PPD42NS
来自Jack's Lab
目录 |
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 = 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); // return us 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
- https://indiaairquality.com/2014/09/28/building-pickle-the-networked-pm2-5-monitor-part-1/
- http://forum.arduino.cc/index.php?topic=176269.0