fabric coverthat will go onto the
3D printed cone of the lamp shade. To create the fabric cover, you will first laser cut the desired shape and then sew it together.
Adobe Illustratorfor the laser cut drawing. The lamp shade will be laser cut in the shape of a
half circlewith a
radius of 14cm. The easiest way to draw a half circle is to first
draw a full circlein Illustrator
(width/height: 28cm)and then
delete half of the circlewith the
'white mousepointer' tool, which allows you to select individual parts of the circle path. Finally, to close the half circle,
draw a straight linefrom one end to the other.
(line color: full red (R:255, G:0, B:0), and
line thickness: 0.0001mm).
export it as a .pdfand you are ready for laser cutting. We already cut out the
fabric patches in a size of 30cmx20cm, which will fit your drawing. Laser cut your half circle out of this patch (it does not matter which side of the fabric faces up in the laser cutter). When cutting, set the
speed to 100%and the
power to 35%.
fold your half circle fabricover in the middle. Before you fold it, look at the fabric. You will notice that it has a good looking side with the pattern well visible and a less good looking side. After folding, the
good looking side should be facing inwardsand the
not good looking side should be facing outwards(yes, this is correct). The reason we are doing this is that sewing is always done on the inside of the final object, so later on we will flip the fabric cover over and the good looking side will be visible outside.
sew together the straight edgeof the half circle that is
not yet connected. Take one of our
mobile sewing machinesand sew together the open straight line. To do this,
insert the fabric into the sewing machineand then draw the sewing machine in
one straight motionover the edge as shown below. You can start a little bit towards the inside to make the cone more tightly fit on the lamp shade. When you reach the
end of the edge, keep the sewing machine running for another 5-10 seconds. This will add a few more knots to the yarn which will ensure that the yarn does not open up directly when you pull on it accidentally. Carefully
disconnect the sewing machinewithout untanging the knots you just made.
glueto fix the yarn at the endpoint, so that the thread does not come apart when you handle the lamp shade in the next steps.
Wait for the glue to dry.
flip over your fabricso that the good looking side now faces outside. Place it onto your 3D printed lamp shade to see if it fits.
add the touch buttonsonto the lamp shade using
conductive yarn. We will add
4 touch buttonsto the fabric lamp shade. One of the touch buttons will later be used to
turn the lamp on and off, and the other three touch buttons will be used to set
3 different color schemesfor the lamp (e.g. Red, Green, and Blue).
needleand a roll of conductive yarn. Thread the conductive yarn into the needle. Make a
double knot at the end of the yarnto make sure that it will hold onto the fabric and doesn't go through it.
where you want to place them. In our example, we put the
three R, G, B light color buttons on one sideof the lamp and the
on/off button on the other sideof the lamp. You need to leave at least
2cm between adjacent touch buttonsotherwise there will be cross talk among the wires of the buttons.
cross patterninto the fabric. Below you see the cross stitch step-by-step. When you finished the cross-stitch of your touch button,
cut off the yarn(do not cut if off to short,
leave at least 5cm yarn).Use
glue to secure the endof the yarn in place. Then continue with the next touch button. Each touch button should use
its own yarn (i.e. wire). They should not be connected together with the same yarn since we otherwise would not be able to sense which button is touched. When you start the next touch button, make sure to
leave at least 2cm distanceto the previous touch button so there is no cross talk among the wires of the buttons.
jumper wire. Cut off a piece of
conductive copper tape. First, wrap the beginning of the copper tape around the jumper wire. Before closing off the tape, also include the conductive yarn so everything is
all 4 conductive yarnsconnected to our touch buttons. At the end of this step, you should have four jumper wires connected ready for breadboarding.
conductive yarns inside the lamp shade do not touch each other. You can ensure this by
glueing each jumper wire to one of the armsof the lamp shade to spread them out.
connect the LEDsto your lamp shade. For the LEDs, we will use
Neopixel LEDs, which are RGB LEDs that can be
addressed individuallyand thus each LED on the strip can take on any color you like.
large roll. As you can see in the image below, between each LED there are
3 copper pads. You need to
cut off a strip of 4 LEDswhile making sure you
cut the copper pads right in the middle at the end of your strip, so the next person still has enough copper pads on their LEDs to be able to solder on a wire.
silicone filmthat covers the LED strip. The silicone film is used to
protect the LED strip from waterand other environmental influences but
prevents us from solderingonto the copper pads. We only need to solder at the end of the LED strip, but which end should we use? Look at your LED strip. There are arrows on it. We want to
solderon the side where the
arrows point away from. Remove the silicone film from the top of the LED strip on this side.
wires that go from the LED copper padsto the microcontroller. Note that the Neopixel LED strip is setup so that you only have to connect to the copper pads of a single LED in order to be able to set the color of each individual LED on the entire strip (more on this in the next lab). Thus, you only need to
solder three jumper wiresto the end of the strip where you just removed the silicone. For soldering, first
put a solder drop on each padand then
press the tip of the jumper wire on the dropwith the solder iron.
Remove the blue foilfrom back of the LED stripes. Underneath the blue foil, there is
double sided tape on the back of the LED strip. With the double sided tape exposed, you can now attach the LEDs to one of the free arms inside the printed lamp shade (i.e., an arm that does not have a jumper wire connected to a touch button).