My Home Control System

I was always fascinated by automated homes. For me it is interesting to

  • collect information about power consumption
  • remote control appliances
  • have security devices around the house

When we bought our new (very old) house in 2014, I started looking into systems like Openmotics, openHAB, home-assistant or Open Source Automation (this list can be extended endless).

What I learned during my investigation is that it is all about IoT and everything is in the Cloud. That is great when you have a reliable internet connection and an ISP that keeps you connected all the time. But what if you live in a 3rd world country (like me) and your ISP disconnects you very often without informing you and without any reason. Yesterday night my connection was down for 1 hour, last week it was 3 hours and beginning of this month we were cut off for 24 hours. Then IoT is useless and your devices are clueless what’s going on and cannot be controlled anymore.

So I put together my own requirements how MY home automation should work. None of the above listed systems fulfilled all requirements I thought about. What I disliked most is that they all rely on a server (in-house like a Raspberry Pi or external like a VPS) and they rely on a working internet connection. And they would stop working once the connection to the server or to the internet is interrupted. Then there is no more IoT and no more cloud! Of course, this problem isn’t quite as severe if you already have a good internet package – click here to see how you can find a reliable provider for your home internet too. Some providers are superior to others which is why you should do your research before settling for second or even third best.

Luckily, I’m with a great high speed internet provider so my internet is pretty fast and reliable. This means I don’t get interrupted very often unless the server connection drops.

Finding a good internet service provider was surprisingly easy, to be honest. One of my friends had made the switch to satellite internet so I decided to do the same. I read all about the benefits of satellite internet on the Satellite Internet Now website and I was able to get switched over almost immediately.

So far, I have been really impressed with my satellite internet connection so if you are considering switching to satellite, I would definitely recommend doing some research to find out whether satellite internet could be the right solution for you.

Moreover, for me, it was very important that functionality was secured so that even if my ISP decides to cut me off for maintenance (or whatever reason they come up with), my security functions should still be working even if my local WiFi network stops working.

So I came up with my own list of requirements:

  • partially functional without internet connection
  • mostly functional if server goes down
  • security devices working without local WiFi connection
  • devices should be able to talk to each other without needing a central server (e.g. a motion sensor can activate a light by sending the request directly to the device that controls the light)
  • status information and control options available on any phone/tablet connected to the local WiFi network

Check out these posts how I achieved these requirements.

So each device sends out it’s status once a minute as an UDP broadcast. Any other device can listen to these broadcasts and if the data is relevant, use the information.

Any device can send commands over TCP to any other device to initiate actions.

Now this means that each device is not only a simple sensor or actuator, but that each device has its own state-machines and intelligence to decide what to do if a certain event happens or certain data is coming in from another device.

Read Devices, tasks and communication about how the devices are linked to each other, what status messages the different devices are sending and what commands they can accept


to learn how I programmed them. I will write about my other devices in the next days and weeks.

Of course I still wanted to have information and control over my system when I am not at home. So when IoT and the Cloud is available, there should be a central unit to collect data and send to a server over MQTT (coming soon)


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