Wire Connections

Use the white colored spool of wire to create a set of five wires that are approximately 4" inches (101mm) long.

Use the blue colored spool of wire to create four wires that are approximately 1" inch (25mm) long.

Cut a single blue wire to 4" inches (101mm) in length.

Use wire strippers to remove a bit of insulation from the tips of each wire then apply a bit of solder to tin them.

Install Key Switches 

Snap the five CHOC key switches into the 3D printed key plate oriented as shown here.

Ensure all of the keys are installed in the same orientation.

Install Key Sockets

Remove the protective cover from the cut tape reel of key sockets.

Insert the key sockets into CHOC key switches being very careful not to bend the pins.

Solder Wires to Sockets

Use the short blue wires to connect ground pins together on the switches.

Use the white wires to connect to the signal pins on the switches.

Solder Wires to QT Py

Connect the signal wires from the switches to the GPIO pins on the QT Py RP2040.

Solder the long blue wire to GND on the QT Py.

Install QT Py to Holder

Snap fit the QT Py into the 3D printed holder.

Secure QT Py Holder

Place the QT Py holder onto the 3D printed base with the mounting holes lined up.

Use two M3 x 6mm long machine screws to secure the QT Py holder to the 3D printed base.

Install Hinge Rest

Place the hinge rest into the designated spot in the 3D printed base with the three mounting holes lined up.

Use three M3 x 6mm long machine screws to secure the hinge rest to the base.

Install Key Dowel

Insert the dowel pin through the holes of the five keys.

Install Keyset

Place the dowel pin onto the hinge rest with each key fitting into their designated spaces.

Secure Key Plate

Orient the key plate and place it over the mounting tabs with the mounting holes lined up.

Insert and fasten two M3 x 6mm long machine screws to secure the key plate to the 3D printed base.

Install Keys

Press the five 3D printed keys to test the actuation of each CHOC key. Rearrange the wires if they are preventing the keys from being actuated properly.

Install Case Cover

Orient the cover with the base so the nubs line up with the mounting holes.

Firmly press the cover into the sides of the base so the nubs snap into the mounting holes.

Install Rubber Feet

Place the four rubber feet onto the corners on the bottom of the 3D printed base.

USB Connection

Plug in the USB cable into the QT Py and then into a USB port on a computer, laptop or mobile device.

You're ready to start typing!