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Not a purchase, but Home Assistant is easily the most enjoyable gadget and piece of tech I've had in years. It's ridiculously flexible and can do just about anything you can imagine.
I've been able to automate dumb devices (like an old top-of-the-line receiver) and give them smart features rather than spending thousands to replace them. Occupancy detection saves energy by changing thermostat settings when people aren't home, and lights come on when we're 60' from the front door after a walk. Multiple leak detectors and a temperature sensor in the fridge let us know when something's wrong before damage occurs. We get notifications when the dryer and washer cycles are complete allowing us to complete the laundry in one day instead of two.
The system is configured to change change interior light brightness and hue based on time of day so at 7PM we have bright room lighting and at 2AM it's very dim. We get immediate notifications of package deliveries with the integrated Frigate NVR and a $15 camera. Firewall settings are dynamically changed so devices that require Internet access only have it when they are actually in use. Integrations exist for VLC, Spotify, Jellyfin, Paperless, Apple, TVs, alarm systems, solar power systems, routers, automobiles, and hundreds of other brands and devices.
Yes, much of the same can be done with connected appliances, lights, and other smart devices using separate apps and control interfaces for everything, but what's different about Home Assistant is it's all integrated and all control and storage can be local. We have no cloud or corporate services involved for any of this. Google, Apple, Amazon and Samsung can't one day decide to pull the plug on things we've already paid for.
The big problem with Home Assistant is there are so many uses you can easily end up spending way too much time tinkering and never get anything else done.
How much work was it to set all that up and how much did it cost? I've messed around with home assistant, but found the upfront cost (in time and money) a bit high for automating a handful of things.
I started with things I already had, an old Raspberry Pi, some smart plugs and bulbs, an alarm system, wifi thermostat and OpenWRT router and initially installed the software just to play around. It didn't take long before I was able to control everything from a single dashboard instead of multiple web pages and apps. I found that since it connects everything it can change the thermostat and turn on lights when alarm system motion detectors or door sensors are triggered or not triggered for a few hours. Our cell phones are used for presence detection and none of that required additional hardware.
The additions beyond that have been done slowly and the costs have been minimal. At this point I've probably I've probably spent <$450 over 4 years including $180 for an inexpensive laptop. This is for something that's in use constantly. I enjoy learning and puzzles so I'd spend an hour or two here and there figuring things out. For me it's been time well spent.
Individual devices can range from dirt cheap to fairly expensive, but it all adds up over time.
Getting things initially set up is usually easy. Getting things automated correctly to your liking is a rabbit hole that is as deep as you want to dive into it.
What's really nice about HA is being able to do whatever the fuck you want whenever you want. You can take it in bites buying devices in waves and tweaking automations in waves.
That's how I've done it over the last 4 years or so.
I'm planning to install it on a spare old RPi2. I hope it'll be powerful enough. I have Broadlink RM pro that I can't wait to use without the horrible proprietary app for it.
It's likely going to be struggling with that hardware, but it should give you a look at the UI and some of the features. I've spent years running Home Assistant and am still learning new things all the time, which IMO is one of the best things about it.
It had to be normal running it on a RPi2 at one point though, right? I remember it was already around when that pi was still new.
I'm not clear on what things HA can actually do, really... I just saw it as a glorified remote control mostly I guess 😅
For most anything that can be connected to some kind of network (ethernet, wifi, zigbee, IR, z-wave) HA can do just about anything you can imagine. I keep thinking of new stuff that's not hard to implement, for instance I just set up volume leveling for difference sources on my old IR-only receiver so we don't get blasted if someone leaves the volume up high.
Since HA can use almost any info from the web you can use it to do things like control a swamp cooler based on outdoor temperature and dew point. Using windows sensors (from an alarm system or zigbee) you can shut off the heat or AC when the windows have been left open for a specific amount of time and turn them back on with the windows are closed. You can send a notification if you leave and forget to set your home alarm.
It looks like your Pi2 might be able to run the software, but that hardware was introduced 11 years ago and it wasn't a powerful device even then. HA is also depreciating 32bit hardware. If it doesn't work on that and you don't want to buy new (or used) hardware, installing a HA VM on another PC might be a good way to start.