Solder all the buttons and LEDs.
- Tactile switch * 19
- 220 resistor * 19
- Natural key LED * 11
- Accidental key LED * 8
Double check to make sure you've got the correct LED colors before soldering!
- Solder the 19 tactile switches into S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, and S20. Make sure they're perfectly flat against the PCB, just like S1!
- Solder 19 220 resistors to R5, R9, R13, R17, R21, R25, R29, R33, R37, R41, R45, R49, R53, R57, R61, R65, R69, R73, and R77.
- Solder the remaining 11 LEDs for the natural keys to D3, D5, D7, D8, D10, D12, D13, D15, D17, D19, D20.
- Solder the 8 LEDs for the accidental keys to D2, D4, D6, D9, D11, D14, D16, and D18.
The components' brands and PCB/LED colors may look different from yours, and that's okay! What's important is that the part types and values are in the right spots.
With the battery attached and power switch on, press buttons S2 through S20. You should see each of its corresponding LEDs light up, just like S1!
- Do all the usual debugging steps like checking solder joints, etc.
- Do the same troubleshooting checks you did in Step 2: Timer LED Power for all the buttons and LEDs.