The Gravity: Analog Turbidity Sensor for Arduino (SEN0189) is a high-performance sensor designed to detect water turbidity by measuring light transmittance and scattering caused by suspended particles in water. As the concentration of total suspended solids (TSS) increases, the turbidity level rises—allowing this sensor to provide real-time feedback on water quality.
This sensor supports both analog and digital output modes, giving users flexibility based on microcontroller compatibility. With an adjustable threshold in digital mode, it is ideal for a wide range of Arduino-based water monitoring projects.
Key Features
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Dual output modes: Analog (0–4.5V) and Digital (High/Low)
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Adjustable threshold in digital mode via onboard potentiometer
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Fast response time: Less than 500ms
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Detects TSS-based turbidity using light scattering and transmittance
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Compatible with Arduino and Gravity IO Expansion Shields
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Easy to integrate into automated water quality monitoring systems
Applications
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River and stream water quality monitoring
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Wastewater and effluent analysis
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Sediment transport research
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Aquaculture and water purification systems
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Laboratory liquid experiments
Note: The top of the sensor probe is not waterproof—avoid submersion of the entire probe.
Specifications
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Operating Voltage: 5V DC
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Operating Current: Max 40mA
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Response Time: <500ms
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Insulation Resistance: ≥100MΩ
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Analog Output: 0–4.5V
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Digital Output: High/Low level (threshold adjustable)
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Operating Temperature: 5°C ~ 90°C
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Storage Temperature: -10°C ~ 90°C
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Weight: 30g
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Adapter Dimensions: 38mm × 28mm × 10mm (1.5in × 1.1in × 0.4in)
Arduino Project Example
Project: Automatic Water Changing System
Main Components:
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DFRduino UNO R3
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Gravity: IO Expansion Shield for Arduino V7.1
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Gravity: Analog Turbidity Sensor SEN0189
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Analog pH Sensor / Meter Kit
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Digital 5A Relay Module
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12VDC Power Supply, Solenoid Valve, Water Pump, LCD Display Module
This project demonstrates how to use turbidity data to automate water changes in aquariums or hydroponic systems.
Package Includes
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1 × Turbidity Sensor Adapter
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1 × Turbidity Sensor Probe
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1 × Turbidity Sensor Cable
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1 × Gravity Analog Sensor Cable