Water-quality monitoring is a useful example of how web development can connect data with real-world systems.

A dashboard can display measurements such as pH and water temperature, show the time of the latest reading, and flag values that need review.

In this tutorial, we will build a small front-end prototype using HTML and JavaScript. The example uses simulated readings, not real sensors.

What are we building?

Our dashboard will:

Display a pH reading.

Display a water-temperature reading.

Show when the readings were updated.

Reject invalid sensor values.

Indicate when a reading falls outside configurable example limits.

Important: The example limits below are for demonstrating software logic only.…