Clock Man - Eurorack Master Clock Module
This manual is based on a pre-series version of the module.
Clock Man is a module for Eurorack systems. Clock Man
provides two functions:
- it is a master clock generator for MIDI-Clock and DIN-Sync.
- it is an editor for the module Clock Boy
The software is published as open source under the creative
commons license "by-nc-sa 4.0"
For the Installation please use the ARDUINO IDE, see https://www.arduino.cc/en/software.
An introduction how to upload the program with the Arduino IDE can be
Clock Man - Users Manual
Firmware Version 0.5
Clock Boy Hardware Version 0.6
...for those, who think they don't need manuals:
Now more details for the patient ones...
- The function of the buttons and the data selector
|| Sends a MIDI Start Signal
Sets the DIN-Sync start/stop signal to high.
|| Sends a MIDI Stop Signal
Sets the DIN-Sync start/stop signal to low.
||Switches to edit value mode
|Selects the parameter page
| Data, pressed
|Not in use
||Sends a MIDI Start Signal
Switches the DIN-Sync start/stop signal to high.
||Sends a MIDI Stop Signal
Switches the DIN-Sync start/stop signal to low.
| Writes the selected value to the EEPROM
and returns to parameter select mode
| Data, turned
|Selects the value
| Data, pressed and turned
|Tempo: increase/decrease ten times
ClockBoy parameters: Sends the current value to ClockBoy
- Good Luck :-)
As first step you have to define by jumpers which power supply line is
Now you can connect the 16-pin header on the right side of the pcb with
the supply bus of your euro rack frame.
- Your eurorack does not provide +5V, so you use the +12V
- Your eurorack does provide a +5V line. Then set it like
Only connect the module to the power supply if the power switch of your
euro rack frame is switched OFF!
Pay attention to the alignment of the cable! The cable must be laid in
such a way that the red stripe points in the direction of the marking
at the pin header:
To enable the MIDI out on the 5-pin socket of the module you have to
set the two jumpers near the DIN socket:
If you connect a DIN-Sync device to the 5-pin socket, it might be
possible that the MIDI-signal on the socket troubles the DIN-sync
device. In this case remove those two jumpers. We tested with various
Roland® devices and with a Jomox® XBase09, and none of them had problems.
When you have finished those settings, mount the module[s] in your euro
Now you may switch the power of your euro rack frame on. The display
should show the name of the module and the software version.
After one second the display should switch to the tempo display
Connections with External Gear
Basically you will have a device which receives MIDI-Clock or DIN-Sync.
We call this the MIDI-"Slave".
connections between the ClockMan and the Slave depend on the
functions which the slave requires. Details will follow below.
Establish the following connections:
<-> Slave MIDI-In.
ClockMan 5-Pin-Out <-> Slave
Be sure to enable the clock input at the "Slave" device. On Roland®
gear usually a switch on the rearpanel had to be set to "input".
If you want to connect the ClockMan with any other of our devices like
MIDI-ITO, ClockBoy or VMC, then please read the last chapter of this
Connections with modules of the VMC System
ClockMan can communicate with other modules of the VMC system via the
VMC bus. Two connection types are available for this purpose:
- The ClockMan can send the clock signal and/or the start/stop
signal of the DIN sync output on line 1 or 2 of the VMC bus. For this
purpose jumpers have to be set on the pin header pairs above the VMC
- In addition, the ClockMan can send the MIDI clock signal to the
MIDI lines of the VMC bus and receive MIDI messages on one of the three
MIDI input lines. ATTENTION: Because the potential receivers of the
MIDI clock messages expect the MIDI clock on their input, the MIDI out
of the ClockMan must be connected to a MIDI in(!) line of the VMC bus.
PLease obey the setting in the following picture: one side of the
jumper cable sits on any of the three "Out" pins closer to the Arduino, The other end of the jumper cable sits on the one "In" pin labeled with the number of the bus you want the clock send to (in the example the clock is sent to bus #2).
The basic setup is done now.
Controls and Connectors
Operation ModesThe ClockMan
generates signals for clock, start, or stop at any mode. You may hit
START or STOP at any time no matter whether you edit a parameter or not.
MIDI clock and the signal on the clock pin of the DIN-Sync is generated
continously as soon as the modul is powered up. The right LED will
blink at quarter beats.
Pressing the START button sends a MIDI start command and sets the
start/stop pin of the DIN-Sync to high (= +5V). Pressing the STOP
button sends a MIDI stop command and sets the start/stop pin of the
DIN-Sync to low (= 0V). The left LED will be lit when the DIN
start/stop pin is high or a MIDI-start has been sent respectively.
Beside that the ClockMan has two modes of operation:
- In the "Parameter Select Mode"
the selection the
various parameters that shall be edited is done,
- In the "Value Edit Mode"
the actually selected parameter is set to a dedicated value and written
in the internal memory. Parameters that affect the ClockBoy are not
stored in the ClockMan (but in the ClockBoy)
Parameter Selection and Editing Parameter Values
NOTE: most of the parameters do NOT affect the ClockMan itself, but
only a ClockBoy (if connected with the ClockMan). In software version
0.6 only the parameters "Tempo", "Channel" (and "MIDI Thru" beginning with V0.7) affect the ClockMan!
After powering up ClockMan shows the parameter "Tempo". The
upper line of the display shows the parameter name, the lower line of
the display shows the value.
the endless DATA dial to switch to other parameters:
To change the value of a parameter press ENTER. The lower line of the
display will have now square brackets. Use the DATA dial to select
only selects(!) the value. The parameter still is at the old value. To
accept the selected value, either push the knob of the DATA dial or
press the ENTER button. Pushing the DATA dial remains in the value edit mode. Pressing the ENTER button returns to the parameter select mode.
Editing the "Tempo" works a little differently. To set another tempo choose in parameter select mode
the "Tempo" page (who would have guessed...). Then press ENTER. The
beats per minutes value is displayed in square brackets. When you turn
the DATA dial the displayed value will change by one. If you press the
DATA dial knob while turning the dial, the displayed value will change
by ten. In both cases the clock generator will remain at the old
tempo. If you now press ENTER, the clock generator immediately
changes its tempo and you exit Value Edit Mode.
however, you don't want such a hard tempo change. You can achieve a
smooth transition by holding down the the ENTER button, while turning
the DATA dial. The change-by-ten trick also works with the ENTER button
held down. As soon as you release the ENTER button you exit the Value Edit Mode with the smoothly set tempo
List of the available Parameters:
- "TEMPO": select the speed of the generated clock signal
- "DIVIDER": -> ClockBoy parameter (*)
- "SHUFFLE": -> ClockBoy parameter (*)
- "RST-MODE": -> ClockBoy parameter (*)
- "BEAT-1": -> ClockBoy parameter (*)
- "DIN/MIDI": -> ClockBoy parameter (*)
- "CLK-GATE": -> ClockBoy parameter (*)
- "CHANNEL": enables sending commands to the ClockBoy, selects the MIDI-Channel for this.
determines the MIDI Thru handling if the ClockMan reads a MIDI-In
signal via the VMC-bus. (implemented not before v0.7)
Now the detailled desciption of the ClockMans parameters.
(*) For the parameters affecting the ClockBoy please see the corresponding manual.
|20 - 250
the DATA dial while holding down the dial knob changes the value in
steps of ten. This function is disabled for values above 240 and below
30. Example: You can go from 53, 43, 33 down to 23 in steps of
ten, but then you must release the dial and set the remaining values in
steps of one.
ClockMan will NOT send MIDI control change data for the ClockBoy. This
will be necessary if one of your "slave"-devices reacts on MIDI CC
between #70 and #76
|1 - 16
|This has two functions:
Please keep in mind that these control
data may affect other devices in the "slave"-devices MIDI chain.
- It determines on which MIDI channel the control change data for the ClockBoy will be sent.
sends the selected channel number as value on MIDI CC 76 on all(!) 16
channels. A connected ClockBoy will react on this information only if
set to a dedicated "Channel Select Mode". See the manual of
ClockBoy for further details.
MIDITHRUnot available in Version 0.6
||Incoming MIDI-Data are not forwarded to the Output
|Incoming MIDI-Data are forwarded to the Output.
This includes incoming MIDI clock or start / stop commands too! Be sure
that the MIDI device from which the ClockMan receives the MIDI data
does NOT send MIDI-Clock!!!
All product names and brand names beside “ClockBoy”, "ClockMan",
“fanwander” belong to the corresponding owners. They are mentioned only
for educational purposes.
All rights reserved, by Florian Anwander 2022 - 2023
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