// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain

// 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"

#define DHTPIN 2     // Digital pin connected to the DHT sensor
#define _mypin 2     // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)


DHT dht(DHTPIN, DHTTYPE);


uint8_t ourData[5];
uint8_t pullTime;
uint32_t maxcycles, _lastreadtime;
bool _lastresult;

// Define TIMEOUT constant if not already defined
#define MIN_INTERVAL 2000 /**< min interval value */
#define TIMEOUT UINT32_MAX

// Function to simulate expectPulse behavior
uint32_t expectPulse(bool level) {
   uint32_t count = 0;

  while (digitalRead(_mypin) == level) {
    if (count++ >= maxcycles) {
      return TIMEOUT; // Exceeded timeout, fail.
    }
  }
  return count;
}


void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));

  pinMode(_mypin, INPUT_PULLUP);
  _lastreadtime = millis() - MIN_INTERVAL;
  pullTime = 55;
  maxcycles = microsecondsToClockCycles(1000);

  dht.begin();
  // Reset 40 bits of received data to zero.
}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);

  uint32_t currenttime = millis();
  if (((currenttime - _lastreadtime) < MIN_INTERVAL)) {
    return _lastresult; // return last correct measurement
  }
  _lastreadtime = currenttime;

  ourData[0] = ourData[1] = ourData[2] = ourData[3] = ourData[4] = 0;
  pinMode(_mypin, INPUT_PULLUP);
  delay(1);

  // First set data line low for a period according to sensor type
  pinMode(_mypin, OUTPUT);
  digitalWrite(_mypin, LOW);
  delayMicroseconds(1100);

  uint32_t ourCycles[80];
  {
    pinMode(_mypin, INPUT_PULLUP);
    delayMicroseconds(pullTime);

     if (expectPulse(LOW) == TIMEOUT) {
      _lastresult = false;
      return _lastresult;
    }
    if (expectPulse(HIGH) == TIMEOUT) {
      _lastresult = false;
      return _lastresult;
    }

    //InterruptLock lock;

    for (int i = 0; i < 80; i += 2) {
      ourCycles[i] = expectPulse(LOW);
      ourCycles[i + 1] = expectPulse(HIGH);
    }
  } // Timing critical code is now complete.

  // Inspect pulses and determine which ones are 0 (high state cycle count < low
  // state cycle count), or 1 (high state cycle count > low state cycle count).
  for (int i = 0; i < 40; ++i) {
    uint32_t lowCycles = ourCycles[2 * i];
    uint32_t highCycles = ourCycles[2 * i + 1];
    
    ourData[i / 8] <<= 1;
    // Now compare the low and high cycle times to see if the bit is a 0 or 1.
    if (highCycles > lowCycles) {
      // High cycles are greater than 50us low cycle count, must be a 1.
      ourData[i / 8] |= 1;
    }
  }

  if (ourData[4] == ((ourData[0] + ourData[1] + ourData[2] + ourData[3]) & 0xFF)) {
    Serial.print(F("Checksum Okay"));
  } else {
    Serial.print(F("Checksum Not Okay"));
  }

  float ourValue = NAN;

  ourValue = ((word)(ourData[2] & 0x7F)) << 8 | ourData[3];
  ourValue *= 0.1;
  if (ourData[2] & 0x80) {
    ourValue *= -1;
  }

  Serial.print(F("Temperatur: "));
  Serial.print(ourValue);








































  // 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.println(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"));
}