My mum kept leaving the iron on.
Every visit, I’d find it still plugged in, sitting on the ironing board cover she’d forgotten to put away. She’d been doing it for years — a habit so ingrained she didn’t notice anymore. But I noticed. Every time I drove home, that iron sat there like a small fire hazard waiting to happen.
So I bought a smart plug.
Problem solved. Now the iron turns off automatically at 9 PM, whether she remembered or not. She didn’t have to change anything. No new habits, no new apps to learn. Just a plug that does the right thing.
That’s what this guide is about: finding the one or two smart devices that solve a specific problem, without turning your parent’s home into a science project.
Before You Buy Anything: Network Security First
Home automation means networked devices in your parent’s home. That means attack surface. A poorly secured smart device is a door into the rest of the network.
Do these three things before you plug in anything:
1. Update the router firmware. Log into the router (usually 192.168.1.1 or 192.168.0.1 in a browser) and check for a firmware update option. If the router is more than 5 years old and hasn’t had an update in over a year, consider replacing it — a €60 modern router is cheaper than cleaning up a compromise.
2. Change the Wi-Fi password. I know. But if the password is still the default Netgear123 that came printed on the router, it’s not secure. 12+ characters, mixed case, numbers, symbols.
3. Set up a guest network. Most routers can create a second Wi-Fi network labelled “Guest” or “IoT.” Put all smart home devices on this network. If one of them gets compromised, it can’t reach the computers and phones on the main network. This takes 10 minutes and significantly reduces the risk.
The Right Philosophy: Local Over Cloud, Cheap Over Expensive
Most smart home devices work like this: the device talks to the manufacturer’s cloud, the cloud talks to the app, the app talks to you. It works. But it has two problems:
- It breaks when the internet is out. If the Wi-Fi goes down, so does the automation.
- You’re trusting a company that might raise prices, shut down, or get breached.
Look for devices that support local control — they work over the local network without going through the manufacturer’s servers.
The cheapest path is DIY. You don’t need to buy expensive commercial products. For €3–8 per device, you can build your own smart plugs, motion sensors, and leak detectors that work locally and never require a subscription. More on this below.
The middle ground: buy devices from brands that explicitly don’t require subscriptions and work over local Wi-Fi (TP-Link Tapo, Shelly).
The premium option: run a Home Assistant instance on a Raspberry Pi 4 (€50–70) or an old laptop. One dashboard, one app, controls everything locally. Worth it if you’re managing more than five devices.
DIY Home Automation — Build It Yourself for Under €10 per Device
Here’s the thing nobody tells you: you don’t need to buy €20 smart plugs. You can build your own for €5–8, and they’ll work better — locally controlled, no subscription, fully customizable.
The DIY approach uses two tools:
- ESPHome — firmware that runs on cheap microcontrollers (ESP8266, ESP32). You write a YAML config, flash it once, and the device works locally forever via Wi-Fi.
- Home Assistant — connects to your DIY devices over your local network. No internet required.
Here’s what you can build:
DIY Smart Plug (€5–8)
Buy a Tuya-compatible smart plug (€5–8 on AliExpress or Amazon) and flash it with Tasmota firmware using a free tool called Tuya-Convert. YouTube has step-by-step videos — it takes 10 minutes and requires no soldering.
What you get:
- Works locally over Wi-Fi (no cloud dependency)
- Fully controllable from Home Assistant
- No subscription, ever
- Costs 60% less than a Shelly Plug S
Which plugs to buy for flashing: Look for “Tuya Smart Plug” or “Smart Life compatible plug” on AliExpress. Avoid anything labeled “works only with Tuya app” if you want to flash it. The flashed version is indistinguishable in use — it just works locally.
DIY Motion Sensor (€4–6)
Buy a PIR motion sensor module (HC-SR501, ~€1 on AliExpress) and an ESP8266 board (D1 Mini, ~€3). Connect two wires, write a 10-line ESPHome config, and you have a motion sensor that talks directly to Home Assistant.
esp8266:
board: d1_mini
binary_sensor:
- platform: gpio
pin: D1
name: "Hallway Motion"
device_class: motion
That’s the whole config. The sensor detects motion, sends a message to Home Assistant over Wi-Fi, and Home Assistant triggers whatever automation you defined. No cloud, no subscription, costs €4 total.
DIY Leak Detector (€3–5)
Buy a water leak sensor (two metal probes, €1) and an ESP8266 D1 Mini (€3). When the probes detect water, it triggers a notification to your phone via Home Assistant. Loud buzzer included.
You can wire it to a 12V buzzer so it makes a noise even if Home Assistant is down — perfect for a washing machine leak that needs to be heard from the next room.
DIY Smart Switch / Relay (€4–6)
The Shelly 1 (€8) or a D1 Mini with a relay module (€4) lets you control anything — a lamp, a heater, a gate motor. Wire it in parallel with the existing switch so the manual button still works. Your parent can use the wall switch as normal, and you can also control it from your phone.
Shelly 1 is the easiest option: it fits behind the existing wall switch, requires no neutral wire in some configurations, and works locally with Home Assistant out of the box.
Zigbee — The DIY Middle Ground
If you don’t want to solder or flash firmware, Zigbee is the answer. Zigbee is a low-power wireless protocol used by most commercial smart home devices. A Zigbee coordinator (€15–20, CC2652P stick) plugged into your Home Assistant Raspberry Pi lets you connect dozens of Zigbee devices — motion sensors, door sensors, smart plugs, leak detectors — all communicating locally.
Brands like Aqara, Tuya, and IKEA Tradfri sell Zigbee devices that work with any Zigbee coordinator. Prices are low because the protocol is open:
- Zigbee smart plug: €8–12
- Zigbee motion sensor: €10–15
- Zigbee door/window sensor: €6–10
- Zigbee temperature sensor: €8–12
All local, all controllable from one Home Assistant dashboard, all running on coin batteries that last 2–3 years.
The Home Assistant Brain (€50–70)
Whether you go ESPHome, Zigbee, or commercial Tapo/Shelly devices, you’ll want a central hub to tie it all together.
The cheapest option: Install Home Assistant OS on a Raspberry Pi 4 (4GB, ~€50) using a microSD card (32GB, ~€8). Total cost: ~€60. Download the Raspberry Pi Imager from raspberrypi.com, flash Home Assistant OS, boot it up, follow the setup wizard. One-hour setup, works completely offline.
If you have an old laptop collecting dust, install Home Assistant as a virtual machine — it’s free and your parent probably won’t notice their old PC is now a smart home server.
Budget Comparison: Commercial vs DIY
| Solution | Per Device Cost | Setup Complexity | Long-term Cost |
|---|---|---|---|
| Commercial (Tapo, Shelly) | €12–20 | Easy (just an app) | Zero (no subscription) |
| Commercial (Ring, Nest, etc.) | €30–150 | Easy | €5–10/month subscription |
| Zigbee + Coordinator | €8–15 | Medium | Zero |
| DIY ESPHome | €3–8 | Advanced (but YouTube tutorials exist) | Zero |
| Recommended for most people | €8–15 | Easy to medium | Zero |
My recommendation: start with Tapo P110 plugs (no flashing needed, works with Home Assistant) for the quick wins (the iron, the heater). Then add a Zigbee coordinator if you want to expand. Go full DIY only if you enjoy the building part — and many people do, because it’s genuinely satisfying to flash a €5 Tuya plug and have it work better than the €25 commercial version.
What to Actually Buy
Here’s the equipment list I recommend for most situations. Start with the first item and expand from there.
Smart Plug — The Best Starting Point
What it solves: Lamps left on overnight, appliances left running, anything that needs a simple on/off.
What to buy:
- TP-Link Tapo P110 (~€12–15) — no subscription, works locally with Home Assistant, compact, doesn’t block the second outlet socket
- Shelly Plug S (~€15–18) — also local-control friendly, slightly more powerful, more technical
What to avoid: Anything from brands with mandatory subscription apps (Ring, Wyze for some features). A €5 smart plug that requires a €5/month subscription costs €65/year — buy the better plug instead.
How to set it up: Plug it in, download the Tapo app (or Shelly app), connect it to Wi-Fi, name it clearly (“Living Room Lamp”, not “Device_3”). That’s it.
Motion Sensor — Fall Prevention
What it solves: Lights turning on automatically when walking to the bathroom at night. No fumbling for switches in the dark.
What to buy:
- Aqara Motion Sensor P1 (~€20) — 5-year battery life, works with Home Assistant, wide detection angle
- TP-Link Tapo T100 (~€15) — cheaper, still local-control capable
Setup tip: Place one in the hallway between bedroom and bathroom. Set it to trigger a low-level nightlight for 3 minutes when motion is detected. No app interaction required — it just works.
Leak Detector — Water Damage Prevention
What it solves: Dishwasher overflows, washing machine hose bursts, radiators leaking. Water damage is one of the most expensive home insurance claims.
What to buy:
- Aqara Water Leak Sensor (~€15) — tiny, loud buzzer when triggered, works with Home Assistant
- Honeywell Home Water Leak Detector (~€30) — louder buzzer, optional external probe cable for hard-to-reach places
Placement: Under the washing machine, under the kitchen sink, near the dishwasher, next to the water heater. Anywhere a slow leak could cause damage before it’s noticed.
Smart Lock — For When Keys Get Lost
This one is more personal. Smart locks are useful for parents who forget their keys, or for adult children who need remote access to let in carers or family.
What to buy:
- Nuki Smart Lock 3.0 (~€230) — fits over the existing deadbolt, no need to change locks, works with Home Assistant
- Aqara U200 (~€120) — more affordable, bolt-on solution, supports Matter
Honest note: Smart locks add complexity. They need firmware updates, battery changes, and occasionally troubleshooting. Only add this if there’s a genuine ongoing problem (frequently lost keys, a carer who needs access) — don’t add it because it seems cool.
Video Doorbell — The Right Way
A doorbell camera is genuinely useful: you can see who’s at the door without getting up, and it records anyone who rings while you’re out.
The privacy rule: No cameras inside the home. Entryway cameras only.
What to buy:
- Reolink Video Doorbell (Wi-Fi) (~€50) — local storage option (no subscription required), works with Home Assistant
- Eufy Security Video Doorbell (~€60) — local storage, no monthly fee, but check their cloud privacy track record before choosing
What to avoid: Anything that only works with a mandatory cloud subscription. The storage subscription on doorbells typically costs €3–5/month — that’s €36–60/year, and the camera stops working if you stop paying.
The Automation Rules to Set Up First
Don’t create complex automations. Start with these:
1. “If motion detected in hallway between 10 PM and 6 AM, turn on hallway light at 20% brightness for 3 minutes.”
This is the highest-impact automation for safety. A dim light on during a nighttime bathroom trip prevents falls — the leading cause of injury deaths in adults over 65.
2. “Turn off [iron/heater/kettle] at 9 PM every day.”
Whatever the specific worry is. Smart plugs can schedule a daily off-time. No automation required — just a schedule.
3. “If water leak detected, send alert to phone.”
Home Assistant can send a notification to your phone the moment a leak is detected. You find out about the problem before it becomes a flood.
What NOT to Buy
A short list of things that seem like good ideas but aren’t worth it for most people:
- Smart bulbs in every room — if the light switch gets turned off at the wall, the smart bulb becomes useless. Smart switches are better but expensive and require electrical work.
- Smart thermostats — great in theory, but older parents often prefer their existing heating routine. Only add this if there’s a genuine problem (forgetting to turn heating off, overheating at night).
- Voice assistants (Alexa/Google) — useful for people who are comfortable with them, but they introduce confusion for many older users. The voice command that works 80% of the time and fails silently 20% of the time is worse than no voice control at all.
- Multiple brands — each brand requires its own app. Use one ecosystem (TP-Link Tapo, Shelly, or Home Assistant) and stick with it.
The Maintenance Checklist
Smart home devices need occasional attention. Once a quarter:
- Check for firmware updates on all devices (each app has an update button somewhere)
- Replace batteries in sensors and leak detectors (low battery indicators usually appear 2–4 weeks before failure)
- Test the automation rules — walk the hallway at 2 AM to confirm the light still comes on
- Check the smart plug scheduling still works after a power outage (some devices reset after a blackout)
- Review the Home Assistant or app dashboard — does everything still show as online?
This takes about 15 minutes per quarter. Put it in a shared calendar so you’re reminded to do it.
The Buddy Connection
Once the smart home is running, the next layer is Buddy — the companion app I built for my dad. Buddy runs on a phone and gives your parent simple, one-tap access to: their most important contacts (tap a photo to call), their medication schedule, and safety information.
Together, the smart home handles the automation, and Buddy handles the human interface. Two layers, each doing what it’s good at.
The Decision Framework
Before buying anything, ask:
- Does this solve one specific problem? If you can’t name the problem in one sentence, don’t buy it.
- Does it work locally? Cloud-only devices are a long-term liability.
- Is there a subscription? If yes, add €60/year to your mental cost calculation.
- Can I explain it to my parent in under 30 seconds? If not, it’s too complex.
- What happens if it breaks? Can you replace it yourself, or does it need an electrician?
Start Small
The best home automation system is one that nobody notices.
One smart plug. One motion sensor. Test it for a month. If it works and your parent uses it without thinking about it, add one more thing. If it’s causing questions or friction, remove it. That’s not a failure — that’s calibration.
The goal isn’t to automate everything. It’s to solve the two or three problems that actually matter.
The iron plug. The hallway light. The leak detector under the washing machine.
That’s it. That’s the whole system.
Have a specific situation? Drop me a line and I’ll help you figure out what’s actually worth setting up for your parent’s situation.