A River's Tale (Smart Water Pollution TDS & Turbidity Lab)
Source: Stemoto Original
Track a river's journey from clean mountain spring to polluted city river. Use a TDS (Total Dissolved Solids) sensor probe and optical turbidity sensor to test water purity samples, displaying PPM pollution levels.
Categorisation
Props & Materials Required
- •3 water sample jars (Mountain Spring, Village Stream, City Factory River)
- •Analog TDS (Total Dissolved Solids) meter sensor probe
- •TS-300B optical turbidity sensor module
- •ESP32 controller board
- •16x2 LCD display screen
- •DFPlayer Mini MP3 module + 3W speaker
Step-by-Step Instructions
Test Mountain Spring Sample
Insert TDS probe into Mountain Spring sample jar.
Read Pure Water TDS
LCD displays 'TDS: 45 PPM | Turbidity: CLEAR'. Speaker: 'PURE DRINKING WATER! Clean mountain source!'
Test City Factory River Sample
Insert TDS probe into City River sample containing soap/salt contaminants.
Read Polluted Water Warning
LCD displays 'TDS: 850 PPM | Turbidity: MURKY!'. Red LED flashes + Speaker warns: 'HIGH POLLUTION! Industrial waste detected! Unsafe for fish!'
Why It Works & Notes
A River's Tale illustrates how rivers get polluted as they flow past villages and cities. Testing real water samples with digital TDS probes (measuring dissolved salts/chemicals in PPM) makes water quality scientifically measurable.
Looking Around Chapter 13: A River's Tale | STEM Tech: Electro-Conductivity TDS Probing & Optical Turbidity Pollution Telemetry — municipal water quality testing.