An Arduino project for syncing the JamMan Solo XT looper pedal (and compatible ones) to any analog clock/pulse input, for example from Korg Volca units, Arturia sequencers and synthesizers, Eurorack signals, etc.
- Syncs JamMan looper pedals to Eurorack-like clock signals.
- Main LED lights up when clock input is present.
- Two additional LEDs blink following tempo (quarters and measures).
- The main LED blinks fast when incoming tempo is incompatible with JamMan (too fast or too slow).
- Optional switch for selecting pulses-per-quarter (disabled by default).
- Optional BPM display using a LTC-2727G (disabled by default).
Parameters and pins configuration can be changed using the constants at the beginning of the code. Each one is commented.
To detect clock pulses with the highest reliability possible, Arduino's interrupts are used. The input signal is taken from an Eurorack-like clock output using a mono 3.5" jack, with the tip connected directly into the Arduino's interrupt pin and ground to GND. The output is a MIDI-like signal on a stereo jack into the JamMan sync input, connected this way:
- TX out (pin 1) -> 220ohm -> jack tip
- 3.3V -> 220ohm -> jack ring
- GND -> jack ground
The rest of the circuit is basic, just the usual resistors on LEDs pins and an on/off switch directly connected to the Arduino power source.
If the optional pulses-per-quarter switch is enabled, it must be connected to an analog pin in a way that it feeds 0V or 5V depending on the switch position. If the BPM display is enabled, check the LTC-2727G datasheet or adapt the code to a 3+ digits 7-segments display of choice.
