Automated Water Management System (IoT)
- IoT
- Systems Design
In Progress · Arduino/Embedded C++, Sensors (Float/Flow), Relays & Drivers, Solar + Battery Telemetry
Executive Overview
Core Problem
Manual water pump operation causes severe waste: tanks overflow, pumps run dry causing motor burnouts, and power interruptions leave systems in indeterminate states. Furthermore, fluid turbulence inside tanks creates noisy sensor signals, causing rapid relay chatter that destroys electrical contactors.
Architectural Solution
Designed an autonomous edge controller running embedded C/C++ firmware on an ATmega/ESP32 platform with hardware watchdog timer recovery, digital sensor debounce filtering, and fail-safe normally-open relay switching. Engineered low-power sleep routines paired with solar charge telemetry for off-grid resilience.
Measurable Impact
Completely eliminated water overflow incidents, protected pump motors from dry-run burnouts with automatic shut-off heuristics, and established a scalable hardware blueprint for remote environmental automation.
System Architecture
Component topology, protocol boundaries, and data flow.
Reliability & Production Security
Deployment & Infrastructure
What I Learned
Technical trade-offs, battle-tested discoveries, and operational takeaways from this project.
Hardware Fail-Safe Defaults Trump Software Logic
In electro-mechanical systems, physical fail-safes are paramount. Wiring pump relays in a normally-open configuration ensures that if the microcontroller loses power or crashes, the pump physically turns OFF rather than pumping continuously.
Fluid Dynamics Demand Aggressive Digital Debouncing
Water entering a tank sloshes violently, causing float sensors to toggle erratically 20 times per second. Implementing rolling-window averaging and requiring stable readings for 5 continuous seconds prevents relay chatter and contactor destruction.
Hardware Watchdogs Are Essential in Unattended Environments
Electrostatic discharge from nearby electric motors can freeze microcontroller instruction pointers. Enabling a hardware watchdog timer that triggers an automatic hardware reset if the main loop stalls guarantees autonomous recovery.
Optically Isolate Inductive Loads from Logic Circuits
Switching AC water pumps creates massive inductive voltage spikes (back-EMF) that travel back into logic rails. Optical isolators and flyback diodes are mandatory to prevent microcontroller resets.
Future Roadmap & Architectural Evolution
- →Design a consolidated custom PCB integrating sensor inputs, charge controller, and ESP32/LoRa wireless transceiver.
- →Establish an MQTT telemetry pipeline connecting edge nodes to cloud dashboards for live status tracking and alert notifications.