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// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
#include "DHT.h"
// CONFIGURATION
// DHT PINS
#define DHTPIN 4 // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14
// Uncomment whatever type you're using
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT11 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// DSM PINS
#define DSM501 18 // Just leave it as is
// END PIN CONFIGURATION SECTION
// SOME VARS
unsigned long duration;
unsigned long starttime;
unsigned long endtime;
unsigned long sampletime_ms = 1000;
unsigned long lowpulseoccupancy = 0;
float ratio = 0;
float concentration = 0;
uint32_t delayMS = 1000; // in loop delay() explicited
// Initialize DHT Sensor. The current DHT reading algorithm adjusts itself to work on faster procs. (rtfm --> docs)
DHT dht(DHTPIN, DHTTYPE);
void setup() { // Setup code that gets run regardless
Serial.begin(9600);
Serial.println(F("----- DHT + MQ + DSM Interface -----"));
dht.begin(); // Begin DHT System at startup
pinMode(DSM501,INPUT); // Initialize DSM501A Sensor
starttime = millis();
}
void loop() { // Main code
// Wait a few seconds between measurements.
delay(delayMS);
// vvv DHT MEASUREMENTS SECTION vvv //
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.print(F("°C "));
Serial.print(f);
Serial.print(F("°F Heat index: "));
Serial.print(hic);
Serial.print(F("°C "));
Serial.print(hif);
Serial.println(F("°F"));
// vvv MQ135 MEASUREMENTS SECTION vvv //
Serial.println(analogRead(15)); // MQ135 Sensor - ppm metrics (raw)
Serial.println("ppm")
// vvv DSM501A MEASUREMENTS SECTION vvv //
duration = pulseIn(DSM501, LOW);
lowpulseoccupancy += duration;
endtime = millis();
ratio = (lowpulseoccupancy-endtime+starttime + sampletime_ms)/(sampletime_ms*10.0);
concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // idk what s going on in here anymore.. it used to work, it doesn t now..
// concentration = 0.001915 * pow(low_ratio, 2) + 0.09522 * low_ratio - 0.04884;
Serial.print("lowpulseoccupancy: ");
Serial.print(lowpulseoccupancy);
Serial.print(" ratio: ");
Serial.print(ratio);
Serial.print(" DSM501A: ");
Serial.println(concentration);
lowpulseoccupancy = 0;
starttime = millis();
}
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