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The KY015 is a temperature and humidity module for Arduino and other microcontroller projects
KY-015 module has a DHT11digital temperature and humidity sensor and a resistor. The DHT11 uses a thermistor for the temperature sensing and a capacitive humidity sensor along with an internal IC to give a digital output for both temperature and humidity.
Voltage : 3.3 to 5VDC
Humidity range : 20% to 90% @ 5% RH accuracy
Temperature range : 0C to 50C at 2C accuracy
Size 30x15mm
Here is an example project to measure temperature and humidity using the KY015 module and an Arduino Uno
Temperature and Humidity Sensor
In this project, we will be building a weather station that can measure both temperature and humidity.
This is what you will need:
Components
Arduino Uno x 1 or Arduino Nano x 1
Libraries
Adafruit Unified Sensor Library
First you will nedd to assemble the project. Connect everything together using the wiring diagram bellow for reference.
Connect the KY-015 sensor module to the Arduino
Ground - - - - - - - - - - Ground
Vcc - - - - - - - - - - - - - - 3v3
Data - - - - - - - - - - - - - A0
A 10KΩ pull-up resistor is built in to the KY-015
Connect your Arduino to the PC and install the above Libraries. If you don’t know how to do this, CLICK HERE and follow the “Installing Arduino Libraries” section.
We can now create the code to get this all working
First, delete the code in the IDE window, then include the aforementioned libraries:
#include "DHT.h" This bit of code imports the DHT library and links it to the sketch.
#define DHTPIN A0
#define DHTTYPE DHT11 This bit of code defines which pin is KY015 connected to and sets the type of sensor (KY015 uses DHT11)
DHT dht(DHTPIN, DHTTYPE); This bit of code initialises the sensor
void setup() {
Serial.begin(115200);
Serial.println(F("DHT11 test!"));
dht.begin();
} The setup bit of code initialises serial output with baud rate of 115200 and prints DHT11 test! In the console
void loop() {
delay(2000); This bit makes the Arduino wait 2 seconds between measurements
float h = dht.readHumidity(); Read humidity from the sensor
float t = dht.readTemperature(); Read temperature from the sensor
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.println(F("°C "));
} Print the latest reading in serial monitor
Finished Code:
#include "DHT.h"
#define DHTPIN A0 // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11 // DHT 11
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(115200);
Serial.println(F("DHT11 test!"));
dht.begin();
}
void loop() {
delay(2000);
float h = dht.readHumidity();
float t = dht.readTemperature();
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.println(F("°C "));
}
