Fans in empty rooms
A 70 W fan and a 20 W tube left on through a 6-hour college day waste over half a unit — in every room, every day.
For PG, hostel & co-living owners
Empty room?
Empty room?
Everything off.
Radar presence sensors switch off lights and fans 30–60 seconds after the last person walks out — and never on a student who is asleep or studying. Add water meters per room or floor, and see exactly where your money goes.
≈27%less electricity per room*
30–60 safter the room empties
₹3,000per water monitoring point, installed
The problem
The electricity bill nobody owns.
Residents never see the power bill — you do. So fans spin in empty rooms, lights burn through college hours, and reminder notices stop working after a week.
Reminders don’t work
Notices, fines and WhatsApp groups fade within weeks. A sensor never forgets, never argues.
Flat rent, rising bills
Electricity is baked into the rent, so every wasted unit comes straight out of your margin.
Presence auto-off
Watch a room switch itself off.
A resident works at the desk, sits still, then leaves. The sensor waits, switches off the light and fan — and brings them back when someone returns.
How it works
Senses. Waits. Switches off.
A small radar sensor in each room drives a smart switch module behind your existing switchboard. Residents still use the switches by hand — the sensor only steps in when a room is empty.
- 01 · Senses
Knows who’s in
mmWave radar detects people — even someone sitting perfectly still or asleep. It senses breathing.
- 02 · Waits
Doesn’t over-react
When the room empties it waits 30–60 seconds, so a quick trip down the corridor doesn’t count.
- 03 · Switches off
Lights & fan off
The light and fan go off on their own. Nobody has to remember, and nobody has to be reminded.
- 04 · Optional
Back on when they return
Walk back in and the things that were on come back on. Or leave it to the switches — your choice per room.
Our technology
Why radar, not a motion sensor.
Most auto-off switches use PIR motion sensors. They only see movement — so at 1 am they decide a sleeping student has left, and switch the fan off. Our millimetre-wave radar senses people, not just movement.
Senses even breathing
No camera, no recording
Works in the dark
30–60 s delay
Fan switched off on a sleeping student. No movement for a few minutes, so the motion sensor assumes the room is empty.
Every day, in every PG
It knows the difference.
Three moments that happen in every room, every day — and what the room does in each.
Interactive
One day in your PG, in 40 seconds.
Eight rooms, sixteen residents, an ordinary day. Turn the sensors off and on to see where the units go — the residents do exactly the same things either way.
Without sensors0.00units so far
With Zigrock sensors0.00units so far
Saved0%—
Without sensorsWith Zigrock
Resident inAsleepOutEmpty room, left onSwitched off by sensor
Simulation: two residents per room, one 20 W tube and one 70 W fan per room. A room only counts as empty when both residents are out — about 5 hours on this day. Savings rise with how often things are left on; the calculator below uses your own numbers.
Savings calculator
What would your PG save?
Move the sliders to match your building. The maths is shown underneath — no hidden assumptions.
You could save about₹2,592a month
₹31,104a year
324units a month
27%less power per room
Per room each day: fan 8 h overnight while asleep, light + fan 10 h while someone is in, and 6 h left on in an empty room — the part the sensor switches off. 30 days a month.
What changes
Set it up once. Every room looks after itself.
Lower electricity bills
About 27% less power in a typical room, every month — more in rooms that sit empty all day.
No more reminding
No notices, no fines, no chasing residents to switch off. The room does it.
Comfort untouched
Never cuts the fan on someone asleep or studying, so residents don’t complain.
Privacy-safe
Radar only. No camera, no photos, no recording — nothing residents need to worry about.
Longer appliance life
Fewer running hours, so fans, tubes and ACs last longer between repairs.
A greener PG
Less power wasted and a smaller carbon footprint — a good line for your listing, too.
Water monitoring
Every litre, accounted for.
We fit brass flow sensors on your water lines and monitor them round the clock — so you know who uses how much, and where water is wasted.
- Fair water billing — split the bill by what each room, flat or floor actually uses
- Leaks caught early — water flowing at 3 am shows up in the data, not on next month’s bill
- Fewer tanker bills — find where water goes to waste and fix it before the next tanker
- 01 · We fit
Sensors on each line
Brass flow sensors go inline on each line you want tracked: a room, a flat, a floor or the tank outlet.
- 02 · We monitor
Counted day and night
Every sensor counts the water passing through it and reports to our system every few seconds.
- 03 · You know
Dashboard & alerts
See usage for every point, get a monthly report, and hear from us fast about unusual flow.
- 04 · You save
Fix, bill, plan
Repair leaks early, split bills fairly and plan tankers with real numbers.
See it catch a problem
One building, nine sensors.
A sensor on the main line plus one per flat. Pick a scenario and watch how the numbers give the problem away.
Overhead tank
Main line0 L
All flats together0 L
Unaccounted0 L
All lines normal. Flow drops to zero between uses and the main line matches the flats.
Illustration with made-up numbers. The dashboard below is real.
Your dashboard
Your water, on one screen.
Live flow, daily totals and busy hours on your phone or laptop. These are real readings from one of our running sensors.
Water flow historyDemo sensor · 27 Sep – 12 Oct 2026
Open the live dashboard
Total, 16 days15,955 L
Daily average997 L
Busiest day1,589 LWed 30 Sep
Busiest hour12 pm172 L a day on average
Peak flow70 L/min
Daily consumptionlitres per day
Usage by time of dayaverage litres in each hour
One ordinary day — Sunday 11 Octlitres in each 20-minute slot
Short bursts with nothing in between: this is what a line with no leak looks like.
Leak detection
Every leak leaves a pattern.
We check every monitoring point for these four patterns, round the clock. When one shows up, you hear from us with the point, the time and how much is flowing.
01
Flow never stops
Healthy lines drop to zero between uses. If yours never does, something is always running.
02
Water at night
Steady flow between 1 and 5 am, when nobody should be using water, points to a hidden leak.
03
A run that’s too long
Hours of non-stop flow: an overflowing tank, a burst pipe or a tap left open.
04
Main line ≠ all flats
With a sensor on the main line too, the totals must match. A gap means water lost in shared pipes.
Charts in this section are illustrations of each pattern.
Simple pricing
₹3,000 per point. That’s it.
One monitoring point is one brass flow sensor — supplied, fitted and installed. The dashboard and maintenance cost ₹1,000 a year per building, however many points you have.
- Sensor + fitting + installation included
- Live dashboard, monthly report and bill split
- Leak and unusual-flow alerts
Monitoring pointsOne per room, flat, floor or tank line
BuildingsDashboard & maintenance is per building
One-time₹24,0008 × ₹3,000
Every year₹1,0001 building × ₹1,000
Example from our brochure: an 8-flat building with every flat metered is ₹24,000 once, plus ₹1,000 a year.
Getting started
Book a site visit. Get your quotation.
We check your rooms and water lines, then send a quotation made for your building.
- 01
Call or WhatsApp
Tell us how many rooms and floors you have, and what you’d like to fix first.
- 02
Site visit
We come over, check every room’s switchboard and trace the water lines.
- 03
Quotation
A clear quote for your building: sensors, points, installation and timeline.
- 04
Installed & running
We fit and test everything, set the delays per room, and hand over the dashboard.
FAQ
What PG owners ask us.
Will it switch off the fan while a resident is sleeping?
No. The radar picks up the tiny movement of breathing, so a sleeping or perfectly still person still counts as “in”. That is the main difference from cheap motion-sensor switches.
Is there a camera? What about residents’ privacy?
There is no camera. The sensor uses low-power radio waves only to tell whether the room is occupied. It cannot see faces, take photos or record sound.
Can residents still use the switches?
Yes. The switchboard works exactly as before. The sensor only switches things off after the room has been empty for the delay you choose — 30 to 60 seconds is typical.
What happens if the Wi-Fi goes down?
The sensors talk to the switches over your building’s Wi-Fi. If it goes down, auto-off simply pauses and everything works by hand, as it does today. It resumes when the Wi-Fi is back.
How did you get to “about 27%”?
We took one typical PG room: a 20 W tube and a 70 W fan. The fan runs 8 hours overnight while the resident sleeps, light and fan run 10 hours while someone is in, and both are left on for 6 hours a day with nobody in. That room uses 2.0 units a day; with the sensor, 1.46. The 0.54 units switched off are 27% of the room’s electricity.
Your number depends on how often your rooms sit empty with things on — try the calculator with your own figures.
Can the sensor switch off ACs too?
Yes. In AC rooms it switches the AC off with the lights and fan. At ₹8 a unit, an AC left running two hours a day in an empty room costs about ₹720 a month — that is what the sensor saves.
What does water monitoring cost?
₹3,000 per monitoring point, one-time, covering the brass flow sensor, fitting and installation. Then ₹1,000 a year per building for the dashboard and maintenance.
Can I bill residents for the water they use?
Yes — that is one of the main reasons owners meter each room or flat. The monthly report shows litres per monitoring point, ready for a fair bill split.
Get a quote
Tell us about your PG.
Send it on WhatsApp — we’ll call back to fix a site visit and send a quotation for your building.
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