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Reliable smart water monitoring. Engineered to be reliable, not just smart.
The indoor hub — wall-mounted, 5 V powered, round colour display, fully offline-capable. Cloud is optional.
A solar-powered sensor on the rooftop, a quiet hub on the wall, and smart water monitoring that keeps working even when the internet doesn't. Up to 6 tanks per hub. Reports to your phone via the optional PWA, to Home Assistant via HACS, or to any MQTT broker. Local operation is the default; cloud is opt-in.
Why this matters: most "smart tank" products treat the cloud as the product. TankSync treats reliability as the product. The hub, sensor, local web UI, OLED display, LED ring, buzzer, and Home Assistant integration all work without an account, without an ISP, without us. The cloud, when you opt in, is an enhancement — never a dependency.
The whole system is open at the core — firmware (AGPL-3.0), hardware (CC BY-SA 4.0), schematics, STL cases, BOM, and flashing tools are all in this repository. Self-host it. Fork it. Audit it.
| You want to... | Start here |
|---|---|
| Set up the kit I just bought | Setup — Start Here → Install the Transmitter → Tank Calibration |
| Monitor my tanks from my phone | Connect to Cloud → App Overview |
| Add another tank to an existing hub | Pairing a Transmitter |
| Update my hub's firmware | Updating Firmware |
| Buy a ready-made kit | smartghar.org/tanksync |
| Build one from scratch | Hardware Build → Quick Start |
| Flash an existing board | Quick Start (browser flasher, no toolchain) |
| Add a TankSync hub to Home Assistant | HACS Integration |
| Just understand how it works | How TankSync Works |
| Troubleshoot something | FAQ → Troubleshooting |
Bought a kit? You don't need to flash or pair anything — every system is tested and paired before it ships. Go straight to Setup — Start Here. The "Build it yourself" pages are for people assembling their own boards from the open hardware files.
flowchart LR
TX[TX node<br/>solar + 18650] -->|LoRa| RX[RX hub<br/>5V DC]
RX -->|Wi-Fi + MQTT| App[Phone / HA / dashboard]
- TX — one per tank. Custom circular PCB, PETG enclosure, solar panel, JSN-SR04T ultrasonic sensor. Sleeps between readings; runs years on a single 18650.
- RX — one per property. ESP32 hub on 5 V (DC jack; USB-to-DC cable in the box). Local web UI, OLED, optional LED strip + buzzer, MQTT bridge.
- App — open the PWA in any browser, or wire it into Home Assistant via the HACS integration.
Build → Hardware Build · Bill of Materials · Wiring (Hub) · Wiring (Transmitter)Flash + first boot → Quick Start · Browser Flasher · First BootUse → HACS Integration · PWA Walkthrough · Local Web UIReference → FAQ · Troubleshooting · Firmware Versions
- Firmware — AGPL-3.0
- Hardware (schematics, PCB, STL, BOM) — CC-BY-SA 4.0
- Brand — "TankSync" and "SmartGhar" are trademarks of Ravi Singh / TechPosts Media
You can build it, modify it, and sell it. Derivative firmware must stay open under the AGPL; derivative hardware must stay open under CC-BY-SA. The brand names are reserved.