Humidity Sensor DH11

How it works

How to connect to ESP-01

How to program it

The following code can be found at dh11.cpp.

#include <dht11.h>

dht11 DHT;
// Pin 4 of Arduino to Data of DHT11
#define DHT11_PIN 4

void setup() {
  Serial.begin(9600);
  int check;
  Serial.print(“DHT11 STATUS – \t”);
  check = DHT.read(DHT11_PIN);
  // check status
  switch (check) {
  case DHTLIB_OK:
    Serial.print(“OK\n”);
    break;
  case DHTLIB_ERROR_CHECKSUM:
    Serial.print(“Checksum error \n”);
    break;
  case DHTLIB_ERROR_TIMEOUT:
    Serial.print(“Timeout error \n”);
    break;
  default:
    Serial.print(“Unknown error \n”);
    break;
  }
}

void loop() {

  // humidity and temperature output
  Serial.print(“Humidity is “);
  Serial.print(DHT.humidity, 1);
  Serial.print(“\n”);
  Serial.println(“Temperature is “);
  Serial.println(DHT.temperature, 1);

  delay(1000);
}