26 lines
614 B
Markdown
26 lines
614 B
Markdown
#I2C - Inter Integrated Circuit
|
|
|
|
The Raspberry Pi's I2C pins are an extremely useful way to talk to many different types of external peripheral; from the MCP23017 digital IO expander, to a connected ATmega.
|
|
|
|
You can verify the address of connected I2C peripherals with a simple one-liner:
|
|
|
|
```bash
|
|
sudo apt-get install i2c-tools
|
|
sudo i2cdetect -y 1
|
|
```
|
|
|
|
You can access i2c from Python using the smbus library:
|
|
|
|
```bash
|
|
sudo apt-get install python-smbus
|
|
```
|
|
|
|
And then in Python:
|
|
|
|
```python
|
|
import smbus
|
|
DEVICE_BUS = 1
|
|
DEVICE_ADDR = 0x15
|
|
bus = smbus.SMBus(DEVICE_BUS)
|
|
bus.write_byte_data(DEVICE_ADDR, 0x00, 0x01)
|
|
``` |