Read the room

/*
  02 — Read the room
  Board: ESP32.  Parts: DHT11, breadboard, jumper wires.
  Library: "DHT sensor library" by Adafruit (+ Adafruit Unified Sensor).

  Wiring (DHT11 module, 3 pins): VCC -> 3V3, GND -> GND, DATA -> GPIO 4.
  The kit includes the DHT11 sensor module, so connect its three module pins directly as shown.

  The sensor needs ~2 s between readings and about a minute to settle after
  power-up; readings that drift at first are normal, not a fault.
*/

#include "DHT.h"

const int DHT_PIN = 4;
DHT dht(DHT_PIN, DHT11);

void setup() {
  Serial.begin(115200);
  dht.begin();
  Serial.println("DHT11 warming up...");
}

void loop() {
  delay(2000);                                 // DHT11 minimum sample interval
  float h = dht.readHumidity();
  float t = dht.readTemperature();             // Celsius
  if (isnan(h) || isnan(t)) {
    Serial.println("Read failed - check DATA pin and power, then wait 2 s");
    return;
  }
  Serial.print("Temperature: "); Serial.print(t, 1); Serial.print(" C   ");
  Serial.print("Humidity: ");    Serial.print(h, 0); Serial.println(" %");
}