Motion-Activated Water-Saving Faucet Design

I want to retrofit the faucets in my sinks so that the water starts and stops automatically, cutting waste every time someone washes their hands. My idea is to mount motion sensors near the faucet handle; when a hand approaches, the valve opens and, once no movement is detected, a built-in timer shuts the flow after a short delay for rinsing.

Here’s what I need from you:

• An electronics solution built around motion sensors positioned at the handle area, with a timer-based automatic shut-off.
• A clear wiring diagram, component list and recommended suppliers.
• Microcontroller or off-the-shelf control module code/firmware that handles motion detection, debounce, and the adjustable shut-off timer.
• Mechanical integration details—housing or bracket concepts that keep the sensor dry yet responsive and can be 3-D printed or machined.
• An installation and calibration guide that a non-specialist can follow.

I’ll test the design on a single sink first and, if the prototype meets the brief (reliable activation, no false triggers, smooth shut-off, and obvious water savings), I plan to roll it out to several more units.