Header Connections

The I2S Amplifier BFF board connects to the QT Py via short header pins and short header sockets on the QT Py.

The header pins are soldered to the I2S Amplifier BFF, under the speaker port. 

The short socket headers are soldered to the QT Py, under the USB C port.

Speaker Wires

Solder Pico Plug wires to the speaker.

+ connects to the red wire

 - connects to the black wire

Cut Matrix Pad Jumper to the second display

Use a hobby knife or flush cutters to carefully cut the trace on the 0x30 pad jumper.

Add solder to join the 0x31 pad as seen here.

Connect Matrix display

Use 50mm STEMMA cable to connect the two matrix displays.

Use a 100mm STEMMA cable on the left display (connects to the QTPy) .

Use a 200mm or longer, STEMMA cable on the right display (connects to the rotary encoder board).

Mount grid cover

Place the grid part into the inside the "front dome" part. The grid press fits into the display cut out.

Mount Matrix displays

Use M2.5x5mm screws to mount the matrix displays to the standoffs inside the front dome part.

Connect cables to QTPy and Audio BFF

Attach the STEMMA cables to the QT Py and the speaker wire to the Audio BFF boards.

Board Mount

Align the QT Py board to the mount with the USB port facing the two mounting tabs.

Press fit the QT Py to mount

The QT Py mounts to the holder part with the Audio BFF facing down.

Add M3x5mm screws to the two mounting tabs on the holder.

Rotary knob

Remove the hex nut and washer to fit the rotary knob into the back dome part. 

Plug the STEMMA cable to the port and mount the rotary board to the back dome, with the port to one side as shown.

Use M2.5 screws to mount the rotary board to the standoffs inside the dome part.

Mount speaker

Place the speaker into the back dome cut out part with the wire contacts facing out.

Once the speaker is placed, rotate until the contacts face towards the back of the dome part.

Snap fit domes

Align the speaker cutout on the front dome to the back dome and firmly press fit together to attach both halves of the dome parts.   

Attach rotary knob tail

Align the D shape on the steam to the cutout on the printed tail knob.

Press fit the tail part to the stem to fit.