SmartGhar — Open Source Smart Home Innovation

TankSync, now

Low water. Overhead tank is at 25%. Time to switch on the motor.

Works without the internet

Solar charging

TankSync, now

Tank full. Switch off the motor before it overflows.

by SmartGhar

Know before it overflows. Know before it runs dry.

TankSync hub with its 1.69 inch screen showing a tank at 72 percent

Main unit shown as a render

Every tank in a house, a housing society or a factory, on one screen and on your phone. It keeps working when the internet doesn't, and there's no subscription.

Shop TankSync See how it works

Example readings

Know when to run the motor.

Alerts at low, almost empty and full, on the hub's buzzer and on your phone. Set quiet hours and the buzzer stays silent at night.

78%

Normal

780 of 1,000 L

The tank

6:42

Tuesday 14 October

TankSyncnow

Low water. Overhead tank is at 25%. Time to switch on the motor.

TankSyncnow

Almost empty. Overhead tank is at 10%.

TankSyncnow

Tank full. Overhead tank is at 98%. Switch off the motor before it overflows.

On your phone

Every tank

The TankSync hub with its 1.69 inch screen showing an overhead tank at 76 percent

every building

The hub lives in your home. Its 1.69 inch screen shows every tank, in percent and in litres.

One hub for up to 6 tanks, in any building.

Lite suits a house of 1 or 2 floors. LoRa reaches 3 floors or more, a tower, or a tank in another block.

TankSync hub with the 1.69 inch screen — The hub 1.69 inch screen

TankSync hub with the 1.28 inch round screen, render — Or the round hub 1.28 inch screen, you choose at checkout

A real TankSync install on a rooftop tank — Modular kit for roof tanks and underground sumps, real install

App history graph — On your phone the app

The TankSync Standard unit, one sealed unit with the sensor on top, render — Standard kit for rooftop tanks in the sun

The Standard unit's built-in ultrasonic sensor sending a pulse, render — Sensor built in Standard kit

Independent housesHousing societiesHigh-rise towersFlatsBuilder floorsCommercial complexesHotelsSchoolsFactoriesOfficesShopsFarmhousesTerrace tanksUnderground sumpsHome Assistant setups

For societies, towers and campuses

Many tanks. Many floors. One screen.

Housing societies, high-rise towers, commercial complexes, hotels, schools and factories keep tanks on roofs and in sumps, often in different blocks. TankSync brings them onto one hub and into the app.

Up to 6 tanks on one hubRoof tanks and sumps across blocks, on one screen.
LoRa up to about 1 kmIn clear line of sight. Walls and floors in between shorten it.
MQTT and REST APIEvery reading goes out live, ready for your building dashboard or Home Assistant.
mmWave radar upgradeA sealed, no contact sensor. Nothing touches the water.

Up to about 1 km in clear line of sight

One hub, in the office

Drawing not to scale. Example levels.

mmWave radar on this tank

MQTT example feed

6 tanks per hub
LoRa about 1 km
MQTT and REST API
mmWave radar upgrade

Built for rooftop sun and monsoon.

A sealed lid, a coated board and sealed cable glands.

LoRa antenna housingFor the pre-certified RYLR998 module, on LoRa builds

Sealed lidWith the TankSync emboss

Main boardConformal-coated against damp

Sealed cable glandsFor the sensor and solar cables

LoRa antenna housingFor the pre-certified RYLR998 module, on LoRa builds
Sealed lidWith the TankSync emboss
Main boardConformal-coated against damp
Sealed cable glandsFor the sensor and solar cables

Render

Example readings

The internet went down. Your water level didn't.

Readings travel by radio from the tank to the hub, so the hub keeps showing the level and sounding alerts with the router off. When the connection is back, the app shows the latest level again.

Internet on

TankSync main unit on the tank, render — On the tank

LoRa radioLoRa

Wi-Fi

Your router

Internet

TankSync appnow

Overhead tank 64%. Updated just now.

Your phone

Example data

On the hub, on your phone and in Home Assistant.

The same tank, the same reading, in all three places. Move along the graph to see the level at any moment of the day.

Overhead Tanknow

64%

640 of 1,000 L

Now · 64%

In the app

Overhead tankDraining640 / 1,000 L 3.98 V-71 dBmSolar

SumpSteady800 / 2,000 L 3.57 V-69 dBmUSB

Total 1,440 / 3,000 L (48%)2 of 2 onlinePump off

In Home Assistant

Set up in three steps.

The tank unit sends its readings to the hub by radio, so no cable runs from the roof to the house.

Sensor through the lidOne hole in the tank lid, locked with two nuts.
Main unit in the shadeOn a wall, the tank side or the lid, with screws or tape.
Panel in the sunScrews, zip ties or outdoor tape, on its 1 m cable.

Then two numbers in the app

Distance at full is from the sensor down to the water when the tank is full. Distance at empty is down to the bottom. Keep at least 25 cm between the sensor and full water.

Readings are accurate to ±5 cm.

Modular or Standard. Pick the one that fits your tank.

Modular puts each part where it works best. Standard combines the sensor, battery and solar panel in one sealed unit. Both start at ₹6,490, and kits are delivered in the first week of December 2026.

Roof tanks and underground sumps

Modular kit

Three parts on cables, each where it works best
Solar panel on a 1 m cable, USB cable for shade
Lite or LoRa radio
1.28 inch round or 1.69 inch hub screen

From ₹6,490

Choose Modular

Standard unit with its built-in sensor, render

Rooftop tanks in the sun

Standard kit

One sealed unit on the tank lid
Sensor, battery and solar panel built in
No cables to route
Gray, with the round or 1.69 inch hub

From ₹6,490

Choose Standard

SmartGhar

TankSync is the first. More is coming.

Smart-home hardware that keeps working when the internet doesn't, with no subscriptions. The next products are in development, and each is planned to work with Home Assistant, like TankSync.