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Expansion header pinout
| Signal | Pin Nr. | Pin Nr. | Signal |
|---|---|---|---|
| 3.3 V | 1 | 2 | 5 V |
| Jetson I2C SDA, SMARC I2C SDA, SMARC GPIO 1 | 3 | 4 | 5 V |
| Jetson I2C SCL, SMARC I2C SCL, SMARC GPIO 0 | 5 | 6 | GND |
| SMARC GPIO 2 | 7 | 8 | |
| GND | 9 | 10 | |
| Jetson UART RTS, SMARC UART RTS, SMARC GPIO 3 | 11 | 12 | |
| SMARC GPIO 4 | 13 | 14 | GND |
| SMARC GPIO 8 | 15 | 16 | Jetson GPIO 3 |
| 3.3 V | 17 | 18 | Jetson GPIO 5 |
| Jetson SPI MOSI, SMARC SPI MOSI | 19 | 20 | GND |
| Jetson SPI MISO, SMARC SPI MISO | 21 | 22 | Jetson GPIO 6 |
| Jetson SPI SCK, SMARC SPI SCK | 23 | 24 | |
| GND | 25 | 26 | |
| SMARC GPIO 9 | 27 | 28 | Jetson GPIO 11 |
| SMARC GPIO 10 | 29 | 30 | GND |
| SMARC GPIO 11 | 31 | 32 | Jetson GPIO 13 |
| SMARC GPIO 12 | 33 | 34 | GND |
| Jetson I2S FS, SMARC I2S FS | 35 | 36 | |
| SMARC GPIO 13 | 37 | 38 | |
| GND | 39 | 40 |