#define pin 14       // ESP8266-12E  D5 read emperature and Humidity data
int temp = 0; //temperature
int humi = 0; //humidity
void readTemperatureHumidity();
void uploadTemperatureHumidity();

void setup() {
  Serial.begin(115200);
}

void loop() {
  
readTemperatureHumidity();
delay(4000);

}

//read temperature humidity data
void readTemperatureHumidity(){
  int j;
  unsigned int loopCnt;
  int chr[40] = {0};
  unsigned long time1;
bgn:   
  delay(2000);
  //Set interface mode 2 to: output
  //Output low level 20ms (>18ms)
  //Output high level 40μs
  pinMode(pin, OUTPUT);
  digitalWrite(pin, LOW);
  delay(20);
  digitalWrite(pin, HIGH);
  delayMicroseconds(40);
  digitalWrite(pin, LOW);
  //Set interface mode 2: input
  pinMode(pin, INPUT);
  //High level response signal
  loopCnt = 10000;
  while (digitalRead(pin) != HIGH){
    if (loopCnt-- == 0){
      //If don't return to high level for a long time, output a prompt and start over
      Serial.println("HIGH");
      goto bgn;
    }
  }
  //Low level response signal
  loopCnt = 30000;
  while (digitalRead(pin) != LOW){
    if (loopCnt-- == 0){
      //If don't return low for a long time, output a prompt and start over
      Serial.println("LOW");
      goto bgn;
    }
  }
  //Start reading the value of bit1-40
  for (int i = 0; i < 40; i++){
    while (digitalRead(pin) == LOW){}
    //When the high level occurs, write down the time "time"
    time1 = micros();
    while (digitalRead(pin) == HIGH){}
    //When there is a low level, write down the time and subtract the time just saved
    //If the value obtained is greater than 50μs, it is ‘1’, otherwise it is ‘0’
    //And save it in an array
    if (micros() - time1  > 50){
      chr[i] = 1;
    } else {
      chr[i] = 0;
    }
  }

  //Humidity, 8-bit bit, converted to a value
  humi = chr[0] * 128 + chr[1] * 64 + chr[2] * 32 + chr[3] * 16 + chr[4] * 8 + chr[5] * 4 + chr[6] * 2 + chr[7];
  //Temperature, 8-bit bit, converted to a value
  temp = chr[16] * 128 + chr[17] * 64 + chr[18] * 32 + chr[19] * 16 + chr[20] * 8 + chr[21] * 4 + chr[22] * 2 + chr[23];

    Serial.print("temp:");
    Serial.print(temp);
    Serial.print("    humi:");
    Serial.println(humi);

}