You left the geyser on. Again.
This house hasn't had that problem in two years. Every geyser switches itself off 30 minutes after you turn it on.
Straight answers
Everyone wants it. Almost nobody knows what they'd get.
These are the six things people actually say to us. Here's what we say back.
“What if it stops working when I need it?”
It runs on hardware in your home. No internet needed for anything that matters.
“I'll end up with three apps for one fan.”
One system. Your Tuya switch, your LG TV, your Atomberg fan and your Zigbee sensor — all in one place.
“I don't understand any of this.”
You don't need to. We design it, install it and show you how it works — in your own home.
“What if the company disappears?”
The system is local and standard-based, so it keeps working. And we're in Kolkata, not a call centre.
“My father will hate it.”
Every switch still works as a switch. Nothing is app-only.
“They'll break my walls.”
Mostly retrofit. We check for the neutral wire before quoting and tell you if your board needs work.
Room by room
What your home actually does, room by room.
Not features. Outcomes — the things that happen without you touching anything.
Living room
- Lights come up when you walk in — dimmed after sunset, not full brightness at 11pm.
- Fan and lights switch off when the room empties.
- Music follows you from room to room.
Our hardware
RoomGuardian V2
Our own multi-sensor board — designed, built and supported here.
What's on the board
| BME280 | Temperature, humidity and barometric pressure |
|---|---|
| VEML7700 | Ambient light |
| LD2410 | 24 GHz mmWave radar — presence and distance, including when you're completely still |
| PIR | Motion |
That is the complete list. Nothing else is on the board.
Need to sense something the board doesn't cover? We fit the right proven sensor for it and wire it into the same system, quoted separately.
Why it matters
Most sensors detect motion. Sit still to read a book and the lights go off. mmWave radar sees you breathing, so the room knows you're there.
Working units are running in our own home today. We'll tell you honestly when it's available.
Failure modes
What happens when…
The questions people are too polite to ask. Answered before you sign anything.
…the power goes out?
Every switch remembers its state. The mains line restores itself in ten seconds. Automations resume.
…the internet goes down?
Everything local keeps running. Only remote access and voice assistants pause.
…a device drops off?
The system self-heals — and we fix it before you notice.
…Wi-Fi doesn't reach that corner?
We use Zigbee and Thread mesh. Each device extends the network.
…you go out of business?
It's local and standard-based, built on Home Assistant. It doesn't depend on us existing.
…someone hacks it?
Nothing is exposed to the internet by default. Camera footage never leaves the building. DNS filtering runs on-site.
For builders & housing societies
Sell the flat faster. And for more.
10–15%
The premium properties with modern smart features can command.
Foldable into loan
A typical builder package — buyers can fold it into the home loan instead of paying up front.
Cheaper at construction
Building it in from day one costs significantly less than retrofitting.
What we do for builders
Pre-wiring specification at the construction stage. Repeatable per-flat packages. A show flat that actually demonstrates it. Handover training for buyers. And ongoing support, so it doesn't become your service problem.
We're a young company. We'll show you a working installation before you commit to anything.
The same flat — wired at construction, handed over working.
Eldercare
For a parent living alone.
Activity patterns, without cameras in private rooms.
A message if the morning routine doesn't happen.
Lights that come on by themselves at night.
Nothing to learn. Nothing to wear. No app required.
Ask the assistant
Ask anything. We'll tell you what's actually possible.
Our assistant knows our full working setup — 1,700+ devices and 50+ automations, running in a real Kolkata home for years. Ask it about your flat, your wiring, or the devices you already own.
It can also take your callback request — share your name and number in the chat and it files the same request as the form below.
Try asking
Proof
Everything on this page already runs in one home. Ours.
1,767
devices
52
automations
12
rooms
2024
running since
GrihaTEK was built out of a working system, not a business plan. These numbers are live counts from our founder's home — not a lab, not a showroom — where every automation on this page runs every day. Before you commit to anything, we'll show it to you working.
Contact
Talk to us about a project.
Tell us what you have in mind — a flat, a house, a whole building. Leave your number and we'll call you back. No spam, no follow-up drip; one call from Kolkata.