keyestudio Humidity temperature Module

1. Introduction

This tutorial explains how to use a DHT11 Temperature and Humidity Sensor Module. You will learn how to measure ambient temperature and humidity levels using the sensor.

2.Specifications

Parameter	Description
Operating Voltage	DC5V
Control Method	Arduino digital pin (D0-D13)
Dimensions	Length：31.5 mm Width：23.5 mm

3.Required Materials

• Arduino Uno （Compatible with ESP32, STM32, Raspberry Pi, and others）

• keyestudio Light Sensor (LDR) Module

• Jumper wires

4.Wiring Instructions（Arduino UNO R3)

Humidity temperature Module Pin	Arduino Pin
VCC	5V
GND	GND
S	D3（or other digital pins）

5.Sample Code

Temperature and humidity readings

Read the ambient temperature and humidity and display them in the serial monitor.

#include "DHT.h"

#define DHTPIN 3          // Define the pin where the DHT11 data line is connected
#define DHTTYPE DHT11     // Define the type of DHT sensor used

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);   // Initialize serial communication at 9600 baud rate
  dht.begin();          // Initialize the DHT sensor
  Serial.println("DHT11 sensor test");
}

void loop() {
  // Read humidity (percentage)
  float humidity = dht.readHumidity();
  // Read temperature in Celsius
  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!");
  } else {
    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.print(" %\t");
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" *C");
  }

  delay(2000);  // Wait a few seconds between measurements
}

Experimental phenomena：

• After uploading the code to your Arduino and opening the Serial Monitor (set to 9600 baud rate), the Arduino will start reading data from the DHT11 sensor.

• Every approximately 2 seconds, the Serial Monitor will print the current humidity and temperature readings from the sensor.