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Raspberry PI A+, B+ and 2B GPIO J8 40-pin pinout. Raspberry PI Models A and B have only the first 26 pins.
| GPIO# | 2nd func | pin# | pin# | 2nd func | GPIO# | |
|---|---|---|---|---|---|---|
| – | +3V3 | 1 | 2 | +5V | – | |
| GPIO2 | SDA1 (I2C) | 3 | 4 | +5V | – | |
| GPIO3 | SCL1 (I2C) | 5 | 6 | GND | – | |
| GPIO4 | GCLK | 7 | 8 | TXD0 (UART) | GPIO14 | |
| – | GND | 9 | 10 | RXD0 (UART) | GPIO15 | |
| GPIO17 | GEN0 | 11 | 12 | GEN1 | GPIO18 | |
| GPIO27 | GEN2 | 13 | 14 | GND | – | |
| GPIO22 | GEN3 | 15 | 16 | GEN4 | GPIO23 | |
| – | +3V3 | 17 | 18 | GEN5 | GPIO24 | |
| GPIO10 | MOSI (SPI) | 19 | 20 | GND | – | |
| GPIO9 | MISO (SPI) | 21 | 22 | GEN6 | GPIO25 | |
| GPIO11 | SCLK (SPI) | 23 | 24 | CE0_N (SPI) | GPIO8 | |
| – | GND | 25 | 26 | CE1_N (SPI) | GPIO7 | |
| (Models A and B stop here) | ||||||
| EEPROM | ID_SD | 27 | 28 | ID_SC | EEPROM | |
| GPIO5 | – | 29 | 30 | GND | – | |
| GPIO6 | – | 31 | 32 | – | GPIO12 | |
| GPIO13 | – | 33 | 34 | GND | – | |
| GPIO19 | – | 35 | 36 | – | GPIO16 | |
| GPIO26 | – | 37 | 38 | – | GPIO20 | |
| – | GND | 39 | 40 | – | GPIO21 | |
Model B rev 2 also has P6 which has 8 pins offering access to an additional 4 GPIO connections.
| Function | 2nd func | pin# | pin# | 2nd func | Function | |
|---|---|---|---|---|---|---|
| – | +5V | 1 | 2 | +3V3 | – | |
| GPIO28 | GPIO_GEN7 | 3 | 4 | GPIO_GEN8 | GPIO29 | |
| GPIO30 | GPIO_GEN9 | 5 | 6 | GPIO_GEN10 | GPIO31 | |
| – | GND | 7 | 8 | GND | – |
Models A and B provide GPIO access to the ACT status LED using GPIO 16. Models A+ and B+ provide GPIO access to the ACT status LED using GPIO 47, and the power status LED using GPIO 35.
