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Build Instructions, Page 6 / 6

Step 14: Case

Carefully peel the copper foil from the backing. One side is sticky. Put the sticky side down on the inside of the case. Plan out your button arrangement before putting any foil down! There is an up, down, left, and right button. Make sure not to cover the display!

When placing the buttons, make sure you don’t touch the sticky side. The adhesive holds the button to the case, and if the oil from your fingers gets on that side, the buttons won’t stick as well. Use your fingernail to press down on the edges of the button to ensure a good attachment.

Solder contains metal, and a substance called flux. The flux helps the metal flow, but it can “pop” and make things messy. Normally, we don’t care about the flux making a mess, or remove it with some rubbing alcohol. However, we don’t want drops of flux splattered over our case. Use a piece of paper as a shield to protect the case from stray flux splatters.

Protect the rest of the case with a piece of paperApply copper foil buttons inside the top of the clear case

Trim a little bit of the insulation from both ends of the stranded wire. Spread the strands of one end out over the center of the pad. Make sure the wires don’t go over any other pads than their own, and tape them down to the paper. We don’t want them moving when we’re soldering–it will make a weak connection and your buttons won’t work.

Normally, it is very bad to “drop” solder from the end of your iron to any components. However, this is a special circumstance. Hold your iron just a bit above the wires, and push solder onto the tip of the iron. Let the solder blob drop onto the pad. Spread the solder out as needed. The wires need to be solidly connected to the pads, but holding the iron to the copper pads for too long will start to melt the case!

Finished button padsDrop a blob of solder down on the button foil pads

Remove the paper backing from the sticky tape on the battery holder. Place the Nerdle PCB over the mounting holes and press the battery holder down next to the PCB.

Press the battery holder into place next to the PCBRemove paper backing from battery holder

Next, solder the other end of the wires to the board. The holes are labeled P3, P4, P5, P6. Be sure to follow the following scheme: P3 = left, P4 = right, P5 = up, P6 = down Screw the board into the back panel.

Screw the PCB into the caseSolder the other end of the button wires to the PCB

Put the batteries in. The build is complete!

Finished button padsDrop a blob of solder down on the button foil pads

Before you screw the top of the case in, it’s time to put some software on the Nerdle!

Finished Nerdle!