9. DHT11 Temperature and Humidity Sensor

This tutorial will help you learn how ouse the temperature and humidity sensor.

Materials

Component	Image
Breadboard
Jumper wires
Arduino Uno R4 Minima
DHT11 Temperature and Humidity Sensor

Instructions

1. Make the following connections to using the dreadboard and jumper wires.

Connections

• Vcc to 5V
• Signal to pin 2
• Gnd to GND

2. Download the DHT sensor library by Adafruit on the Arduino library manager.

3. Make sure that the DHT.h file is within the same directory as you main Arduino sketch.

4. In your main Arduino sketch, paste the following code:

Code

#include <DHT.h>
#define DHT_SENSOR_PIN 2
#define DHT_SENSOR_TYPE DHT11

DHT dht_sensor(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);

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

void loop() {
  float temperature = dht_sensor.readTemperature();
  float humidity = dht_sensor.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  delay(2000); // Wait for 2 seconds before reading again
}

5. Upload your code to your arduino using a USB-C cable and run it.

6. Test! Open the serial monitor and watch the temperature and humidity vary depending on nearby objects!

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8. Membrane Switch Module	10. Analog Joystick