1.Description:
  It is a turbidity sensor module.This turbidity sensor uses the optical principle to comprehensively judge the turbidity through the light transmittance and scattering rate in the solution.The turbidity sensor module converts the current signal output by the sensor into a voltage signal,and performs AD conversion data processing through a single-chip microcomputer.

2.Feature:
  1).The turbidity sensor module adopts 3Pin XH2.54 connector to connect with the sensor probe,which is convenient to connect.
  2).The liquid turbidity detection module supports two-way signal output on-board 10K adjustable potentiometer,and the digital signal trigger threshold can be adjusted through the knob of the potentiometer.
  3).The turbidity detection module is cheap,easy to use and has high measurement accuracy.
  4).It has a digital signal indicator and a power indicator,and the working state of the turbidity sensor can be observed through the indicator.

3.Parameter:
  1).Product Name:Turbidity Sensor Module
  2).Input Voltage:DC 5V
  3).Working Current:40mA (Max)
  4).Response Time:500ms (Max)
  5).Interface Form:XH2.54-3P
  6).Signal Output:analog:0-5V,digital:high/low level signal
  7).Work Temperature:-25℃~85℃
  8).Work Humidity:5%~95%RH
  9).Module Size:40.8 x 23.9 x10 mm

4.Turbidity Sensor Probe:
  1).Measuring range (NTU):0-1000
  2).Peak infrared emission wavelength:940mm
  3).Peak wavelength of photodiode:880mm
  4).Infrared emitting diode model:EL-23G (KODENSHI)
  5).Photosensitive receiving diode Model:ST-23G (KODENSHI)

5.Principle Introduction:
  1).The inside of the sensor is an infrared pair tube.When the light passes through a certain amount of water,the amount of light transmission depends on the degree of pollution of the water.The more polluted the water,the less light is transmitted.The light receiving end converts the transmitted light intensity into the corresponding current.

  2).This module has analog and digital output interfaces.The analog quantity can be sampled by the single-chip A/D converter to know the current turbidity of the water.The digital quantity can adjust the trigger threshold through the potentiometer on the module.When the turbidity reaches the set threshold,the L1 indicator will be lit.The output of the sensor module changes from high level to low level.The microcontroller monitors the level change,Determine whether the turbidity of the water exceeds the standard,so as to warn or link other equipment.

6.Precautions for Use:
  1).The turbidity sensor is encapsulated in a plastic shell,and the top of the sensor cannot be waterproof.It is forbidden to soak the probe in water when using it;the water surface to be measured cannot exceed the connection between the cover and the shell to avoid damage to the sensor probe.

  2).The measurement part at the bottom of the sensor should be kept clean to avoid the reduction of measurement accuracy or inaccurate measurement due to the adsorption and blocking of pollutants.

  3).The wavelength range of light received by the photodiode of the sensor is 500~1050nm.Fluorescent lamps and ambient light will affect the signal reception of the photosensitive sensor,thereby affecting the measurement accuracy and causing the measurement error to increase;therefore,the turbidity sensor probe should be avoided during measurement.Fluorescent lamps and direct sunlight.

7.Answers to Questions:
  1).Q:What substances can the turbidity sensor measure in water?
      A:The turbidity sensor measures the particulate floating matter in the water environment,such as:sediment,clay,metal particles,organic matter,plankton and microorganisms and other suspended substances;it is not suitable for measuring water quality caused by ink,color and pigment.Pollutes the environment;the way some individual users measure with a few drops of ink mixed with pure water is the wrong solution.

  2).Q:What signal does this sensor output?
      A:The sensor control board supports simultaneous output of analog and digital signals:
     2.1).The AOUT port outputs an analog signal,and the voltage is between 0~4.5V;the analog signal can be programmed and controlled by the corresponding voltage signal after being collected by the microcontroller AD,or the corresponding data can be read by the analog input pin of the Arduino controller.control.

    2.2).The DOUT port outputs digital high and low level signals,the high level is 1 (about 4.5V),and the low level is 0 (about 0.28V);the digital quantity can directly collect high and low level signals through the MCU pins At the same time,the digital quantity can also be separated from the MCU programming,and a 5V relay module can be directly connected to control external equipment;the digital signal trigger sensitivity can be set through the on-board adjustable resistor to set the turbidity threshold;the sensitivity can be adjusted counterclockwise to increase ,the sensitivity becomes lower if you adjust it clockwise.

  3).Q:How does the voltage of the analog signal output by the sensor change?
      A:Measured in the indoor natural light environment,the voltage value of the analog signal output by the sensor in clean water is about 3.9V.When the turbidity of the water increases,the output voltage changes from high to low,and the lowest value is close to 0V.

  4).Q:Why is the output voltage of the analog signal lower when the sensor is not in contact with water,but higher when it is in clean water?
      A:This is determined by the hardware characteristics of the sensor.The photoelectric infrared through-beam sensor is used.In the natural environment,the ambient light affects the transmission of the infrared light signal;while in clean water,the output voltage becomes higher,because the water It increases the refraction of infrared light,but helps the transmission of infrared light;so when we set the corresponding value,we should take the corresponding value in clear water and turbid water,not from the natural environment when the probe is not in contact with water.value.

  5).Q:What is the working voltage of the sensor?
      A:The working voltage of the sensor control board is 5V,and the maximum can not exceed 6V,otherwise the module and sensor probe will be burned out.

8.Application:
  1).Washing machine
  2).Dishwasher
  3).Industrial field control
  4).Environmental sewage collection

9.Package:
  1).1pcs Turbidity Sensor Module
  2).1pcs Turbidity Sensor Probe
  3).1pcs Cable