DHT22 with Raspberry Pi Pico W

Wiring for the DHT22 (AM2302) temperature + humidity on the Raspberry Pi Pico W (RP2040, 3.3 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

DHT22 pin	Role	Raspberry Pi Pico W pin	Notes
VCC	Power	3V3(OUT)
DATA	One-wire data	GP15	Needs a 10 kΩ pull-up (included on 3-pin modules)
GND	Ground	GND

Check before you power it on

Supply: 3.3 V from the 3V3(OUT) pin.

Test code (Arduino)

// Library: DHT sensor library (Adafruit)
#include <DHT.h>

DHT dht(15, DHT22);

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

void loop() {
  delay(2000);  // the DHT22 needs 2 s between readings
  Serial.print(dht.readTemperature());
  Serial.print(" C  ");
  Serial.print(dht.readHumidity());
  Serial.println(" %");
}

Arduino board: rp2040:rp2040:rpipicow. If the board is not found, hold the BOOTSEL button while plugging in the USB cable.

Questions

Which Raspberry Pi Pico W pins do I use for the DHT22?

VCC → 3V3(OUT), DATA → GP15, GND → GND.

Does the DHT22 work with the Raspberry Pi Pico W at 3.3 V?

Yes: the DHT22 runs at 3.3-5 V and the Raspberry Pi Pico W uses 3.3 V signals, so no level shifting is needed.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Raspberry Pi Pico W pinout · DHT22 (AM2302) temperature + humidity: all pins and data

The DHT22 on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico Teensy 4.1

Other parts on the Raspberry Pi Pico W

BME280 BMP280 DHT11 HC-SR04 SSD1306 OLED MPU6050 DS18B20 WS2812B LED strip SG90 servo Relay module HC-SR501 PIR LCD 1602 I2C INA219 VL53L0X BH1750 MAX30102 RC522 RFID NEO-6M GPS Capacitive soil moisture sensor ADS1115 TM1637 28BYJ-48 stepper L298N Potentiometer Push button LED Joystick module SD card module AHT20