Front Panel Assembly Sheet Rev 1

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Fp01 pwb front rear.png

Parts List / Assembly Order[edit]

Qty Value RefDes Qty Value RefDes
4 10K, 0805 (Rear) R33, R36-R38 32 LED, 5mm (NOTE 3) (Front) DS0-DS31
32 1K, 0805 (NOTE 1) (Rear) R1-R32 1 HEADER, RT ANG, 1x2 (Rear) J1
3 2.2K, 0805 (NOTE 2) (Rear) R34-R36 1 HEADER, RT ANG, 1x5 (Rear) J2
32 SW, Pushbutton, 6mm (Note 4) (Front) SW0-SW31 1 HEADER, RT ANG, 1X4 (Rear) J3
4 MCP23017-E/SS (Front) U1-U4 1 HEADER, RT ANG, 2X2 (Rear) J4


  • Note 1 - 1K ballast LED resistors. Pick value for how bright you want LEDs at your operating voltage.
  • Note 2 - R34 and R35 are 2.2K I2C terminators. Needed for 3.3V operation and 400 KHz operation. R36 is INT* pullup.
  • Note 3 - LEDs - I like diffused Orange LEDs. I don't like clear LEDs.
  • Note 4 - Pick the height you like. I like 6mm high. You might like taller if you use keycaps.