Adafruit DHT11/DHT22 Temp/Humidity

Name: Adafruit DHT11/DHT22 Temp/Humidity
Brand: Adafruit
Availability: InStock

AdafruitTrinket M0

Simple wiring for DHT sensors with power, data, and ground connections.

Manufacturer guide / datasheet

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Specifications

Operating Voltage: 3 to 5V (recommended: 5V) for DHT11, sometimes 3.3V is not enough for DHT22 and AM2302 with 3.3V logic.
Logic Level: 3.3V or 5V (depending on sensor type)

Pinout

Pin	Name	Functions	Notes
1	POWER	POWER	5V recommended
2	DATA	GPIOPWM	Pullup resistor required for DHT11
3	GND	GND
4	GND	GND

Interactive pinout

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Trinket M0

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Starter code

Community starter examples — minimal, unofficial, and provided to get you wiring fast. Verify against the manufacturer datasheet before relying on them.

Arduino (C++)

Arduino library: DHT sensor library (Adafruit) (+ Adafruit Unified Sensor)

arduino

// DHT11/DHT22 temperature + humidity — community starter example
#include <DHT.h>

#if defined(ESP32)
  #define DHTPIN 4       // ESP32: GPIO4
#else
  #define DHTPIN 2       // Uno: D2
#endif
#define DHTTYPE DHT22    // use DHT11 for the blue 3-pin module

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
}

void loop() {
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  if (isnan(t) || isnan(h)) {
    Serial.println("DHT read failed");
  } else {
    Serial.print("T="); Serial.print(t); Serial.print(" C  RH="); Serial.print(h); Serial.println(" %");
  }
  delay(2000);   // DHT22 sampling is ~0.5 Hz
}

MicroPython

python

# DHT22 (ESP32) — community starter example
# uses the built-in `dht` module (no install needed)
from machine import Pin
import dht, time

sensor = dht.DHT22(Pin(4))   # DHT11 -> dht.DHT11; data on GPIO4

while True:
    sensor.measure()
    print(sensor.temperature(), "C", sensor.humidity(), "%")
    time.sleep(2)

Wiring

Pin	Arduino Uno R3	ESP32 DevKitC (WROOM-32)	Notes
Pin 1 (VCC)	+5V	5V	DHT22 is most reliable at 5 V
Pin 2 (DATA)	D2	GPIO4	Add a 10 kohm pull-up from DATA to VCC
Pin 4 (GND)	GND	GND

Typical uses

Room temperature + humidity monitoring
Greenhouse, HVAC, and weather logging