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Grove - Dust Sensor

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Contents

Introduction

This Dust Sensor measures the Particulate Matter level in air by counting the Lo Pulse Occupancy time(LPO time) in given time unit. LPO time is in proportion to PM concentration. This sensor can provide you pretty reliable data for air purifier system because it's still responsive to particulates whose diameter is 1um. Note: This sensor use counting method to test dust concentration but not weight method, and the unit is pcs/L or pcs/0.01cf.

Dust sensor.JPG

Features

  • Highly responsive
  • Reliable
  • ROHS/PEACH compliant

Note: New version updates output Hi Voltage from Approx. over 4.0V change to Approx over 4.5V.

Application Ideas

Cautions

  • Please keep it upright.
  • 3 min preheat time is required when used at the first time.
  • Arbitrary operation may cause unexpected damage.
  • Pins VR1 and VR2 come preset. Please DON'T change the default configuration.


Specification

Items Min Norm Max Unit
VCC 4.75 - 5.25 V
Standby Current Supply - 90 - mA
Detectable range of concentration - 0~28,000 / 0 ~ 8000 - pcs/liter / pcs/0.01cf
Operating Temperature Range 0 - 45 °C
Output Method Negative Logic, Digital output,Hi over 4.0V(Rev.2) Lo: under 0.7V
Detecting the particle diameter >1 um
Dimensions 59(W) × 45(H) × 22(D) [mm]
Humidity Range 95%rh or less


Usage

Here is a demo to show you how to obtain PM concentration data from this Grove - Dust Sensor.

1. Plug the dust sensor into digital port D8 on the Grove - Base Shield. It can only be D8, because the operation of this sensor involves sampling, a function only can be achieved by D8, the capture input pin of Atmage328P, on Arduino/Seeeduino. 
Also you can connect Grove - Dust sensor to Arduino UNO without Base Shield :

Arduino UNO Dust Sensor
5V Red wire
GND Black wire
Digit 8 Yellow wire


2. Copy and paste the demo code below to a new Arduino sketch.

/* Grove - Dust Sensor Demo v1.0
 Interface to Shinyei Model PPD42NS Particle Sensor
 Program by Christopher Nafis 
 Written April 2012
 
 http://www.seeedstudio.com/depot/grove-dust-sensor-p-1050.html
 http://www.sca-shinyei.com/pdf/PPD42NS.pdf
 
 JST Pin 1 (Black Wire)  => Arduino GND
 JST Pin 3 (Red wire)    => Arduino 5VDC
 JST Pin 4 (Yellow wire) => Arduino Digital Pin 8
 */

int pin = 8;
unsigned long duration;
unsigned long starttime;
unsigned long sampletime_ms = 30000;//sampe 30s ;
unsigned long lowpulseoccupancy = 0;
float ratio = 0;
float concentration = 0;

void setup() {
  Serial.begin(9600);
  pinMode(8,INPUT);
  starttime = millis();//get the current time;
}

void loop() {
  duration = pulseIn(pin, LOW);
  lowpulseoccupancy = lowpulseoccupancy+duration;

  if ((millis()-starttime) > sampletime_ms)//if the sampel time == 30s
  {
    ratio = lowpulseoccupancy/(sampletime_ms*10.0);  // Integer percentage 0=>100
    concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
    Serial.print("concentration = ");
    Serial.print(concentration);
    Serial.println(" pcs/0.01cf");
    Serial.println("\n");
    lowpulseoccupancy = 0;
    starttime = millis();
  }
}

In this program, the seeeduino samples the total duration of "logic low" in 30s, and this duration illustrates the dust density of environment. Open serial monitor, we can read air quality's value detected by sensor from pc serial port.

Dust sensor 1.png

The result above consists of three parts: lowpulseoccupancy, ratio and concentration.

"lowpulseoccupancy" represents the Lo Pulse Occupancy Time(LPO Time) detected in given 30s. Its unit is microsecond.

"ratio" reflects on which level LPO Time takes up the whole sample time.

"concentration" is a figure that has physical meaning. It's calculated from the characteristic graph below by using the LPO time.
Characteristics.jpg

Here is a figure we tested dust concentration in office :

Dust sensor 4.jpg
We can see the concentration of dust is very low in the evening, but it's higher in the afternoon. Maybe you can set a threshold value while the concentration is beyond a value. Also, if you wanna set the sensor more sensitive you can add a fan on the sensor, and add a 10k resistor between the Pin5 and Ground. More information please visit the blog of A.J.

Resources

Grove_-_Dust_sensor datasheet
De-construction of the Shinyei PPD42NS dust sensor Made by Tracy Allen

Reference

Building a low-cost networked PM2.5 monitor -- Made by A.J.
Measuring the Pickle Jr. – a modified PPD42 with an attached fan. -- Made by A.J.
Testing the Shinyei PPD42NS -- Made by darell tan
Air Quality Monitoring -- Made by Chris Nafis

Support

If you have questions or other better design ideas, you can go to our forum or wish to discuss.

Related Projects

If you want to make some awesome projects by Dust Sensor, here's some projects for reference.

Air Quality Box

Overview0.png

This is an IoT demo make by Seeeduino and Grove.

More and More concern are being paid to the environmental air quality nowadays because the tiny granule in the around air can badly endanger people’s health. We always get the information of environment from our government department. But it’s the average value of the whole city / section. It can’t reflect the situation near by you accurately.


I want to make it.



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