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#include <MQ135.h>
#include <DHT.h>
/* MQ135 + DHT Temp Sensor
Combination of the MQ135 air quality sensor and a DHT11/22 temperature sensor to accurately measure ppm values through the library correction.
Uses the Adafruit DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
Written by: https://github.com/NuclearPhoenixx/MQ135
*/
#define PIN_MQ135 15 // MQ135 Analog Input Pin
#define DHTPIN 23 // DHT Digital Input Pin
#define DHTTYPE DHT11 // DHT11 or DHT22, depends on your sensor
MQ135 mq135_sensor(PIN_MQ135);
DHT dht(DHTPIN, DHTTYPE);
float temperature, humidity; // Temp and Humid floats, will be measured by the DHT
void setup() {
Serial.begin(9600);
dht.begin();
}
void loop() {
// Serial.println("aaaaaaaaaaaaaaaaaa");
humidity = dht.readHumidity();
temperature = dht.readTemperature();
// Check if any reads failed and exit early (to try again).
if (isnan(humidity) || isnan(temperature)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
float rzero = mq135_sensor.getRZero();
float correctedRZero = mq135_sensor.getCorrectedRZero(temperature, humidity);
float resistance = mq135_sensor.getResistance();
float ppm = mq135_sensor.getPPM();
float correctedPPM = mq135_sensor.getCorrectedPPM(temperature, humidity);
Serial.print("MQ135 RZero: ");
Serial.print(rzero);
Serial.print("\t Corrected RZero: ");
Serial.print(correctedRZero);
Serial.print("\t Resistance: ");
Serial.print(resistance);
Serial.print("\t PPM: ");
Serial.print(ppm);
Serial.print("ppm");
Serial.print("\t Corrected PPM: ");
Serial.print(correctedPPM);
Serial.println("ppm");
delay(300);
}
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