General Purpose Input Output (GPIO)
Resources:
- eLinux.org RPi Low-level peripherals
Notes:
- GPIO pins are 3.3 volt logic levels and are not tolerant of 5V levels
- GPIO properties can be set as a block (GPIO pins 0-27 are in the same block) not per pin.
- Can interrupt based on high/low/rise/fall/change.
- Input hysteresis (Schmitt trigger) can be on or off,
- Output slew rate can be fast or limited, and
- Source and sink currents are configurable from 2 mA up to 16 mA.
Color Legend
| Color Legend |
|---|
| 3.3 VDC Power | Serial Console/Power |
| 5 VDC Power | HX711 Scale |
| Ground | I2C Sensors |
| Unused | I2S Audio |
The first 26 pins on J8 (A+ and B+ models) are the same as H1 on the A and B models.
| Hivetool |
|---|
| Reserved for I2C Sensors |
| Reserved for I2C Sensors |
| Reserved for I2C Sensors |
| Unused |
| Reserved for I2C Sensors |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Reserved I2S |
| Unused |
| Unused |
|
| R Pi |
|---|
| 3.3 VDC Power |
| GPIO 2 I2C |
| GPIO 3 I2C |
| GPIO 4 |
| Ground |
| GPIO 17 |
| GPIO 27 |
| GPIO 22 |
| 3.3 VDC Power |
| GPIO 10 SPI MOSI |
| GPIO 9 SPI MISO |
| GPIO 11 SPI SCLK |
| Ground |
| I2C EEPROM ID_SD |
| GPIO 5 |
| GPIO 6 |
| GPIO 13 |
| GPIO 19 PCM_FS |
| GPIO 26 |
| Ground |
|
| J8 |
|---|
| 1 | 2 |
| 3 | 4 |
| 5 | 6 |
| 7 | 8 |
| 9 | 10 |
| 11 | 12 |
| 13 | 14 |
| 15 | 16 |
| 17 | 18 |
| 19 | 20 |
| 21 | 22 |
| 23 | 24 |
| 25 | 26 |
| 27 | 28 |
| 29 | 30 |
| 31 | 32 |
| 33 | 34 |
| 35 | 36 |
| 37 | 38 |
| 39 | 40 |
|
| R Pi |
|---|
| 5 VDC Power |
| 5 VDC Power |
| Ground |
| GPIO 14 TXDO |
| GPIO 15 RXDO |
| GPIO 18 PCM_CLK |
| Ground |
| GPIO 23 |
| GPIO 24 |
| Ground |
| GPIO 25 |
| GPIO 8 SPI_CE0 |
| GPIO 7 SPI_CE1 |
| I2C EEPROM ID_SC |
| Ground |
| GPIO 12 PWM |
| Ground |
| GPIO 16 |
| GPIO 20 PCM_DIN |
| GPIO 21 PCM DOUT |
|
| Hivetool |
|---|
| Reserved Power HX711 |
| Reserved Power |
| Reserved Ground |
| Reserved serial console |
| Reserved serial console |
| Reserved I2S |
| Unused |
| Reserved HX711 |
| Reserved HX711 |
| Reserved HX711 |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Unused |
| Reserved I2S |
| Reserved I2S |
|
H5 is only on the A and B models. GPIO 28-31 are not available on the + models. These signals should probably not be used.
| Hivetool |
|---|
| Unused |
| Unused |
| Unused |
| Unused |
|
| R Pi |
|---|
| 5 VDC Power |
| GPIO 28 |
| GPIO 30 |
| Ground |
|
|
| R Pi |
|---|
| 3.3 VDC Power |
| GPIO 29 |
| GPIO 31 |
| Ground |
|
| Hivetool |
|---|
| Unused |
| Unused |
| Unused |
| Unused |
|
GPIO ordered by Signal Name
| Signal | Alt Function | J8 | H1 | H5 |
|---|
| 3.3 VDC Power | | 1 | 1 | 3 |
| 3.3 VDC Power | | 17 | 17 | |
| 5 VDC Power | | 2 | 2 | 1 |
| 5 VDC Power | | 4 | 4 | |
| GPIO 2 | I2C | 3 | 3 | |
| GPIO 3 | I2C | 5 | 5 | |
| GPIO 4 | | 7 | 7 | |
| GPIO 5 | | 29 | | |
| GPIO 6 | | 31 | | |
| GPIO 7 | SPIO CE1 | 26 | 26 | |
| GPIO 8 | SPIO CE0 | 24 | 24 | |
| GPIO 9 | SPIO MISO | 21 | 21 | |
| GPIO 10 | SPIO MOSI | 19 | 19 | |
| GPIO 11 | SPIO SCLK | 23 | 23 | |
| GPIO 12 | PWM | 32 | | |
| GPIO 13 | | 33 | | |
| GPIO 14 | TXD | 8 | 8 | |
| GPIO 15 | RXD | 10 | 10 | |
| GPIO 16 | | 36 | | |
| GPIO 17 | | 11 | 11 | |
| GPIO 18 | PCM_CLK | 12 | 12 | |
| GPIO 19 | PCM_FS | 35 | | |
| GPIO 20 | PCM_DIN | 38 | | |
| GPIO 21 | PCM DOUT | 40 | | |
| GPIO 22 | | 15 | 15 | |
| GPIO 23 | | 16 | 16 | |
| GPIO 24 | | 18 | 18 | |
| GPIO 25 | | 22 | 22 | |
| GPIO 26 | | 37 | | |
| GPIO 27 | | 13 | 13 | |
| GPIO 28 | I2C0_SDA | | | 3 |
| GPIO 29 | I2C0_SCL | | | 4 |
| GPIO 30 | | | | 5 |
| GPIO 31 | | | | 6 |
| I2C EEPROM ID_SD | | 27 | | |
| I2C EEPROM ID_SC | | 28 | | |
| Ground | | 6 | 6 | 7 |
| Ground | | 9 | 9 | 8 |
| Ground | | 14 | 14 | |
| Ground | | 20 | 20 | |
| Ground | | 25 | 25 | |
| Ground | | 30 | | |
| Ground | | 34 | | |
| Ground | | 39 | | |
