Grove – Dust Sensor（PPD42NS）細懸浮微粒 pm2.5 粉塵傳感器 seeed原廠

商品說明

Grove Dust Sensor 細懸浮微粒 粉塵感測器 pm2.5 粉塵傳感器

Grove Dust Sensor 粉塵傳感器可以通過在給定的單位時間內，計算羅脈衝佔用時間（LPO時間）來測量空氣中的顆粒物水平，該傳感器可以為您提供可靠的粉塵數據。它可以檢測直徑為1微米的粉塵顆粒。此傳感器使用計數法測試粉塵濃度，測量結果單位為pcs/0.01cf。

Grove Dust Sensor 採用日本製 頂級Shinye 灰塵傳感器，出廠己校正，接線通電後，即可使用。採低功耗節能設計、使用穩定可靠，提供傳感器規格書、Arduino使用範例。

注意

• 請保證傳感器正面朝上。
• 第一次使用前，請保證3分鐘的預熱時間。
• VR1和VR2針腳已經進行預設，請不要調整它們的配置。
• 該粉塵傳感器測量的顆粒大小與PM2.5顆粒大小不同，不能直接用於PM2.5的測量，但顆粒大小相近，可略作參考。

特徵

• 能夠穩定和靈敏的檢測煙草煙霧的濃度和室內的塵埃。
• 使用內置的空氣加熱裝置達到自我吸氣的功能。
• 方便維護，長時間保持高靈敏度。
• 雙通道輸出，分別用於輸出> 1微米和> 2.5um兩個粒子的濃度。
• 更輕巧，安裝方便。

規格參數

出貨清單

• Grove – Dust Sensor（PPD42NS）x1
• Grove連接線 x1

Documents

• Grove – Dust Sensor（PPD42NS）wiki
• Grove_-_Dust_sensor datasheet
• Preface – Getting Started
• Introduction to Grove

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Grove – Dust Sensor（PPD42NS）

This Dust Sensor gives a good indication of the air quality in an environment by measuring the dust concentration. The Particulate Matter level (PM level) in the air is measured by counting the Low Pulse Occupancy time (LPO time) in given time unit. LPO time is proportional to PM concentration. This sensor can provide reliable data for air purifier systems; it is responsive to PM of diameter 1μm.

Specifications

This Dust Sensor gives a good indication of the air quality in an environment by measuring the dust concentration. The Particulate Matter level (PM level) in the air is measured by counting the Low Pulse Occupancy time (LPO time) in given time unit. LPO time is proportional to PM concentration. This sensor can provide reliable data for air purifier systems; it is responsive to PM of diameter 1μm.

Features

• Stable and sensitive detection of not only cigarette smoke but house dust which are indoor asthma triggers.
• Air is self-aspirated with the current of air generation mechanism with a built-in heater.
• Easy maintenance. High sensitivity lasts long term.
• Dual output for the particle size over 1 micron and 2.5 micron (approx).
• More compact and lighter, and easy installation.

Note : In the latest version, output Hi Voltage is changed from 4.0V to 4.5V.

Specification

Specification

Platforms Supported

• Arduino.

Application Ideas

• Air Purifier
• Air Quality Monitor
• Air Conditioner
• Ventilator

Getting Started

Cautions

• Please keep it upright.
• 3 min preheat time is required while using for the first time.
• Arbitrary operation may cause unexpected damage.
• Following widgets (red rectangle marked) is used only for the factory setting. Please DO NOT change the default configuration.

Grove – Help

Following documents help user get started with Grove.

• Preface – Getting Started.
• Introduction to Grove.
• Getting Started on Windows
• Getting Started on Mac OS X

Demos

Here is a demo to show 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. This function only can be achieved by D8, the input capturing pin of ATmega328P, on Arduino/Seeeduino.
Also, you can connect Grove – Dust sensor to Arduino UNO without Base Shield:

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 = 2000;//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 get air quality’s value detected by sensor from PC’s serial port.

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

“lowpulseoccupancy” represents the Low Pulse Occupancy Time(LPO Time) detected in given 30s. Its unit is microseconds.

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

“concentration” is a figure that has a physical meaning. It is calculated from the characteristic graph below by using the LPO time.

Here is a graph of the dust concentration measured in office :

We can see the concentration of dust is very low in the evening, but it is higher in the afternoon. A threshold can be set when the concentration is above a value. Also, if you want to set the sensor more sensitive you can add a fan on the sensor, and add a 10kΩ resistor between the Pin5 and Ground. More information please visit the blog of A.J.