If water in the child bathroom exceeds 38°C, or the child stays alone behind a closed door for 15+ minutes — instant notification.
Trigger
Water temp sensor > 38°C OR motion in bathroom + closed door > 15 min
Action
Telegram alert + audio chime in living room + bathroom RGB pulses red
Devices needed
Why it helps
The bathroom is one of the riskiest rooms for a small child: water that runs too hot at the tap, and moments when the little one stays alone behind a closed door. In a Chișinău apartment, where parents are often cooking dinner or working in another room, a few minutes of inattention can matter. This automation doesn't replace a parent's supervision — it adds a quiet safety net: it watches the water temperature and prolonged time in the bathroom, then draws attention right away, before an ordinary situation turns into an unpleasant one.
How it works
The logic rests on two independent conditions. First: a Zigbee temperature sensor placed near the tap or in the bath area tracks the water temperature and triggers when it exceeds 38°C — the threshold above which water becomes too hot for a child's sensitive skin. Second: a motion sensor confirms presence in the bathroom while a Zigbee door/window sensor shows the door is closed; if that combination lasts longer than 15 minutes, the system reads it as a child left alone for too long. Either condition starts the response.
The reaction is designed to be hard to miss: an instant Telegram notification to the parents' phone, an audio chime on the living-room speaker, and the bathroom RGB lamp pulsing red as a local visual cue. CasaSmart builds this automation on a local Home Assistant hub installed in your home, so the trigger logic and thresholds run on your own network without depending permanently on the internet (the Telegram notifications, being an external service, do need a connection). The Zigbee sensors talk through a dedicated coordinator, and the mounting near the plumbing — work involving a socket and cabling — is done by our electrician. Thresholds, durations, and notification recipients are tuned together with you.
Setup steps
Together we map where the tap is, how the child's bathroom is laid out, and which thresholds suit you — the maximum water temperature and the delay before you get the alert. We check for a socket and a cabling route for the RGB lamp.
Our electrician mounts the Zigbee temperature sensor near the water zone, the door/window sensor on the bathroom door, the motion sensor in the room, and the RGB lamp. Everything connects to the Zigbee coordinator of the local Home Assistant hub.
We configure the two conditions (temperature > 38°C; motion + closed door > 15 min), link the Telegram notification to the parents' phones, the audio chime to the living-room speaker, and the red pulse of the bathroom lamp.
We simulate both scenarios, confirm the alerts arrive correctly, and adjust thresholds if there are nuisance triggers. We show you how to change recipients and temporarily disable the rule, for example during bathroom cleaning.
Practical tips
FAQ
No. It's an additional safety net that flags water that's too hot or a prolonged presence in the bathroom. Responsibility for watching the child remains entirely with the adult.
38°C is the threshold above which water becomes too hot for a child's sensitive skin, the value chosen for this automation. We can adjust it together during setup, according to your preference.
The trigger logic and thresholds run on the local Home Assistant hub, so the sensors and in-home responses — the lamp's red pulse and the living-room chime — can keep working locally. The Telegram notification, being an external service, needs an internet connection.
A Zigbee temperature sensor, a Zigbee door/window sensor, a motion sensor, and a bathroom RGB lamp, connected to a local Home Assistant hub. We integrate and configure them; the mounting near the plumbing is done by our electrician.
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