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Update GPIO-examples.md

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@ -62,9 +62,11 @@ See the [kernel guide](https://www.kernel.org/doc/html/latest/driver-api/pwm.htm
## I2C
**Working**: I have read temperature, pressure and humidity from a BME280 sensor connected to pins `3` and `5`.
Install [`pypi:bme280`](https://pypi.org/project/bme280/) and it's requirement `smbus-cffi`.
* I am using a [virtual environment](https://docs.python.org/3/tutorial/venv.html), rather than installing globally.
* Add the user to the group 'i2c' and re-login.
Install `i2c-tools` and add your user to the `i2c` group to access the device nodes.
The following is a python based demo that uses [`pypi:bme280`](https://pypi.org/project/bme280/)
* The BME280 library has a dependency on [`pypi:smbus-cffi`](https://pypi.org/project/smbus-cffi/); which in turn needs the `python-dev` system package.
* I am using a [virtual environment](https://docs.python.org/3/tutorial/venv.html), rather than installing the python libraries globally.
```
$ sudo apt install python3-venv python3-dev i2c-tools