2018年10月25日 (四) 12:53的版本

1 Overview

• Detectable range of concentration 0~28,000 / 0 ~ 8000 pcs/liter / pcs/0.01cf
• Detecting the particle diameter >1μm
• Output: Negative Logic, Digital output, High: over 4.0V(Rev.2), Low: under 0.7V

• Weight 28g
• VCC 4.75~5.75V
• Standby Current Supply 90mA
• Dimensions 59(W) × 45(H) × 22(D) mm

2 Example code

/*
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
  {
    // Integer percentage 0=>100
    ratio = lowpulseoccupancy / (sampletime_ms * 10.0);

    // using spec sheet curve
    concentration = 1.1 * pow(ratio, 3) - 3.8 * pow(ratio, 2) + 520 * ratio + 0.62;

    Serial.print("concentration = ");
    Serial.print(concentration);
    Serial.println(" pcs/0.01cf, LowPulsOccu = ");
    Serial.print(lowpulseoccupancy);
    Serial.print(", Ratio = ");
    Serial.println(ratio);

    lowpulseoccupancy = 0;
    starttime = millis();
  }
}

3 Output

4 Reference

• http://wiki.seeedstudio.com/Grove-Dust_Sensor/
• https://seeeddoc.github.io/Grove-Dust_Sensor/
• PPD42NS Datasheet