This diagram shows the connections to be made:

The LiPoly backpack sits atop the Pro Trinket on the BUS, G and BAT+ pins, and the power jumpers are modified to connect a switch. This makes for a compact USB-rechargeable design

The vibration sensor switch connects to Pro Trinket pins 3 and 4. We use this to turn on when the necklace is 'tapped'

The remaining connections are:

However, the Pro Trinket and display are installed back to back, so the routing won't exactly follow the diagram above…one’s rotated 90 degrees with respect to the other. Also, much shorter wire lengths can be used! Here’s the process…

Lilon / LiPoly Backpack

Prepare the circuit to work with an on-off slide switch by carefully cutting the trace between the two 0.1" holes with a box around them (the battery output line)

Add the On/Off Switch

Once that trace is cut, you can solder two wires from the power-switch pads to a switch (like a slide switch, or a pushbutton one, for example)

Measure wires

Align the Pro Trinket up with the display and appropriately cut each wire so that it can reach each through-hole.

LiPoly backpack headers

Solder the included headers onto the LiPoly backpack.

Display power

Connect the VIN pin on the display to Bat pin on the LiPoly backpack and solder the LiPoly header pins into the Pro Trinket.

Sandwich Pro Trinket

Use two third-helping hands and tweezers to align each wire and through-hole.

Solder display and Pro Trinket

Follow the circuit diagram and double check each connection before soldering. 

Vibration sensor

Insert the vibration sensor into pins 3 and 4. Use flat pliers to grab the ends and bend it over the Pro Trinket. Make sure to avoid covering the reset button.

Fit circuit into enclosure

Insert the completed circuit into the printed case at an angle, port side first.

Install Slide Switch

Use tweezers to mount the slide switch into the two clips.

Mount display

Secure the display to the enclosure with two #4-40x 3/8 flat Philips machine screws.

Back Cover

Add one #4-40 x 3/8 flat Philips machine screw into the chamfered hole on the cloudCover.stl part.

Add buttons

Paint or print each button in a sperate color and glue them on the the front of the cloudCase.stl part.

Make it Wearable

Add a split ring to the top loop of the cover and link it to your favorite necklace.

Wear It

Put it on and show it to your friends! Now you can take your love for 8-bit retroness with you everywhere!