| Header J1 | ||||||
|---|---|---|---|---|---|---|
| Pin | Signal | Description | Pin | Signal | Description | |
| 1 | COL4 | Column 4 | 7 | ROW4 | Row 4 | |
| 2 | COL3 | Column 3 | 8 | ROW3 | Row 3 | |
| 3 | COL2 | Column 2 | 9 | ROW2 | Row 2 | |
| 4 | COL1 | Column 1 | 10 | ROW1 | Row 1 | |
| 5 | GND | Power Supply Ground | 11 | GND | Power Supply Ground | |
| 6 | VCC | Power Supply (3.3V/5V) | 12 | VCC | Power Supply (3.3V/5V) | |