To trigger keypress, short together pins D5 and B2 (marked on the PCB as 20 and 19).
When setting matrix pins, you need to use the MCU definitions instead of what is printed on the PCB. Sourced from https://www.pjrc.com/teensy/schematic_lc.gif. The following table can be used to convert between the two.
| PCB | MCU | Notes |
|---|---|---|
| 0 | B16 | |
| 1 | B17 | |
| 2 | D0 | |
| 3 | A1 | |
| 4 | A2 | |
| 5 | D7 | |
| 6 | D4 | |
| 7 | D2 | |
| 8 | D3 | |
| 9 | C3 | |
| 10 | C4 | |
| 11 | C6 | |
| 12 | C7 | |
| 13/LED | C5 | |
| 14/A0 | D1 | |
| 15/A1 | C0 | |
| 16/A2 | B0 | |
| 17/A3 | B1 | |
| 18/A4 | B3 | |
| 19/A5 | B2 | |
| 20/A6 | D5 | |
| 21/A7 | D6 | |
| 22/A8 | C1 | |
| 23/A9 | C2 | |
| 24/A10 | E20 | |
| 25/A11 | E21 | |
| 26/A12 | E30 |
