Test Code:<\/strong><\/p>\n

#include<string.h>
\nbyte buff[2];
\nint pin = 8;\/\/DSM501A input D8
\nunsigned long duration;
\nunsigned long starttime;
\nunsigned long endtime;
\nunsigned long sampletime_ms = 30000;
\nunsigned long lowpulseoccupancy = 0;
\nfloat ratio = 0;
\nfloat concentration = 0;<\/p>\n

int i=0;
\nvoid setup()
\n{
\nSerial.begin(9600);
\npinMode(8,INPUT);
\nstarttime = millis();
\n}
\nvoid loop()
\n{<\/p>\n

duration = pulseIn(pin, LOW);
\nlowpulseoccupancy += duration;
\nendtime = millis();
\nif ((endtime-starttime) > sampletime_ms)
\n{
\nratio = (lowpulseoccupancy-endtime+starttime + sampletime_ms)\/(sampletime_ms*10.0);\u00a0 \/\/ Integer percentage 0=>100
\nconcentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; \/\/ using spec sheet curve
\nSerial.print(“lowpulseoccupancy:”);
\nSerial.print(lowpulseoccupancy);
\nSerial.print(“\\n”);
\nSerial.print(“ratio:”);
\nSerial.print(“\\n”);
\nSerial.print(ratio);
\nSerial.print(“DSM501A:”);
\nSerial.println(concentration);
\nSerial.print(“;\\n\\n”);<\/p>\n

lowpulseoccupancy = 0;
\nstarttime = millis();
\n}<\/p>\n

}<\/p>\n","protected":false},"excerpt":{"rendered":"

DSM501A Dust Sensor Module PM 2.5 Detection Dector For Arduino For Air condition DSM501 dust sensor can sense that, tobacco smoke and pollen, house dust, such as heating automatic suction device, adjustable resistance is set up to detect the size of the dust.Using the same as the particle counter principle as the foundation, to detect […]<\/p>\n","protected":false},"featured_media":3264,"comment_status":"open","ping_status":"closed","template":"","meta":{"spay_email":""},"product_cat":[22],"product_tag":[506,505,508,507],"yoast_head":"\n