Connect STEMMA QT to OLED
Plug in the Stemma QT cable to the right port on the 1.3in OLED.
Place the 1.3in OLED onto the 3D printed cover with the mounting tabs lined up.
Double check the OLED is in the correct orientation.
Peel off the screen cover if it's still there.
Secure OLED to Cover
Get four M2.5 x 6mm steel machine screws. Insert the 3D printed washers to each of the screws.
Insert and fasten the four M2.5 steel machine screws to the 3D printed cover. Be careful not to over tighten them.
Double check the 1.3in OLED has been properly secured to the 3D printed cover.
Secure Pots to Cover
Start by positioning the three potentiometers with the 3D printed cover taking note of the order starting with potentiometer A on the left, B then C on the far right.
Insert each pot into their respected mounting holes on the 3D printed cover, taking note the order is reversed from the other side.
Insert and fasten the washers to secure each potentiometer to the cover. Use a socket driver or pair of pliers to securely tighten the washers.
Install Knobs
Start by rotating the shaft of each potentiometer so they're positioned all the way to the far left.
Make sure the set screw on each knob is loose enough to allow it to seat onto the shaft of the potentiometer.
Place the three knobs onto the shaft of each potentiometer with the marking matching the position in the photo.
Use the proper sized hex screw driver bit to fasten and secure the knobs to the potentiometers.
Install Rotary Encoder to Cover
Insert the rotary encoder into the respective mounting hole on the 3D printed cover.
Insert and fasten the washer onto the shaft of the rotary encoder. Use a pair of pliers to tighten and secure the rotary encoder to the cover.
Install Knob to Rotary Encoder
Get the 3D printed knob and orient it with the shaft of the rotary encoder.
Firmly press the knob onto the shaft of the rotary encoder. It should be able to press to click the built-in button switch.
Install KB2040 to PCB Mount
Orient the KB2040 with the 3D printed PCB mount.
Insert the KB2040 into the mount with the edge of the PCB fitted under the corner clips. Slightly bend the PCB mount to fit the other side of the PCB so it fits under the clips.
Double check the KB2040 is properly secured to the 3D printed PCB mount.
Secure PCB mount to Base
Place the PCB mount with the KB2040 onto the base with the mounting tabs line up with the two mounting holes.
Insert and fasten two M3 x 6mm long machine screws.
Use two M3 hex nuts to secure the parts together.
Double check the PCB mount is properly secured to the 3D printed enclosure base.
Install Hinge Rest
Place the 3D printed hinge rest onto the dedicated spot on the enclosure base. The part is symmetrical so the orientation isn't critical and the mounting holes line up properly.
Insert and fasten three M3 x 6mm long screws to secure the hinge rest to the enclosure base.
Prep Keys
Grab the five keys and the dowel. Insert the dowel through the bores that are built into the keys. The dowel should freely slide into each key.
Install Keys to Hinge Rest
Place the set of keys onto the hinge rest with each key fitting into the segmented cavities. Space out the 3D printed keys so they seat into their respective spots.
Press the set keys down so the dowel is fully seated into the channel in the hinge rest.
Install Key Plate to Base
Place the key plate onto the tabs built into the base with the mounting holes lined up and in the correct orientation.
Insert and fasten two M3 x 6mm long screws to secure the key plate to the base.
Test Keys
Take a moment to press down on each 3D printed key. Each key should be able to hinge and actuate the CHOC key switches.
Install Cover
Begin to fit the 3D printed cover onto the base enclosure. Place the cover over the key plate and make sure all of the wires stay inside the enclosure.
Firmly press the cover onto the base with the nubs on the base fitting into the mounting points on the cover. They should click into plate.
Double check any wires are not outside of the cover and base.
Test Knobs and Keys
Take a moment to press all keys and turn all knobs.
The three potentiometers should freely rotary.
The rotary encoder should be able to press down to click and freely rotate.
The five keys should be able to be pressed and actuate the CHOC switches.
USB Connect
Plug in a USB-C cable to the KB2040 on the side of the enclosure. Connect the other end of the cable to a computer or mobile device.
Page last edited August 13, 2025
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