How to Use KY-015 DHT11 Temperature-Humidity sensor module: Examples, Pinouts, and Specs

The KY-015 DHT11 Temperature-Humidity Sensor Module is a versatile and easy-to-use sensor that measures both temperature and humidity. It utilizes the DHT11 sensor to provide digital output of the temperature and humidity readings, making it straightforward to interface with microcontrollers such as the Arduino UNO. This module is widely used in weather stations, environmental monitoring systems, and home automation projects.

1. Power Supply: Connect the VCC pin to a 3.3V or 5V power supply.
2. Ground: Connect the GND pin to the ground of the power supply.
3. Data Signal: Connect the DATA pin to a digital input pin on the microcontroller (e.g., Arduino UNO).

KY-015 DHT11 Module
-------------------
   VCC  ->  5V (Arduino)
   DATA ->  Digital Pin 2 (Arduino)
   GND  ->  GND (Arduino)

• Ensure the sensor is placed in an environment within its operating range (0°C to 50°C and 20% to 90% RH).
• Avoid placing the sensor in direct sunlight or near heat sources to prevent inaccurate readings.
• Allow the sensor to stabilize for a few seconds after powering up before taking readings.

#include <DHT.h>

#define DHTPIN 2     // Digital pin connected to the DHT11 sensor
#define DHTTYPE DHT11   // DHT11 sensor type

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
}

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

  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if any reads failed and exit early (to try again).
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C");
}

1. No Data Output: Ensure all connections are secure and the sensor is powered correctly.
2. Inaccurate Readings: Check the environment for factors that might affect the sensor, such as direct sunlight or heat sources.
3. Failed to Read from Sensor: This can be due to incorrect wiring or a faulty sensor. Double-check the connections and try using a different sensor.

• Check Connections: Verify that all connections are correct and secure.
• Power Supply: Ensure the sensor is receiving the correct voltage (3.3V - 5.5V).
• Stabilization Time: Allow the sensor to stabilize for a few seconds after powering up before taking readings.
• Library Compatibility: Ensure you are using a compatible library for the DHT11 sensor (e.g., the DHT library for Arduino).

By following this documentation, users should be able to effectively integrate and utilize the KY-015 DHT11 Temperature-Humidity Sensor Module in their projects.