Smart PCB Water Leak Detector

I need a compact yet powerful PCB that listens for underground water-burst signatures (1-3 m deep) with a piezo-disc ground microphone, analyses the acoustic and vibration data in real time, and flags the exact leak point for plumbers in homes and commercial buildings. The board must fuse the piezo signals with any additional digital sensors you find useful, then feed the processed data to an external app or logger.

Wireless connectivity is helpful but not mandatory—feel free to factor in Wi-Fi, Bluetooth, Zigbee, or even leave the radio out if it simplifies the first revision. Likewise, an onboard screen is optional; the design just needs clear expansion headers so we can snap in a small OLED or route data out over UART/SPI/I²C. The real priority is clean sensor front-ends, low-noise amplification, robust DSP/FFT routines, and smart firmware that can filter out environmental rumble while amplifying that tell-tale burst sound.

If you prefer an STM32, ESP32, or another MCU/DSP, I’m flexible as long as it handles multi-channel sampling and future OTA updates. Good power management is essential because the unit may run on battery during field tests. A modular approach—separate analog front-end, MCU core, and plug-and-play sensor daughter cards—will make future temperature, pressure, or humidity add-ons painless.

Deliverables
• Complete schematic and PCB layout (KiCad or Altium)
• Annotated firmware source with DSP routines and leak-detection logic
• BOM with real-world part numbers and indicative lead times
• Prototype build files (Gerbers, pick-and-place, 3-D views)
• Basic test plan showing leak simulation at 1–3 m depth and performance metrics

Acceptance
The assembled prototype must discern a pressurised pipe burst from background noise in a controlled test trench, log the peak event, and stream or store the raw plus filtered data for validation. Once this proof-of-concept is confirmed, we’ll discuss an enclosure and production optimisation.