#include <Arduino.h>
#include "DHT_Async.h"

/* Uncomment according to your sensortype. */
//#define DHT_SENSOR_TYPE DHT_TYPE_11
//#define DHT_SENSOR_TYPE DHT_TYPE_21
#define DHT_SENSOR_TYPE DHT_TYPE_22

static const int DHT_SENSOR_PIN = 12;
DHT_Async dht_sensor(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);


/*
 * Initialize the serial port.
 */
void setup() {
    Serial.begin(115200);
}


/*
 * Poll for a measurement, keeping the state machine alive.  Returns
 * true if a measurement is available.
 */
static bool measure_environment(float *temperature, float *humidity) {
    static unsigned long measurement_timestamp = millis();

    /* Measure once every four seconds. */
    if (millis() - measurement_timestamp > 4000ul) {
        if (dht_sensor.measure(temperature, humidity)) {
            measurement_timestamp = millis();
            return (true);
        }
    }

    return (false);
}


/*
 * Main program loop.
 */
void loop() {
    float temperature;
    float humidity;

    /* Measure temperature and humidity.  If the functions returns
       true, then a measurement is available. */
    if (measure_environment(&temperature, &humidity)) {
        Serial.print("T = ");
        Serial.print(temperature, 1);
        Serial.print(" deg. C, H = ");
        Serial.print(humidity, 1);
        Serial.println("%");
    }
}