GPIO Configuration

Hardware
1

Hey there.

I’m attempting to set up GPIO Sensors in my set up. They are simply momentary switches that will perform automation.

Here is my configuration:

binary_sensor:
  platform: rpi_gpio
  ports:
    16: ButtonOne
    20: ButtonTwo
    21: ButtonThree
  pull_mode: "UP"
  bouncetime: 50
  invert_logic: false

I’m getting this error message and I’m running the latest version of Raspian.

16-08-22 00:17:04 homeassistant.components.binary_sensor: Error while setting up platform rpi_gpio
Traceback (most recent call last):
  File "/srv/hass/hass_venv/lib/python3.4/site-packages/homeassistant/helpers/entity_component.py", line 98, in _setup_platform
    discovery_info)
  File "/srv/hass/hass_venv/lib/python3.4/site-packages/homeassistant/components/binary_sensor/rpi_gpio.py", line 32, in setup_platform
    port_name, port_num, pull_mode, bouncetime, invert_logic))
  File "/srv/hass/hass_venv/lib/python3.4/site-packages/homeassistant/components/binary_sensor/rpi_gpio.py", line 49, in __init__
    rpi_gpio.setup_input(self._port, self._pull_mode)
  File "/srv/hass/hass_venv/lib/python3.4/site-packages/homeassistant/components/rpi_gpio.py", line 46, in setup_input
    GPIO.PUD_DOWN if pull_mode == 'DOWN' else GPIO.PUD_UP)
RuntimeError: No access to /dev/mem.  Try running as root!
2

Last line gives you a hint.
The user your running HA as does not have permissions to change the GPIO pins. Check that your user is in the gpio group.

3

Thank you for the heads up.

Is there a command that I can run in putty or terminal to allow the home assistant user access to the GPIO pins?

From what I know, the Raspian version should have access to this. I also see that its not best to give home assistant root access for security reasons.

4

Try this:

sudo adduser pi gpio

5

Thank you. This pointed me in the right direction. I used the same command but substituted the user hass.

Have a good one