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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Let's Encrypt

Setting Up Let’s Encrypt with Node-Red & Home Assistant

Privacy is important in the smart home, and one of the primary reasons to use Home Assistant is because it is totally under control of the user, on your own network. Since writing these posts, setting up encryption with Hass & Node-Red has been the number one question I’ve been asked about my setup. So after being lazy and just leaving my software behind a VPN and firewall, I finally git around to setting up SSL support for both Home Assistant and Node-Red.

Read below for a guide to securing your smart home with Let’s Encrypt.

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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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WIKI

Self Hosting: Setting up a Personal Wiki with DokuWiki

One of the most useful things I self host on my server is a personal wiki. I use it for note taking on projects, a journal, a beer homebrew log, storing recipes, config files, and for archiving web pages or documents. It is a great alternative to Evernote or OneNote if you want to keep your information out of the corporate cloud.

There are many wikis out there but I prefer the low-overhead DokuWiki, which is easy to install and uses flat plaintext files to store your wiki pages so it’s easy to set up anywhere and backup your data. DokuWiki as a default install is very basic and can be extended to do almost anything with a few plugins. Read below for some of my recommendations for making the most of your wiki and some example use cases.

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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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The Open Source Smart Home: Getting Started with Home Assistant & Node-Red

Home Assistant is one of the most interesting open source projects I’ve ever come across. It interfaces with any device, platform, or service you can think of. It can connect all of your devices to make a truly smart home. With a little creativity almost anything is possible with Home Assistant, and best of all it’s private and totally under your control.

After using Hass to control my smart home for the last year, I started to hit the limitations of its YAML-based configuration. Any automation that was even moderately complicated required a lot of pieces spread out through the configuration files (see the sprawling “Creating an Alarm Clock” thread on the HA forums for an example). Doing simple things like if-then or a  loop required awkward workarounds. As my automations (and ambitions) increased in complexity, so did the time I spent trying to figure out what was going on.

That’s when I discovered Node-Red, a visual programming tool developed by IBM. Node-Red is the perfect complement to Home Assistant, allowing for very complicated logic to be constructed visually through a simple “flow” interface. It integrates seamlessly with Home Assistant. Let’s set it up.

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Presence Detection Part 1: Home Assistant & Bayesian Probability

One of the most useful things to track for home automation is whether anyone is home or not. If you want the lights to turn off when no one is home, the vacuum robot to run when you’re at work, or the heat to come on before you arrive home on a cold night you need to reliably be able to tell if the house is occupied.

How can we track the state of something that is not directly observable? We can’t plug ourselves directly into the internet (…yet). After trying several approaches to monitoring presence, I’ve come up with a method that is very near 100% reliable.

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