control, side view

express

16 Channel Analog Expression Controller

Samples the connected potentiometers from expression pedals, controllers, knobs, and sends out MIDI Control Change values accordingly. The expression devices are connected with 2.5 mm TRS jacks.

Channels 16
Device power supply V2 plug
Connectors 2.5 mm TRS jacks, V2 plug, V2 socket
Dimensions 191 × 49 × 8 mm
Weight 78 g
express, front view
express, back view
express, inside view
express, side view

express-mini

2 Channel Analog Expression Controller

Samples the connected potentiometers from expression pedals, controllers, knobs, and sends out MIDI Control Change values accordingly. Alternative firmware supports Force-Sensitive-Resistors (FSR) acting as drums pads, similar to pad. The expression devices are connected with 2.5 mm TRS jacks.

Channels 2
Device power supply V2 plug
Connectors 2.5 mm TRS jacks, V2 plug, V2 socket
Dimensions 61 × 49 × 8 mm
Weight 26 g
express mini, front view
express mini, back view
express mini, inside view
express mini, side view

knob

Analog Expression Knob

Potentiometer with a 2.5 mm TRS jack. The ring supplies the reference voltage, the tip is connected to the potentiometer's wiper.

Resistance 10 kΩ
Connectors 2.5 mm TRS jack
Dimensions 49 × 49 × 26 mm
Weight 40 g
knob, front view
knob, back view
knob, side view
knobs

pad

Drum Pad with Velocity, Aftertouch, Light

Device power supply V2 plug
Connectors V2 plug, V2 socket
Dimensions 87 × 8 mm
Weight 55 g
pad, front view
pad, back view
pad, inside view
pad, side view

power

Power Supply and Debug Connector

Inserted into a V2 connection, it supplies the devices connected to its V2 socket with power. The power connection of V2 plug side will stay disconnected.

It provides USB access to the device connected to its V2 socket. It allows to debug the connected device, while the device still maintains the data connection to its V2 parent device.

Connectors USB-C, V2 plug, V2 socket
Dimensions 67 × 18 × 8 mm
Weight 12 g
power, front view
power, back view
power, inside view
power, side view

pulse

16 Channel PWM Solenoid Controller

Intelligent solenoid power controller, automatically adjusts to changes in supply voltage or different solenoid parameters.

It is driven by commands which specify the length in seconds and the power in watts of a solenoid trigger impulse. A typical value for a trigger of a glockenspiel-37 note is a 30 Milliseconds and a 2.5 Watt pulse. The controller calculates the PWM duty cycle using the measured solenoid resistance and the supplied voltage.

The controller constantly measures the supply voltage and solenoid resistance. Changes are visualized with the channel LEDs. To protect itself, it monitors the overall current it draws from the power supply and isolates channels which are short cut.

Channels 16
Input voltage 6-24 V
Maximum overall current 5 A
PWM frequency ~16 kHz
Device power supply V2 plug
Connectors power supply wire connectors, solenoid wire connectors, V2 plug, V2 socket
Dimensions 171 × 49 × 8 mm
Weight 72 g
pulse, front view
pulse, back view
pulse, inside view
pulse, side view
pulse with cables, front view
pulse with cables, back view
pulse with cables, inside view

range

Proximity Sensor

Proximity and ranging sensor. Detects an object in 10mm up to 3m distance in the field of view, and sends MIDI control messages accordingly.

Device power supply USB host power
Connectors V2 plug, V2 socket
Dimensions 49 × 49 × 8 mm
Weight 19 g
range, front view
range, back view
range, inside view
range, side view

serial

Serial MIDI Controller

Serial MIDI to V2 socket adapter.

Device power supply V2 plug
Connectors V2 plug, V2 socket
Dimensions 49 × 61 × 8 mm
Weight 25 g
serial, front view
serial, back view
serial, inside view
serial, side view

step

4 Channel Stepper Motor Controller

Intelligent stepper driver with acceleration ramp, absolute step movement, and motor rotation interface.

Channels 16
Input voltage 6-24 V
Device power supply V2 plug
Connectors power supply wire connectors, stepper motor wire connectors, V2 plug, V2 socket
Dimensions 49 × 147 × 8 mm
Weight 70 g
step, front view
step, back view
step, inside view
step, side view
step, side view
step, side view

usb

USB to Ribbon Cable Connector

Connects a USB host to a device's V2 plug. It supplies the host's power to the connected device. This adapter is used to update a device's firmware via USB.

The maximum length of the ribbon cable is limited by the USB signal and cannot exceed a few meters. To bridge long distances, a connect controller can be used which uses RS485 serial connections instead of USB.

Connectors USB-C, V2 socket
Dimensions 56 × 18 × 8 mm
Weight 10 g
usb, front view
usb, back view
usb, inside view
usb,side view

Software

Source Code and Firmware Updates

Downloads Source Code

Links

External links to related projects or useful ressources

Kay Sievers Videos Classical Music MIDI Files

Contact

Kay Sievers

kay@vrfy.org

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