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Text-to-Speech in openHAB

In my ongoing endeavor to improve our home, a while ago I added a notification when the washing machine and the dryer are finished. The notification is send to a Telegram channel. Over the summer vacation I added a number new ChromeCast Audio devices (Google no longer offers the Audio CC, if you need one get one now). One is placed in the kitchen. Not only can I listen to music while eating breakfast, I can also output notifications, by using the CC as an audio sink in openHAB.

To make that useful, I decided to use a Text-to-Speech system. openHAB offers a couple different TTS systems, however most of them need a cloud integration, and therefore a working Internet connection. The "Pico TTS" works standalone, and was my favorite choice for this implementation.

 

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openHAB and Tankerkönig gas prices + Telegram integration - Second iteration

In my previous blog post about "Tankerkönig" I explained the details of how to integrate this binding into openHAB and provide a Telegram interface.

Someone on the openHAB community forum pointed out that Telegram bots allow queries, where one can present the user with options, and the user only has to click on one of the options. That makes it easier to use, and less typing is required as well. I went ahead and implemented that.

 

 

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Install openHABian image on Linux

My plan is to reinstall openHABian on a bigger SDcard, and on a Raspberry Pi 4. The latest release (v1.5) supports the new Pi 4, and I decided it's time to do a fresh install, and see if all my Playbooks are still working.

Raspberry Pi 4 with Sectronics Armor (cooling) Case

As always, I'm searching my shell history for the right command how to install the image ... but came up empty.

 

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Improve openHAB Rules response time

By default, openHAB only starts 5 threads to deal with execution of Rules. That's not a lot, and if all threads are busy, rules have to wait until a slot is free. This results in slow Rule response time.

This can be improved.

 

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openHAB: Turn display on and off for a Video ChromeCast

After figuring out if a ChromeCast is currently used, it was time to fix a long-standing problem. At home we don't have TVs, just "dumb" displays, and stream content using ChromeCasts. However a video ChromeCast never really turns off, but keeps the display running, using a "Backdrop" app. This app keeps showing pictures on the display when the ChromeCast is not used otherwise, effectively preventing any powersafe mode.

That's both annoying (who wants to have pictures shown in the living room or working room all night), and consumes energy. It's also intentional by Google. So far we had to turn the display on and off manually, which is inconvenient.

 

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openHAB: detect if a ChromeCast is currently used or idle

We have a couple of Audio and Video ChromeCasts in use. For an upcoming project I need to figure out if any of them is currently used. That is different for the Audio and the Video devices: the Audio just goes idle=ON, the Video devices however load the "Backdrop" app and show pictures when idling. Google for whatever reason does not want the attached monitor to go in powersafe mode. So much for saving energy ...

All of the action needs between a few milliseconds and 2-3 seconds once you start/stop using the ChromeCast.

A previous blog post explains how I add the ChromeCast devices. And I have monitoring in place.

 

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Deutscher Wetterdienst notifications in openHAB and Telegram

The "Deutscher Wetterdienst" DWD (German Weather Service) provices a service which sends out alarms for upcoming events, like heavy rain, storm, blizzard, strong winds ect. This service is only available for Germany. And it has a binding for openHAB. Time to integrate this, activate a number of regions I'm interested in, and send notifications to our mobile phones.

At this point I'm really happy that I deploy my openHAB with Ansible, I can use the Template module and loop over the Items, Things and Rules.

The Binding can "track" multiple regions, so called Cell IDs. I'm interested in 4 different Cells (the list is available here), your mileage might vary. For each reagion there can be multiple messages - and although every single example I found only assumes there is only one message (warningCount=1), I already had a situation where a Cell had two warnings. That information likely goes missing if you set warningCount to 1. Given how much configuration overhead it is when you add more channels, I can understand why most examples stay at "1" for warningCount. Doubling the number doubles the number of Items (12 -> 24). However since I deploy everything in a template, that's not a problem here.

I started this with a generous warningCount=5 - and in my templates I just loop from 1 to 5, and over every Cell, and generate all the necessary Things and Rules for every channel.

Ok, the details:

 

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openHAB and Tankerkönig gas prices + Telegram integration

In Germany, every gas station must report gas prices online, to the "Markttransparenzstelle für Kraftstoffe". Businesses and users can then fetch this data and provide services. One of these companies is Tankerkönig, and there's also a Binding for openHAB.

If you are interested in gas prices for certain gas stations, you need to sign up for a (free) API key, and figure out the IDs of the gas stations. For that go to this website, Position the blue marker on the location you are interested in, and then click on all the gas stations you want to include. Finally click on "Tankstellen übernehmen" - this will open a JSON with the data, from there extract the "id" (and possibly the other data as well).

 

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Move InfluxDB data directory to a SDcard

For my openHAB system I installed InfluxDB (on a separate) Raspberry Pi. The Pi has a 32 GB SDcard, but that is not enough for storing all the data, and that Pi has additional work to do as well. For that reason I also attached a 1 TB disk to the Pi, and mounted it on /data. Now all I have to do is move the InfluxDB data directory to /data.

 

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Monitor ChromeCast status in openHAB

I really like to monitor things, to catch issues early on. In our home we have a couple ChromeCasts, both Audio and Video. They are all connected to the openHAB system, Once in a while they stop working, and need to be restarted (unplugged and plugged in again). Unfortunately you usually only find that out when you want to stream something, and wonder why either the ChromeCast does not show up in the device list, or does show up but does not accept the media.

Therefore I decided to monitor the devices in openHAB.

 

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