Prep LED Sequins


LED sequins come in a pack of five. Use flush diagonal cutters to them break away from the panel.

Cut close to the pads to avoid having to remove any perforations on the edges.


We'll need to connect wires to the LED sequin from the bottom of the PCB. You can tell which pad is positive and negative by looking at Tthe adafruit logo – It's right next to the postive+ pad.

Use third helping hands to secure the LED sequin. Then, tin the positive and negative pads with a bit of solder.

Measure and Tin Wires


Now we can measure the wires for the LED and the push button. For the push buttons we’ll measure from the battery walls in the center, to the opening on the side of the brick. The LED will connect from the center cut away to the top of the two middle walls.


Match up the wire lengths for the opposite side and cut them to size. Tin all of the wires so they won’t fray while soldering together. It’s also a good idea use silicone coated wires since we’ll need to flex the wires to fit inside the brick. Here we’re using 30 gauge silicone coated wire to fit between the wall gaps.  

Copper Tape


Now we can create the contacts for the coin cell by using pieces of copper foil tape. The tape has a sticky backing and we can solder wire directly to the tape.


Hold the pieces of copper foil tape with tweezers. Secure the tweezers to third helping hands to keep it sturdy while soldering. Tin one side of the piece of copper foil tape with a bit of solder. Then, solder the longer wires to the copper tape. Repeat this process for the second wire. 



The longer wires will connect to the push button. To fit our button inside the brick, we’ll first need to trim the two pins from the button short. Cut both pins using a pair of flush snips, just below where the they bend. Secure the button to third helping hands. Then, tin the two short pins with a bit of solder.


Next, we’ll connect the wires to the pins on the button. These should be positioned on the inner side of the pins at an up right angle. This way we can fit the button through the opening on the brick.

LED wires


Now we can solder the two shorter wires to the pads on the LED sequin. Secure the LED sequin to third helping hands. To diffuse the brick, we’ll need to position the LED face down. Then, solder the wires on the bottom of the PCB.

Copper Tape contacts


We’ll need two more pieces of copper foil tape for connecting the batteries to the LED sequin. Use scissors to cut thin slices of copper foil tape. Then, remove the backing and stick them to the inside of the brick.


You can use tweezers to stick the copper foil tape to the inner lining of the brick. Use the flat end of the tweezers to evenly stick them to the walls. Follow the photo to reference the correct position.


Next, tin the two pieces of copper foil tape with a bit of solder.

Mounting LEDs


Now we can insert the LED into the brick, face down. It should press fit into place with the wire facing upright.


Next, position the wires toward the two pieces of copper foil tape.


Hold the wire in place and carefully apply heat to solder each wire to the copper foil tape. Make sure your iron is clean so you can quickly solder the wires without melting the brick.

Mount Buttton


Now we can insert the push button into the brick with the wiring going through the opening first. Press the button in until it snaps into place.


The pins should be short enough to push up against the wall. If the button stick out too much, you’ll need to trim the pins until it fits.

Wedge Wires


Now we can wedge both wires between the gaps in the walls. Use the flat end of the tweezers to help tuck the wires inside.


Remove the backing from the copper tape and stick it the inner side of the walls.

Insert Batteries


Next, insert the batteries in the brick. Line up the positive and negative contacts with the copper foil tape so they have matching polarities.


If the batteries are loose, you can add an additional piece of copper tape to help keep the batteries from moving around. Press the push button to check if the LED powers on.


If it doesn’t power on, make sure the copper tape is making contact with the batteries.

Attach bottom


Now we can secure the bottom cover to the brick. Use an M2 (or a #2-56) machine screw to mount the two parts together.


Fasten the screw through the bottom cover to create threads in the mounting hole. Try to keep the machine screw straight while fastening. Then, position it over the brick and fasten the screw until both parts are tightly mounted together.


Completed Bricks

And now we have a super bright DIY lego light brick!! Add these to light light up props in scenes or even add it to characters to give them a cool looking glow. You can of course combine these with original light bricks to create different light combinations.

This guide was first published on Feb 21, 2017. It was last updated on Feb 21, 2017.

This page (Assembly) was last updated on Feb 19, 2017.

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