Wiring
Check pinout, power supply, common GND and voltage levels before connecting the module.
Full code
#include <DHT.h>
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(115200);
dht.begin();
}
void loop() {
Serial.println(dht.readTemperature());
Serial.println(dht.readHumidity());
delay(2000);
}How it works
This lesson matches the page title and gives a clean starting point for this exact example.
Common mistakes
Check board selection, wiring, libraries, power supply and serial monitor baud rate.