Build your own smart home sensors — no soldering, no coding
If you have ever wanted to build your own smart home sensors but assumed it meant soldering irons and coding, the answer changed on 12 August. ESPHome — the open-source firmware a lot of serious smart homes quietly run on — shipped its first official piece of hardware: a US$40 starter kit built by Apollo Automation with the ESPHome community, first shown at State of the Open Home back in April.
It is a small thing, and it is not going to make anyone's news bulletin. We think it matters anyway, for a reason that has almost nothing to do with the hardware.
Can you really build smart home sensors without soldering or coding?
Yes — that is the whole design brief, and as far as we can tell it holds. The modules snap off a single panel and connect to the main board with a ribbon cable. No breadboard, no soldering, nothing to wire wrong. Configuration happens in the ESPHome Device Builder desktop app, in a visual editor, so you do not have to hand-write the YAML that ESPHome projects have traditionally required.
The honest caveat: "no coding needed" gets you a working sensor reporting into Home Assistant. It does not get you a polished product. You will still be deciding where a motion sensor should sit, what should happen when it trips, and why the hallway light now switches off while someone is standing under it. That part is unchanged, and it is the part that takes the evening.
What's in the box for US$40
The kit is built around the ESPHome C6 board, using an ESP32-C6-MINI-1 module — 2.4GHz Wi-Fi 6, Bluetooth LE and Thread on the one chip, with Zigbee technically possible for people who want to go digging. Four modules come with it:
- A PIR motion sensor, rated to about 3.5 metres — desk and doorway range, not whole-room coverage.
- A temperature and humidity sensor, quoted at ±0.3 °C.
- A notification module with ten RGB LEDs and a buzzer.
- A button.
Three ribbon cables and a small stand round it out. One practical note for anyone here: at launch the listed distributors are in the US, UK and Europe, so an Australian order means shipping from overseas and the landed cost will be more than the sticker. Check the current freight before you decide it is a $40 experiment.
Does it work without an internet connection?
It does, and this is the actual point. An ESPHome device talks to your Home Assistant instance on your own network. There is no vendor account, no subscription, no app that phones a server in another country to decide whether your light should turn on. If your NBN drops out — or the manufacturer loses interest in the product line three years from now — the sensor keeps working, because nothing outside your house was ever in the loop.
That is the opposite of how most cheap smart home gear is sold, and it is the single biggest reason we point people at this ecosystem. Every cloud-dependent device you install is a small bet that a company you have never spoken to will still care about it in 2030. Some of those bets have already been lost publicly.
What we'd actually use it for in a Melbourne home or workshop
The kit is too limited to be anyone's security system. What it is genuinely good for is finding out whether the whole idea is worth your time, for the price of a decent lunch:
- Prove a problem before you spend on it. Put the temperature sensor in the room you think is unbearable in February, log it for a fortnight, and you will know whether you have an insulation problem or a habit problem — with a chart instead of an argument.
- Instrument the boring corner. For a small business, the same board sits in a server cupboard, a cool room or a storeroom and tells you the moment it goes out of range. That is a $40 answer to a question that usually gets discovered by a failure.
- Learn the platform on something that doesn't matter. Better to work out how automations behave on a desk lamp than on the hot water system.
If you get through that and want the version that actually runs a house — proper sensor coverage, local voice, heating and lighting that respond to the room rather than a schedule — that is what our home automation service builds, on the same local-first foundation. And if the reason you are reading this is a house that costs too much to heat, the sensor is diagnosis, not treatment: start with Victorian Energy Upgrades rebates instead.
Either way, the kit is a good cheap way to find out what you actually want before anyone quotes you for it.
Source: Home Assistant — Get ready to start building: The ESPHome Starter Kit is here!