Arduino + GP2Y1010AU0F 颗粒传感器 测PM2.5

夏普GP2Y1010AU0F灰尘传感器价格较便宜，能检测出室内空气中的灰尘和烟尘含量。另外还有韩国SYHITECH生产的DSM501A粉尘传感器也有类似功能。

技术参数

• 电源电压：5-7V
• 工作温度：-10-65摄氏度
• 消耗电流：20mA最大

硬件连接

• Sharp pin 1 (V-LED) => 5V 串联1个150欧姆的电阻（最好在电阻一侧和GND之间再串联一个220uf的电容）
• Sharp pin 2 (LED-GND) => GND
• Sharp pin 3 (LED) => Arduino PIN 2 （开关LED）
• Sharp pin 4 (S-GND) => GND
• Sharp pin 5 (Vo) => Arduino A0 pin （空气质量数据通过电压模拟信号输出）
• Sharp pin 6 (Vcc) => 5V

LED引脚必须调节成1ms的周期，这点在数据表中讨论过。 LED似乎使用的是PNP晶体管来通电，LED引脚必须接收一个较低的电压。

/* Interface to Sharp GP2Y1010AU0F Particle Sensor

Sharp pin 1 (V-LED)   => 5V (connected to 150ohm resister)
Sharp pin 2 (LED-GND) => Arduino GND pin
Sharp pin 3 (LED)     => Arduino pin 2
Sharp pin 4 (S-GND)   => Arduino GND pin
Sharp pin 5 (Vo)      => Arduino A0 pin
Sharp pin 6 (Vcc)     => 5V
*/

int dustPin=0;
int ledPower=2;
int delayTime=280;
int delayTime2=40;
float offTime=9680;
int dustVal=0;
int i=0;
float ppm=0;
char s[32];
float voltage = 0;
float dustdensity = 0;
float ppmpercf = 0;

void setup() {
    Serial.begin(9600);
    pinMode(ledPower,OUTPUT);
    delay(1000); //@Waiting for bootup
    i=0;
    ppm =0;
}

void loop() {
    i=i+1;
    digitalWrite(ledPower,LOW); // power on the LED
    delayMicroseconds(delayTime);
    dustVal=analogRead(dustPin); // read the dust value
    ppm = ppm+dustVal;
    delayMicroseconds(delayTime2);
    digitalWrite(ledPower,HIGH); // turn the LED off
    delayMicroseconds(offTime);
    voltage = ppm/i*0.0049;
    dustdensity = 0.17*voltage-0.1;
    ppmpercf = (voltage-0.0256)*120000;
    if (ppmpercf < 0) ppmpercf = 0;
    if (dustdensity < 0 ) dustdensity = 0;
    if (dustdensity > 0.5) dustdensity = 0.5;
    String dataString = "";
    dataString += dtostrf(voltage, 9, 4, s);
    dataString += ",";
    dataString += dtostrf(dustdensity, 5, 2, s);
    dataString += ",";
    dataString += dtostrf(ppmpercf, 8, 0, s);
    i=0;
    ppm=0;
    Serial.println(dataString);
    delay(1000);
}

结果分析

把传感器和 Ardiuno 连接好后，可以连续打印出传感器的输出电压值。输出电压大小和灰尘含量的曲线入下图：   

  通过电压的波形还可以判断是烟还是尘