Sweet Sixteen - build guide & manual

Build it!

To build the Sweet Sixteen you need:

The partial kit (PCBA with all SMD components populated and 16 faders)
32 mono and 2 stereo thonkiconn jacks
All components listed in the BOM or the Mouser cart (Teensy 3.2, slide switches, bi-color leds, headers...)

IMPORTANT: Leds must be soldered reversed (anode to GRND and cathode to V+) in order to get green light for positive voltages and red for negative ones!

Solder 2 rows of pin headers to the Teensy and also the SMD header to the + - pads, those 2 pins must be aligned with the second pin of the lateral rows.

Cut the pins of the female headers for the Teensy (ideally to 1,6mm)

Solder all the pin headers except the eurorack power one (that way you'll have more room to solder the faders and leds) and put some insulating tape to avoid shorts with the faders.

Next solder the faders, take care to not apply too much heat (max 340º during 3 seconds). Once the headers are done place the rest of the components and the panel, make every led is in it's hole before soldering,

The aux pcb allows to switch on/off the i2C pull-up by swapping 2 jumpers. The jumpers in this image are making the pull-up ON.

In this position the pull-up is OFF.

Don't tight the metal screws at all or the faders won't go down at all. If you got the nylon ones is ok, they're smaller

Set the +5V source to power the Teensy with this jumper:

REG - onboard LDO regulator
PSU - the 5v rail of your rack

Use JP1 jumpers to swap the midi trs pinout as follows:

K - Korg / Makenoise
A - Arturia / Novation

JP3 is an i2C port, just in case you want to have it as a permanent connection.

Do not hot plug the i2C trs jack, and never plug there a CV source unless you'd like to destroy the Teensy board.

Firmware

There's a new 16n firmware from Tom Armitage (fully compatible with the Sweet Sixteen) in this new version the midi controllers & channels can be configured via a web application without reinstalling the firmware , learn more about it here

Download the source code here.

You can flash the Teensy using the panel USB (with the module powered) or the Teensy's micro USB (with the module off).

To modify the midi CC and channel assigned to every fader you need the source code and install Teensyduino, but no coding skills are necessary. Just change those values in the 'config.h' tab,

In the Teensyduino 'Tools' menu make this settings and press 'upload' (the top left arrow).

Sweet Sixteen integration with ER-301

thanks to Bandon Logic

To make the Sweet Sixteen work with the ER-301 you need to activate the 'i2C pull-up' in the Sweet Sixteen and uncomment those flags in the 'config.h' tab of the firmware:

#define MASTER 1 (for 16n firmware 2.0 this it's done in the web config app)
#define bootDelay 10000

For the hardware connection use a 3 female-female jumper wire for the internal i2C port (GND-SCL-SDA):

First determine your ER-301 board revision.
If you have an ER-301 with board revision 7 (i.e. ER-301 manufactured before June 2018), then please go here.
Otherwise go here.

Enter the modulation screen for the parameter you want to control with the Sweet Sixteen (VCA unit in this example).

Click under 'Insert a unit here.'

Select the 'SC.CV' unit at the bottom of the list.

Set the port number, which represents which fader you would like to control this unit.

Turn the gain up for this control.

Jump back out the the UNIT and turn up the gain for the modulation there as well.

You should now be controlling that parameter with the Sweet Sixteen!

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