DHT11 Temperature & Humidity

Wire it up

Disconnect power before changing connections. Follow terminal names rather than wire colors.

The complete sketch

#include <DHT.h>
DHT sensor(2, DHT11);
void setup() { Serial.begin(9600); sensor.begin(); }
void loop() {
  float temperature = sensor.readTemperature();
  float humidity = sensor.readHumidity();
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Read failed");
  } else {
    Serial.print("temperature:"); Serial.print(temperature);
    Serial.print(" humidity:"); Serial.println(humidity);
  }
  delay(2000);
}

The launch buttons use this same code and a matching saved circuit.

Build it step by step

1. Open a complete project

   Launch in Simulator creates a separate Uno sketch and its matching wired circuit. Existing sketches are preserved. Press Run to compile and execute.

2. Explore the live circuit

   Run for at least two seconds, open simulated serial output, and change the sensor temperature or humidity.

3. Try it on hardware

   Disconnect power while wiring. Match terminal names in the table, select the exact board, Verify, then connect and upload. Check component ratings and power requirements first.

Understand the sketch