home-assistant.io/source/_docs/z-wave/installation.markdown

---
layout: page
title: "Z-Wave"
description: "Installation of the Z-Wave component."
date: 2017-09-21 10:00
sidebar: true
comments: false
sharing: true
footer: true
redirect_from: /getting-started/z-wave-installation/
---

Z-Wave can be configured using the Z-Wave *Integration* in the *Configuration* menu, or manually using an entry in `configuration.yaml`

## {% linkable_title Configuration %}

```yaml
# Example configuration.yaml entry
zwave:
  usb_path: /dev/ttyACM0
  device_config: !include zwave_device_config.yaml
```

{% configuration zwave %}
usb_path:
  description: The port where your device is connected to your Home Assistant host. Z-Wave sticks will generally be `/dev/ttyACM0` and GPIO hats will generally be `/dev/ttyAMA0`.
  required: false
  type: string
  default: /zwaveusbstick
network_key:
  description: The 16-byte network key in the form `"0x01, 0x02..."` used in order to connect securely to compatible devices. It is recommended that a network key is configured as security enabled devices may not function correctly if they are not added securely.
  required: false
  type: string
  default: None
config_path:
  description: "The path to the Python OpenZWave configuration files. NOTE: there is also the [update_config service](/docs/z-wave/services/) to perform updating the config within python-openzwave automatically."
  required: false
  type: string
  default: the 'config' that is installed by python-openzwave
autoheal:
  description: Allows disabling auto Z-Wave heal at midnight.
  required: false
  type: boolean
  default: true
polling_interval:
  description: The time period in milliseconds between polls of a nodes value. Be careful about using polling values below 30000 (30 seconds) as polling can flood the zwave network and cause problems.
  required: false
  type: integer
  default: 60000
debug:
  description: Print verbose z-wave info to log.
  required: false
  type: boolean
  default: false
device_config / device_config_domain / device_config_glob:
  description: "This attribute contains node-specific override values. NOTE: This needs to be specified if you are going to use any of the following options. See [Customizing devices and services](/docs/configuration/customizing-devices/) for the format."
  required: false
  type: string, list
  keys:
    ignored:
      description: Ignore this entity completely. It won't be shown in the Web Interface and no events are generated for it.
      required: false
      type: boolean
      default: false
    polling_intensity:
      description: Enables polling of a value and sets the frequency of polling (0=none, 1=every time through the list, 2=every other time, etc). If not specified then your device will not be polled.
      required: false
      type: integer
      default: 0
    refresh_value:
      description: Enable refreshing of the node value. Only the light component uses this.
      required: false
      type: boolean
      default: false
    delay:
      description: Specify the delay for refreshing of node value. Only the light component uses this.
      required: false
      type: integer
      default: 5
    invert_openclose_buttons:
      description: Inverts function of the open and close buttons for the cover domain. This will not invert the position and state reporting.
      required: false
      type: boolean
      default: false
{% endconfiguration %}

<p class='note'>
As of Home Assistant 0.81, the Z-Wave `usb_path` and `network_key` options are configured through the Integrations page in Home Assistant. Specifying a `zwave:` section in `configuration.yaml` is no longer required unless you need to customize other settings, such as `device_config`, `polling_interval`, etc.
  
If you change the `usb_path` or `network_key` in your `configuration.yaml` then this will not be updated in the integration. You'll need to remove and re-add the Integration for these changes to take effect.
</p>

### {% linkable_title Network Key %}

Security Z-Wave devices require a network key before being added to the network using the Add Secure Node button in the Z-Wave Network Management card. You must set the *network_key* configuration variable to use a network key before adding these devices.

An easy script to generate a random key:
```bash
$ cat /dev/urandom | tr -dc '0-9A-F' | fold -w 32 | head -n 1 | sed -e 's/\(..\)/0x\1, /g' -e 's/, $//'
```

You can also use sites like [this one](https://www.random.org/cgi-bin/randbyte?nbytes=16&format=h) to generate the required data, just remember to put `0x` before each pair of characters:

```yaml
# Example configuration.yaml entry for network_key
zwave:
  network_key: "0x2e, 0xcc, 0xab, 0x1c, 0xa3, 0x7f, 0x0e, 0xb5, 0x70, 0x71, 0x2d, 0x98, 0x25, 0x43, 0xee, 0x0c"
```

Ensure you keep a backup of this key. If you have to rebuild your system and don't have a backup of this key, you won't be able to reconnect to any security devices. This may mean you have to do a factory reset on those devices, and your controller, before rebuilding your Z-Wave network.

## {% linkable_title First Run %}

On platforms other than Hass.io and Docker, the compilation and installation of python-openzwave happens when you first enable the Z-Wave component, and can take half an hour or more on a Raspberry Pi. When you upgrade Home Assistant and python-openzwave is also upgraded, this will also result in a delay while the new version is compiled and installed.

The first run after adding a device is when the `zwave` component will take time to initialize the entities, some entities may appear with incomplete names. Running a network heal may speed up this process.

## {% linkable_title Platform specific instructions %}

### {% linkable_title Hass.io %}

You do not need to install any software to use Z-Wave.

If the path of `/dev/ttyACM0` doesn't work, look in the *System* section of the *Hass.io* menu. There you'll find a *Hardware* button which will list all the hardware found.

You can also check what hardware has been found using the [hassio command](/hassio/commandline/#hardware):

```bash
$ hassio hardware info
```

### {% linkable_title Docker %}

You do not need to install any software to use Z-Wave.

To enable access to the Z-Wave stick, add `--device=/dev/ttyACM0` to the `docker` command that starts your container, for example:

```bash
$ docker run -d --name="home-assistant" -v /home/pi/homeassistant:/config -v /etc/localtime:/etc/localtime:ro --net=host --device=/dev/ttyACM0 homeassistant/raspberrypi3-homeassistant
```

If the path of `/dev/ttyACM0` doesn't work then you can find the path of the stick by disconnecting and then reconnecting it, and running the following in the Docker host:

```bash
$ ls -1tr /dev/tty*|tail -n 1
```

### {% linkable_title Hassbian %}

You do not need to install any software to use Z-Wave.

To find the path of your Z-Wave USB stick, disconnect it and then reconnect it to your system and run:

```bash
$ ls -1tr /dev/tty*|tail -n 1
```

### {% linkable_title Community install methods %}

#### {% linkable_title Raspberry Pi specific %}

On the Raspberry Pi you will need to enable the serial interface in the `raspi-config` tool before you can add Z-Wave to Home Assistant.

#### {% linkable_title Linux (except Hassbian) %}

On Debian Linux platforms there two dependencies you will need to have installed ahead of time (included in `systemd-devel` on Fedora/RHEL systems):

```bash
$ sudo apt-get install libudev-dev
$ sudo apt-get install libopenzwave1.5-dev
```

You may also have to install the Python development libraries for your version of Python. For example `libpython3.6-dev`, and possibly `python3.6-dev` if you're using Python 3.6.

##### {% linkable_title Finding the controller path %}

To find the path of your Z-Wave USB stick, disconnect it and then reconnect it to your system and run:

```bash
$ ls -ltr /dev/tty*|tail -n 1
```

That will give you a line that looks something like this:

```bash
crw-rw---- 1 root dialout 204, 64 Sep 21 10:25 /dev/ttyACM0
```

Where the date and time displayed is approximately the time you connected the USB stick or module (it may also be something like `/dev/ttyAMA0` or `/dev/ttyUSB0`). The number will be zero for the first device connected, and higher numbers for later devices.

Or, if there is no result, try to find detailed USB connection info with:

```bash
$ dmesg | grep USB
```

If Home Assistant (`hass`) runs with another user (e.g., *homeassistant*) you need to give access to the stick with:

```bash
$ sudo usermod -aG dialout homeassistant
```

The output from `ls -ltr` above contains the following information:
* The device type is `c` (character special)
* The permissions are `rw-rw----`, meaning only the owner and group can read and write to it
* There is only `1` link to the file
* It is owned by `root` and can be accessed by members of the group `dialout`
* It has a major device number of `204`, and a minor device number of `64`
* The device was connected at `10:25` on `21 September`
* The device is `/dev/ttyUSB0`.

#### {% linkable_title macOS %}

When installing on macOS you may have to also run the command below ahead of time, replace "x.x" with the version of Python (`$ python3 --version`) you have installed.

```bash
$ sudo /Applications/Python\ x.x/Install\ Certificates.command
```

On macOS you can find the USB stick with:

```bash
$ ls /dev/cu.usbmodem*
```

## {% linkable_title Troubleshooting %}

### {% linkable_title Device path changes %}

If your device path changes when you restart, see [this guide](http://hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/) on fixing it.

### {% linkable_title Component could not be set up %}

Sometimes the device may not be accessible and you'll get an error message upon startup about not being able to set up Z-Wave. Run the following command for your device path (here we're using `/dev/ttyAMA0` for our Razberry board):

```bash
$ ls -l /dev/ttyAMA0
```

You should then see something like this:

```
crw-rw---- 1 root dialout 204, 64 Apr  1 12:34 /dev/ttyAMA0
```

The important pieces are the first piece `crw-rw----` and the group `dialout`. If those are different then, for your device path, run:

```bash
$ sudo chgrp dialout /dev/ttyAMA0
$ sudo chmod g+rw /dev/ttyAMA0
```

Check too that the account you're running Home Assistant as is in the `dialout` group. For instance, if you're using `homeassistant`:

```bash
$ groups homeassistant
```

That should include `dialout`, if it doesn't then:

```bash
$ sudo usermod -aG dialout homeassistant
```

### {% linkable_title Unable to install Python Openzwave %}

If you're getting errors like:

    openzwave-embed/open-zwave-master/libopenzwave.a: No such file or directory

Then the problem is that you're missing `libudev-dev` (or the equivalent for your distribution), please [install it](/docs/z-wave/installation/#linux-except-hassbian).