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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); 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(lowpulseoccupancy); Serial.print("concentration = "); Serial.print(concentration); Serial.println(" pcs/0.01cf"); Serial.println("\n"); lowpulseoccupancy = 0; starttime = millis(); } }
时间百分比与浓度关系.png (43.68 KB, 下载次数: 51)
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