Non-contact Optical Turbidity Sensor/ Transmitter Arduino Wiki - DFRobot

Introduction

This non-contact turbidity sensor detects water quality by measuring the level of turbidity. Based on optics principle, it is capable of detecting light transmittance and scattering rate of the liquid in transparent cylinder containers with a diameter of 40-50mm, which then will be output as an analog value within a certain range that reflects the level of liquid turbidity.
The turbidity sensor comes with two infrared probes, which should be oppositely installed on a container. And it starts to detect when the liquid level inside is higher than the two probes. The sensor can do measuring without contacting liquid, thus means less prone to damage caused by water or chemical corrosion.

Specification

• Operating Voltage: 5V

• Operating Current: <10mA(Max)

• Response Time: <1s (VDD=5V Ta=25℃)

• Operating Temperature: 5-60℃

• Storage Temperature: 0-65℃

• Service Life: 50000h (VDD=5V Ta=25℃)

• Communication Mode: TTL

  1.Baud rate: 9600

  2.Data bit: 8bit

  3.Parity bit: none

  4.Stop bit: 1bit

Communication Protocol

Connection Diagram

The sensor communicates with MCU via TTL and transmits the data through serial port after detecting different turbidity data.

Sensor Wiring Sequence Definition

Black=GND Blue=TX Red=VCC White=RX

Recommended connection diagram

Here we connect the sensor to the UNO board using Gravity: 4Pin Sensor Adapter and Gravity-4P Cable (PH2.0 to 2.54 DuPont female). The connections are as shown in the table below.

Installation

The two probes should be oppositely fixed on a transparent container.

Tutorial

Hardware

• DFRduino UNO R3 (or similar) × 1
• Turbidity Sensor × 1
• Gravity: 4Pin Sensor Adapter × 1
• Micro USB Cable × 1
• Gravity-4P Cable (PH2.0 to 2.54 DuPont female) × 1

Software

• Arduino IDE

Sample Code

#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); // RX, TX
unsigned char str[5] = { }; //Serial receives data
unsigned char col;
unsigned int distance = 0;
unsigned char a[5] = {
  0x18,0x05, 0x00, 0x01 ,0x0D
};
void setup()
{
  Serial.begin(9600);
  mySerial.begin(9600);
}
void loop() {
  mySerial.write(a, 5);
  while (!mySerial.available());
  while (mySerial.available() > 0) //Detect if there is data on serial port 
  {
      for (int i = 0; i < 5; i++)
      {
        str[i]=mySerial.read();
        delay(5);
      }
      Serial.println(str[3],DEC);
      mySerial.flush();
  } 
  delay(500);
}

FAQ

1. How does the sensor output reflect the liquid turbidity?

The relation between the sensor output and turbidity is shown as the curve below.

For any other questions, advice or cool ideas to share, please visit the DFRobot Forum.

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