KY-015 Combi-Sensor (temperature & humidity)

This sensor is a combination of temperature sensor and humidity sensor, united in a compact design. The disadvantage is the low sampling rate of the measurement, so that only every 2 seconds a new measurement result is available. This sensor is therefore particularly suitable for long-term measurements.

Technical data

Pin assignment

Code example Arduino

Pin assignment Arduino

For the following code example an additional library is needed:

DHT-sensor-library by Adafruit | published under the MIT License.

This sensor does not output its measurement result as an analog signal to an output pin, but communicates it digitally encoded.

The example below uses the mentioned library. Therefore, download the library and unpack it into your Arduino library folder, which by default is located at (C:\User[username]\Documents\Arduino\libraries). Alternatively, it is also included in the download package below.

// Adafruit_DHT library is inserted
#include "DHT.h"
 
// Here the respective input pin can be declared
#define DHTPIN 2     
 
// The sensor is initialized
#define DHTTYPE DHT11 // DHT 11
DHT dht(DHTPIN, DHTTYPE);
 
void setup() 
{
  Serial.begin(9600);
  Serial.println("KY-015 test - temperature and humidity test:");
 
  // Measurement is started
  dht.begin();
}
 
// Main program loop
// The program starts the measurement and reads out the measured values
// There is a pause of 2 seconds between measurements,
// so that a new measurement can be acquired on the next run.
void loop() {
 
  // Two seconds pause between measurements
  delay(2000);
 
  // Humidity is measured
  float h = dht.readHumidity();
  // temperature is measured
  float t = dht.readTemperature();
   
  // Checking if the measurements have passed without errors
  // if an error is detected, a error message is displayed here
  if (isnan(h) || isnan(t)) {
    Serial.println("Error reading the sensor");
    return;
  }
 
  // Output to serial console
  Serial.println("-----------------------------------------------------------");
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(char(186)); //Output <°> symbol
  Serial.println("C ");
  Serial.println("-----------------------------------------------------------");
  Serial.println(" ");
}

Please note that the sensor provides a new measurement result only about every 2 seconds.

Example program download

KY015-Arduino.zip