Location Aware Notification Lights with Node-Red and IFTTT

I am in the habit of going on cooking sprees while listening to music… loudly. I only share one wall with a neighbor here in the loft, and that neighbor is very tolerant. On a Sunday afternoon, with multiple dishes going at a time, my most used smart home feature is “Alexa, set a meatball timer for 25 minutes”. Having Alexa keep track of all my timers is really helpful when my hands are full. The problem is that I rarely hear the timer, and have burned a few things not paying attention.

Using IFTTT, Node-Red, and Home Assistant I can blink the lights in the room when the Alexa timer goes off – even if I wander off to a different room.

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More Nodes for Home Automation: state-machine, actionflows, dashboard, statistics

I’m keeping a running list of useful nodes I’ve found for home automation. Here’s a couple of more I came across recently in the Node-Red library.

  • dashboard – Create an entirely custom, live dashboard. Amazing!
  • statistics – Some useful statistical functions, based on Simple Statistics
  • state-machine – Manage a state machine with your own parameters
  • actionflows – This one seems extremely promising. Package flows as reusable functions that can be looped, prioritized, and benchmarked.

I think making a dashboard is my next project, which I will certainly document here on the blog.

I am wondering if state-machine could be used to manage the state of a finicky IR controlled fan I have. I was never able to find a way to do this in Home Assistant accurately. Since Node-Red can do more complicated logic, it could monitor my fan related sensors and output in the format for the MQTT Fan component. Interesting!

Morning Radio

Going Further with Home Automations in Node-Red

In my last post about using Node-Red to make automations with Home Assistant, I showed some very simple flows for turning lights on and off. While it is important to get used to the Node-Red way of doing things and it’s interface, none of the examples in my post are very compelling. All of that can easily be accomplished in Home Assistant already, so what makes Node-Red so awesome?

Let’s examine some of Node-Red’s features a little closer to get a better idea of what’s going on, how we can use that to create dynamic automations with Home Assistant, and an example of an alarm clock radio flow that uses some advanced logic nodes.

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Useful Sensor: Cardinal Wind Direction for Home Assistant

At a glance – gustier than usual this morning.

As someone who cycles to work most days, I keep a pretty close eye on the weather. One thing I like to know is which way the wind is blowing – a strong headwind means I should maybe opt for the road bike, not the cruiser. Home Assistant has a ton of weather platforms – and the Dark Sky one that I prefer tracks wind direction. The only problem is it returns the direction in degrees, which is meaningless to me.

See below for a template sensor that will convert degrees to a human-readable cardinal direction.

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Useful Sensor: Bayesian Sleep Detection in Home Assistant

Sleep is not something I can directly observe in my smart home (at least not until I build that DIY bed sensor). It would be nice to know though – then the alarm could be set, doors locked, thermostat set, music volume slowly dimmed, and internet bandwidth reprioritized automatically when it’s time for bed. We spend a lot of time sleeping in our homes, so it makes sense to be able to detect it.

Using Home Assistant’s Bayesian binary sensor it’s possible to guess pretty accurately when everyone’s tucked away. See below for example YAML and explanation.

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Home Assistant: Making My Plants Talk with IoT Sensors and a Python Script

Living in an urban city without a garden, I have been exercising my green thumb by accumulating more and more houseplants. I have them tucked away in every light-filled corner, hanging from every rafter in my tall ceilings. Which is a problem, because I have to get a ladder out to water most of them!

Using some cheap plant soil sensors and a simple Python script, I will have Home Assistant check all of my plants and make a list of which need my attention. Then when more than a few need to be watered, I can be notified or have the voice assistant give me an update.

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Useful Sensor: Motion Last Seen & Meta Motion Sensor

You know what’s great about motion sensors? They are very, very cheap to build yourself. All it takes is an esp8266 module like the Wemos D1 Mini, some PIR sensors, and the ESP Easy firmware and you can have a bunch up and running in a few minutes. I haven’t DIYed a battery powered one yet, but there are plenty of great Z-Wave ones available.

Once you have a couple of motion sensors in your smart home, you can have Home Assistant track the last place it saw motion. This is a useful bit of info – useful as a condition for your automations, or as an input for a bayesian binary sensor. See below for YAML to create a meta-motion sensor with a history.

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Basic Node-Red Flows for Automating Lighting with Home Assistant

Smart light bulbs are probably the first thing everyone getting into home automation buys. It is easy to see the applications for them – have the lights come on at night, turn off when you’re home, etc. It’s very satisfying to have the lights react to the day and your activities, and my goal with automating lighting has always been to not have to think about it, for it to work in the background.

In my initial post about Home Assistant and Node-Red, I explained the initial hoops you have to jump through to get both pieces of software up and running and talking to each other. Now we will start using them together in some very simple flows to control lighting, to get a better understanding of how Node-Red works, and to start to delve into this powerful tool.

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Auto-Downloading Youtube Videos for Plex Media Server with youtube-dl

Recently it appears Youtube has decided they want to become cable TV, complete with the unending commercials for American pharmaceuticals. Since I cannot stand watching any advertising, am cloud averse, and also don’t like Youtube’s terribly busy interface, I have automated downloading of channels and playlists I follow with the wonderful youtube-dl tool into my Odroid XU4 based Plex Media Server.

Downloading is pretty straight forward as long as we take care to follow Plex’s file naming guidelines. Getting all the metadata in without doing any work requires a little bit of configuration, and to automate it all takes a few simple shell scripts.

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Big List of Useful Home Automation Nodes for Node-Red

An ongoing list of nodes I have found useful for constructing home automation flows. I have not included device platform nodes, as all state tracking and actions are performed in Home Assistant.

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