Johan Hammar

Running Home Assistant in a Docker environment

Sun, 08 Nov 2020 19:55:00 +0000

Setting a static ip on your Raspberry Pi

Mon, 28 Aug 2017 19:55:00 +0000

Setting a static ip on your Raspberry Pi can be tricky, here’s what you need to know.

The easiest way to set a static ip is to add the configuration in /etc/dhcpcd.conf. Edit the file in your favorite editor and scroll down to the bottom of the file.

Add the following configuration:

interface eth0
static ip_address=192.168.1.10/24
static routers=192.168.1.1
static domain_name_servers=192.168.1.1

Make sure the interface and the network configuration matches your requirements.

How to configure a switch in Domoticz

Mon, 28 Aug 2017 19:55:00 +0000

This is a note to self on how to configure an ac outlet using RFXtrx433 in Domoticz.

Browse to your Domotics instance and go to the “Switches” tab
Click on Manual Light/Switch
Now configure the new device:
1. First give the new device a new name
2. Switch Type should be On/Off
3. Change Type to AC
4. Give the device a unique random id
5. Set the outlet in “learn mode” and click “Test”
Done!

Installing Node.js on a Raspberry Pi 3

Wed, 02 Nov 2016 19:55:00 +0000

Recently I bought a new Raspberry Pi 3 and wanted to run a few Node.js applications on it. Unfortunately the Node.js version that is available on Raspbian is quite old.

Don’t worry, it’s easy to install. Follow the instructions below and you’re all set.

$ sudo apt-get update
$ curl -sL https://deb.nodesource.com/setup_7.x | sudo bash -
$ apt-get install nodejs

Verify the installation with node -v. It should output something like v7.0.0

Weather Forecast in the terminal

Thu, 18 Feb 2016 10:00:00 +0000

Here’s a nice trick I saw the other day. Run $ curl -4 wttr.in/Göteborg and you’ll get a nice looking forecast in the terminal.

Binero DynDNS

Thu, 18 Feb 2016 06:00:00 +0000

I have an old Synology DS213j NAS that I want to use for DynDNS. Now Synology does support DDNS but does not come with my DynDNS provider, Binero, preconfigured. Follow these easy steps to add support for Binero DynDNS in your Synology NAS

Prerequsities - Verify that DynDNS is correctly setup.

Use curl or a browser and call https://EMAIL:PASSWORD@dyndns.binero.se/nic/update?hostname=HOST&myip=IP make sure you set EMAIL, PASSWORD, HOST and IP
You should get a response that says good or similar.

Add Binero DynDNS to Synology

Use SSH and log into your NAS.
Edit /etc.defaults/ddns_provider.conf and add the this block at the end of the file

[Binero]
  modulepath=DynDNS
  queryurl=dyndns.binero.se/nic/update?hostname=__HOSTNAME__&myip=__MYIP__

Now log into your NAS and open Control Panel -> External Access and click on Add in the DDNS tab. Binero should now be in the list of Service Providers
You’re all set up! You should see your service provider and hostname in the list and status should be Normal

Today I Learned

Wed, 17 Feb 2016 09:20:57 +0000

A few days ago I saw a post on Hacker News.

A guy had been writing daily TILs for a year and published them to a GitHub repository.

The post seems to have gotten some positive traction and I was inspired to create my own TIL-repository. Feel free to fork or open a PR if you find anything that can be improved.

New blog!

Wed, 17 Feb 2016 08:00:57 +0000

Once every year I try to start blogging. I’ve tried several different solutions but most of my attempts have been using self hosted Wordpress installations. Wordpress is great but it is also a bit overkill. Managing databases, users, plugins etc. is too much for me, I just need a place where I can write my thoughts down.

So, what’s different this time? For starters I will use Jekyll and host the blog on GitHub Pages. Hopefully this means I won’t have to administrate the blog too much.

I don’t plan to have a comment section, in my previous blogging attempts I have been hit quite badly with comment spam. However, don’t hesitate to contact me. see details below.

Johan