DD Dev. Group DD Milli User Manual

DD Milli
User Guide

G18 - alpha

DD Dev. Group

2018.06

Product Overview

DDMilli is the second released product of DD series Keyboard. From the name you can see it is
DDMicro’s bigger brother, 60% size. It is sharing the mechanical layout with the most popular
60% PCB - GH60, with a lot more optional key positions. This means you can easily fit is in
most of GH60 cases and plates. And not like DDMicro, you can purchase the PCB individually.

The firmware is developed based on DDMicro, with a lot of new features.

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Bluetooth Low Energy 4.0 connection, supporting up to 8 paired devices, user can define
customised hot key to switch between devices, also support to define hot keys to reset/
add devices.

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USB Type C connection. You can connect the keyboard directly to your computer’s USB
Type C port.

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Lithium-ion battery connector onboard, also connected to a build-in charging circuit.

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Fully NKRO support(Max report keys are limited by USB protocol of 6).

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Standard Cherry MX switch footprint fit most of the switches in the market.

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Individual surface mounted RGB backlights, up to nine light effects, and configurable
color setting. Brightness and effects can be adjusted with customised hot keys.

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6 bottom RGB backlight mounting pads, with an extra RGB light strip port for extension,
support up to 60 SK6812 or equivalent light strip module.

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Up to 8 layers of fully configurable key mapping on all key positions. Support layer
switch/lock/reset with customised hot keys.

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Support most of GH60 layouts, with extra 0.25u shifted forth row and split space layout
on last row.

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Easy configuration tool with DDConf. The new version of DDConf can change the
configuration without rebooting the keyboard. You can update the key definition at any
time when USB cable is connected.

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Support mouse control and volume control hot keys.

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Out Looking

DDMilli’s layout is based on GH60. The top left corner has a USB Type C connector, that can be
connected to a USB 1.1/2.0/3.0/3.1 port. On the left of the USB connecter.

ATTENTION: do not connect DDMilli to USB Type C PD charger. Voltage over 5.0V might
cause damage on PCB hardware!

There is a red LED as charging indicator. It will lit up while it is charging, and turns off when
battery is full.

In the middle left, there is a power switch position. It is using 6pin footprint, and can be soldered
with self-lock switch, or standard SMT slide switch. It will turn on/off the battery connection. If
you don’t want to use a switch, please solder a short wire between the middle hole of two rows.
Then the battery will permanently connected.

The battery connector is right above the power switch, provided as a PH2.0 connector.

Please notice that the antenna is on the left side of PCB. The area close to the antenna should
not be completely covered with metal or carbon fibre material. Otherwise the signal quality will
be affected.

Because of more processors are used on board, DDMilli may not fit in some cases that has
critical PCB thickness requirement.

Reserved Keys

The first key on top row(‘Esc’ key in default definition) is Bluetooth Erase Band Key. Turn on
keyboard while holding this key can reset paired device list and re-enable Bluetooth advertising.

The second key on top row(‘q’ key in default definitions) is Bluetooth Add Band Key. Turn on
keyboard while holding this key can temporarily enable Bluetooth advertising for adding a new
device to paired list.

The forth key on top row(‘e’ key in default definitions) is Test Mode Key. Turn on keyboard while
holding this key can switch keyboard into test mode. This mode is used to detect any shortcut
happened on switches, and all RGB LED are working correctly.

The first key on second row(‘Tab’ key in default definitions) is Wakeup Key. If there is no
connection in Bluetooth mode for 3 minutes, the keyboard will switch to sleep mode to save
power. Then press this key can wakeup the keyboard again.

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Battery

DDMilli PCB supports to connect a Lithium-ion rechargeable battery. We recommend you to
select a battery with build-in safety protection IC. When assemble your keyboard, please pay
enough attention on battery protection from the switch pins. Don’t screw too tight with extra
pressure on the pins. Any packaging damage on battery is very dangerous.

When the battery voltage becomes too low, the keyboard will automatically switch off. Please
connect the USB cable to charge the battery. Don’t forget to turn on the power switch while
charging, otherwise the battery will not be connected to power. The keyboard is designed in
dual modes. Connecting USB cable to your computer, the keyboard can be used in USB mode
while charging.

A red LED indicator close to the USB port can show the charging status.It will turn on while
charging, and switch off after the battery is full.

Keys Layout

DDMilli supports may layout options, only some popular ones are listed below. Feel free
to switch them and create your own layout.

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